Energy-saving and environment-friendly super-long and high-capacity ion nitriding method and equipment thereof

Abstract

The application discloses an energy-saving and environment-friendly super-long and large-capacity ion nitriding method and equipment thereof. The energy-saving and environment-friendly super-long and large-capacity ion nitriding equipment is developed and applied to a screw rod. Nitriding treatment is carried out by using ionized nitrogen-containing gas according to the principle of glow discharge. The working environment is very clean and no special equipment is needed to prevent public hazards. The nitriding speed is fast, only 1 / 3-1 / 5 of the time of ordinary gas nitriding. The workpiece is directly heated by using glow discharge, so that uniform temperature distribution can be obtained, and the energy consumption is only 40-70% of that of gas nitriding. The ion nitriding can be carried out from 380 DEG C, the treatment is carried out at low temperature, and the deformation of the treated workpiece is extremely small. The gas consumption is extremely small, and the treatment cost can be greatly reduced.

Description

Technical Field

[0001] This invention belongs to the field of nitriding equipment technology, specifically relating to an energy-saving and environmentally friendly ultra-long capacity ion nitriding method and equipment. Background Technology

[0002] Existing patent CN220503159U describes a stainless steel anti-corrosion ion nitriding furnace. The user rotates a motor to drive a bidirectional threaded rod, which in turn moves two threaded sleeves and two sliding sleeves, thereby moving four connecting rods and raising a support plate. When the plate reaches the furnace opening, stainless steel components are placed on it. Then, the motor rotates in the opposite direction, causing the support plate to descend. The retraction of two hydraulic rods then closes the furnace lid onto the furnace body, and a sealing ring ensures a tight seal. The sealing ring is also secured within a groove for improved internal sealing and to prevent leakage. A vacuum pump then evacuates the furnace to a vacuum state. Finally, [the process is repeated in the original text]. An air pump adds an appropriate amount of nitrogen into the furnace body. Then, by applying an anode voltage to the furnace body and a cathode voltage to the stainless steel components, nitriding and corrosion protection are performed on the internal stainless steel components. The internal pressure can be observed through the observation window and pressure gauge for easy control. When the stainless steel workpiece is nitrided and needs to be removed, the extension of the hydraulic rod drives the furnace cover to detach from the furnace body. Then, the rotation of the motor drives the support plate to rise to the furnace opening, where the stainless steel component can be removed quickly and easily. At the same time, the through holes opened on the support plate allow all surfaces of the stainless steel component to come into contact with nitrogen, resulting in a more uniform and rapid reaction.

[0003] The patent has an electric lifting mechanism, but the electric lifting mechanism has a complex structure and poor lifting stability. In addition, the nitriding furnace cannot shorten the ion nitriding time during the nitriding operation, it is not convenient to stir the nitrogen gas evenly and is not suitable for ultra-long-capacity ion nitriding, resulting in poor nitriding effect.

[0004] Meanwhile, the commonly used gas nitriding heat treatment requires endothermic gas at 560℃ and takes 3-90 hours depending on the workpiece material and diffusion layer requirements. The cycle is long, the surface has brittle phases, and a finishing process is generally required (the machining allowance is very small, usually 1 to 2 microns). In addition, soot is easily generated in the furnace, which poses an explosion risk when mixed with air. Furthermore, trace amounts of toxic gases are easily generated, and white ammonium carbonate compounds are produced in the mixing tube of ammonia and endothermic gas, which can cause defects such as blockage of the tube passage. Summary of the Invention

[0005] The purpose of this invention is to provide an energy-saving and environmentally friendly ultra-long capacity ion nitriding method and equipment to solve the problems mentioned in the background art.

[0006] The present invention provides the following technical solution: an energy-saving and environmentally friendly ultra-long capacity ion nitriding method, step one, pretreatment: the workpiece needs to be thoroughly cleaned before ion nitriding to remove oil, rust, etc., and then polished or ground.

[0007] Step 2, loading the furnace: The pretreated workpiece is placed into the vacuum container of the ion nitriding furnace, which is equipped with a cathode and an anode.

[0008] Step 3, Vacuuming: Start the vacuum pump to extract the air from the furnace, and the vacuum level is between 10^-1 Pa and 10^0 Pa;

[0009] Step 4, gas filling: A certain proportion of inert gases such as nitrogen and argon are filled into the furnace, with nitrogen accounting for 80%-100% and the remainder being argon or other inert gases. The gas pressure is 20-200 Pa, which is used to create an atmosphere suitable for glow discharge.

[0010] Step 5, glow discharge: Apply a DC high voltage between the anode and cathode to cause glow discharge of the gas. The glow discharge voltage is between 400-1000 V and the current density is between 1-10 mA / cm². The charged particles (such as nitrogen ions) generated by the glow discharge collide with the workpiece surface at high speed, causing the workpiece surface temperature to rise.

[0011] Step Six, Heating and Nitriding: During glow discharge, the surface temperature of the workpiece gradually increases. Low-temperature nitriding is between 400°C and 525°C, requiring 20 to 50 hours; medium-temperature nitriding is between 525°C and 600°C, requiring 10 to 30 hours; and high-temperature nitriding is between 525°C and 600°C, requiring 5 to 20 hours. Nitrogen ions are absorbed by the workpiece surface at high temperatures and penetrate into the workpiece surface layer to form a nitrided layer.

[0012] Step 7, Maintenance and Monitoring: During the nitriding process, it is necessary to maintain a constant temperature and atmosphere, and monitor the nitriding process to ensure that the quality and thickness of the nitrided layer meet the requirements.

[0013] Step 8, Cooling: After nitriding is completed, turn off the power and gas supply, and allow the workpiece to cool naturally or be forcibly cooled to room temperature in the furnace;

[0014] Step 9, Post-processing: The nitrided workpiece needs to undergo stress relief treatment or other post-processing procedures to improve its performance.

[0015] An energy-saving and environmentally friendly ultra-long capacity ion nitriding equipment includes a base plate, a furnace body fixedly connected to the upper surface of the base plate, two hydraulic rods fixedly connected to the upper surface of the base plate, the two hydraulic rods being symmetrically distributed on both sides of the furnace body, a furnace cover fixedly connected to the top of the two hydraulic rods, a vacuum pump installed on the lower surface of the furnace cover, a vacuum pipe connected to the outlet of the vacuum pump extending to the outside of the furnace cover, a vacuum pipe connected to the inlet of the vacuum pump, a gas pump installed on the upper surface of the furnace cover, a gas filling pipe connected to the outlet of the gas pump extending through to the lower surface of the furnace cover, a gas filling pipe connected to the inlet of the gas pump, a pressure gauge installed on the outer wall of the furnace body, and an observation window on the side of the furnace body located near the pressure gauge; the equipment is characterized by further including an electric lifting mechanism and a nitrogen stirring mechanism;

[0016] The furnace body has an inner cavity, and a partition cavity is formed between the inner cavity and the furnace body. A support block is provided on the bottom surface of the inner cavity to support the partition cavity, and a bottom cavity is formed between the support blocks.

[0017] The electric lifting mechanism is installed in the partition. The electric lifting mechanism includes a motor with a drive shaft, a threaded lifting rod, and a lifting plate. The threaded lifting rod includes a first threaded lifting rod and a second threaded lifting rod. The motor is located on one side of the partition and the drive shaft is coupled to the first threaded lifting rod. The first threaded lifting rod is connected to the second threaded lifting rod on the other side of the partition by a belt passing through the bottom cavity via a pulley. The lifting plate is screwed to the first threaded lifting rod and the second threaded lifting rod respectively by threaded parts at both ends.

[0018] The nitrogen stirring mechanism is installed on the furnace cover. The nitrogen stirring mechanism includes a stirring motor with an output shaft and nitrogen stirring blades. The output shaft of the stirring motor is coupled to a connecting shaft, and the nitrogen stirring blades are installed on the connecting shaft.

[0019] The base plate has a power supply cavity, in which a power module is installed. The front of the power supply cavity is provided with a first knob and a second knob for electrical connection to the motor and the stirring motor, respectively. The first knob and the second knob are respectively electrically connected to the power module. On the front of the power supply cavity and to the right of the first knob and the second knob, there is also a power interface for electrical connection to the power module.

[0020] Preferably, the top surface of the cavity is sealed, and shaft tubes are respectively provided on the top surface of one side of the cavity and the top and bottom surfaces of the other side of the cavity.

[0021] Preferably, the inner cavity has longitudinally movable openings on both sides.

[0022] Preferably, the top surface of the first threaded lifting rod and the top and bottom surfaces of the second threaded lifting rod are each provided with a shaft portion on which ball bearings are installed, and these shaft portions are respectively axially connected inside the shaft tube.

[0023] Preferably, the lifting plate has multiple rows of ventilation holes, and the left and right sides of the lifting plate are connected by connecting columns passing through the longitudinal movement port and the screw connection.

[0024] Preferably, the nitrogen stirring blade includes a sleeve fitted onto the connecting shaft and stirring blades disposed on the outer wall of the sleeve.

[0025] Preferably, the top surface of the partition cavity is provided with a raised edge, and the furnace cover has a groove along the furnace opening, in which a sealing strip is embedded, and the two sides of the groove are fixed on the raised edge.

[0026] The beneficial effects of this invention are: compared with traditional gas nitriding, glow discharge ion nitriding technology has several advantages, such as shorter nitriding cycle, smaller workpiece deformation, energy saving, and reduced ammonia consumption. Therefore, this method has been rapidly developed and applied in many fields, especially when processing metallic materials requiring wear resistance, fatigue resistance, and corrosion resistance.

[0027] The electric lifting mechanism employs a motor installed within the diaphragm chamber that drives a first threaded lifting rod. A belt, connected to a pulley, drives a second threaded lifting rod on the other side of the diaphragm chamber. This allows the threaded connection to move a lifting plate connected to a connecting column within the diaphragm chamber. A nitriding stirring mechanism installed on the furnace cover facilitates the electric-driven nitrogen stirring blades to uniformly stir the nitrogen within the furnace, reducing the time required for ultra-large capacity ion nitriding and ensuring a uniform nitriding effect. The electric lifting mechanism and nitriding stirring mechanism are easily operated and controlled via first and second knobs on the base plate, resulting in energy savings, environmental friendliness, and improved efficiency for ultra-large capacity ion nitriding. Attached Figure Description

[0028] Figure 1 This is a schematic diagram of the structure of the present invention;

[0029] Figure 2 This is a schematic diagram of the furnace body structure;

[0030] Figure 3 This is a schematic diagram of the electric lifting mechanism.

[0031] Figure 4 This is a schematic diagram of the first threaded lifting rod structure;

[0032] Figure 5 This is a schematic diagram of the lifting platform structure;

[0033] Figure 6 This is a schematic diagram of the furnace lid structure;

[0034] Figure 7 This is a schematic diagram of the nitrogen stirring mechanism.

[0035] In the diagram: base plate 1, power supply chamber 11, power module 12, first knob 13, second knob 14, power interface 15, hydraulic rod 16, furnace cover 2, vacuum pump 21, exhaust pipe 22, inlet pipe 23, gas pump 24, gas pipe 25, gas filling pipe 26, observation window 27, pressure gauge 28, furnace body 3, inner cavity 31, partition 32, raised edge 33, groove 34, bottom cavity 36, longitudinal movement port 37, electric lifting mechanism 4, motor 41, first threaded lifting rod 42, second threaded lifting rod 43, pulley 44, belt 45, shaft 46, shaft tube 47, lifting plate 49, vent hole 50, connecting column 51, threaded part 52, nitrogen stirring mechanism 6, stirring motor 61, connecting shaft 62, nitrogen stirring blade 63, sleeve 64, stirring blade 65. Detailed Implementation

[0036] 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.

[0037] The technical solution provided by this invention is: an energy-saving and environmentally friendly ultra-long capacity ion nitriding method. Step 1, pretreatment: the workpiece needs to be thoroughly cleaned before ion nitriding to remove oil, rust, etc., and then polished or ground.

[0038] Step 2, loading the furnace: The pretreated workpiece is placed into the vacuum container of the ion nitriding furnace, which is equipped with a cathode and an anode.

[0039] Step 3, Vacuuming: Start the vacuum pump to extract the air from the furnace, and the vacuum level is between 10^-1 Pa and 10^0 Pa;

[0040] Step 4, gas filling: A certain proportion of inert gases such as nitrogen and argon are filled into the furnace, with nitrogen accounting for 80%-100% and the remainder being argon or other inert gases. The gas pressure is 20-200 Pa, which is used to create an atmosphere suitable for glow discharge.

[0041] Step 5, glow discharge: Apply a DC high voltage between the anode and cathode to cause glow discharge of the gas. The glow discharge voltage is between 400-1000 V and the current density is between 1-10 mA / cm². The charged particles (such as nitrogen ions) generated by the glow discharge collide with the workpiece surface at high speed, causing the workpiece surface temperature to rise.

[0042] Step Six, Heating and Nitriding: During glow discharge, the surface temperature of the workpiece gradually increases. Low-temperature nitriding is between 400°C and 525°C, requiring 20 to 50 hours; medium-temperature nitriding is between 525°C and 600°C, requiring 10 to 30 hours; and high-temperature nitriding is between 525°C and 600°C, requiring 5 to 20 hours. Nitrogen ions are absorbed by the workpiece surface at high temperatures and penetrate into the workpiece surface layer to form a nitrided layer.

[0043] Step 7, Maintenance and Monitoring: During the nitriding process, it is necessary to maintain a constant temperature and atmosphere, and monitor the nitriding process to ensure that the quality and thickness of the nitrided layer meet the requirements.

[0044] Step 8, Cooling: After nitriding is completed, turn off the power and gas supply, and allow the workpiece to cool naturally or be forcibly cooled to room temperature in the furnace;

[0045] Step 9, Post-processing: The nitrided workpiece needs to undergo stress relief treatment or other post-processing procedures to improve its performance.

[0046] We have developed an energy-saving and environmentally friendly ultra-long capacity ion nitriding equipment for screw extrusion. Utilizing the glow discharge principle, it employs ionized nitrogen-containing gas for nitriding, resulting in a very clean working environment without the need for special pollution prevention equipment. The nitriding speed is fast, only 1 / 3 to 1 / 5 the time of ordinary gas nitriding. Direct heating of the workpiece using glow discharge achieves a uniform temperature distribution, with energy consumption only 40-70% of that of gas nitriding. Ion nitriding can be performed from 380℃ onwards, minimizing workpiece deformation even at low temperatures. Gas consumption is extremely low (only 1 / 3 to 1 / 5 of gas nitriding), significantly reducing processing costs.

[0047] Please see Figure 1-7The technical solution provided by this invention is as follows: An energy-saving and environmentally friendly ultra-long capacity ion nitriding equipment, comprising a base plate 1, a furnace body 3 fixedly connected to the upper surface of the base plate 1, two hydraulic rods 16 fixedly connected to the upper surface of the base plate 1, the two hydraulic rods 16 being symmetrically distributed on both sides of the furnace body 3, a furnace cover 2 fixedly connected to the top of the two hydraulic rods 16, a vacuum pump 21 provided on the lower surface of the furnace cover 2, an outlet pipe 22 connected to the outlet end of the vacuum pump 21, the outlet pipe 22 extending to the outside of the furnace cover 2, and an inlet pipe connected to the inlet end of the vacuum pump 21. A gas pipe 23 facilitates the evacuation of the furnace body 3 to a vacuum state, enabling nitriding. An air pump 24 is installed on the upper surface of the furnace cover 2, with its outlet connected to an air supply pipe 25 extending through to the lower surface of the furnace cover 2. An air inlet of the air pump 24 is connected to an air filling pipe 26, facilitating the addition of nitrogen gas to the furnace body 3 for nitriding. A pressure gauge 28 is installed on the outer wall of the furnace body 3, and an observation window 27 is located on the side of the pressure gauge 28 for easy monitoring of the internal pressure. This technical structure has been disclosed in existing patents; please refer to those patents.

[0048] While existing patents in the background art feature electric lifting mechanisms, these mechanisms are complex and lack smoothness. Furthermore, these nitriding furnaces cannot shorten the ion nitriding time during nitriding operations, hinder uniform nitrogen mixing, and are unsuitable for ultra-long-capacity ion nitriding, resulting in suboptimal nitriding performance. This application improves upon existing patents by refining the lifting structure, along with improvements to the base plate and internal furnace structure. It also adds a nitrogen mixing mechanism suitable for ultra-long-capacity ion nitriding, shortening the nitriding time and improving nitriding efficiency through uniform nitrogen mixing.

[0049] Specifically, this application also includes an electric lifting mechanism and a nitrogen stirring mechanism;

[0050] Based on the improvements to the two structures mentioned above, the furnace body structure in this application is as follows: An inner cavity 31 is formed within the furnace body 3, and a partition cavity 32 is formed between the inner cavity 31 and the furnace body 3. Support blocks supporting the partition cavity 32 are provided on the bottom surface of the inner cavity 31; in this embodiment, two blocks are provided, one at the front and one at the back, forming a bottom cavity 36 between the support blocks. A raised edge 33 is provided on the top surface of the partition cavity 32, and a groove 34 is formed along the furnace opening of the furnace cover 2. A sealing strip (not shown in the figure) is embedded in the groove 34, and the two sides of the groove 34 are fixed to the raised edge 33. This ensures that the furnace cover 2 seals onto the furnace body 3, increasing the sealing effect.

[0051] The specific structure of the electric lifting mechanism in this embodiment is as follows:

[0052] The electric lifting mechanism 4 is installed inside the partition 32. The electric lifting mechanism 4 includes a motor 41 with a drive shaft, threaded lifting rods, and a lifting plate 49. The threaded lifting rods include a first threaded lifting rod 42 and a second threaded lifting rod 43 arranged opposite each other. The motor 41 is located on one side of the partition 32, and its drive shaft is coupled to the first threaded lifting rod 42. The motor model is not an innovation of this application and can be used flexibly. The first threaded lifting rod 42 is connected to the second threaded lifting rod 43 on the other side of the partition 32 via a fixedly installed pulley 44, a belt 45 passing through the bottom cavity 36 and a connecting shaft 62, thus connecting the two threaded lifting rods for rotation. The lifting plate 49 is threaded at both ends 52 and screwed into the first and second threaded lifting rods 43 respectively. The lifting plate 49 has multiple rows of ventilation holes 50 arranged through it, and the left and right sides of the lifting plate 49 are connected by connecting posts 51 passing through longitudinal movement openings 37 and threaded connections 52. The top surface of the partition 32 is sealed, and shaft tubes 47 are respectively provided on the top surface of one side of the partition 32, the top surface of the other side of the partition 32, and the bottom surface. The first and second threaded lifting rods 43 are respectively used for shaft connection. Longitudinal movement openings 37 are provided on both sides of the inner cavity 31. Connecting posts 51 on both sides of the lifting plate 49 pass through the longitudinal movement openings 37 and connect to the threaded portion 52, facilitating the screw connection and lifting of the first and second threaded lifting rods 43. The top surface of the first threaded lifting rod 42 and the top and bottom surfaces of the second threaded lifting rod 43 are each provided with a shaft portion 46 equipped with ball bearings, which are respectively shafted within the shaft tube 47. This facilitates separate shaft rotation. In this embodiment, the threads of the first and second threaded lifting rods 43 are arranged in a spiral direction from left to right. Therefore, clockwise rotation causes the screw connection to move downwards, and counterclockwise rotation causes it to move upwards, thereby achieving the lifting and lowering of the lifting plate 49.

[0053] In this embodiment, a nitrogen stirring mechanism is added as follows:

[0054] The nitrogen stirring mechanism 6 is mounted on the furnace cover 2. The nitrogen stirring mechanism 6 includes a stirring motor 61 with an output shaft and nitrogen stirring blades 63. The output shaft of the stirring motor 61 is coupled to a connecting shaft 62, and the nitrogen stirring blades 63 are mounted on the connecting shaft 62. The length of the connecting shaft 62 is designed not to affect the rising of the lifting plate 49, as the furnace cover 2 needs to be opened after the lifting plate 49 rises. The nitrogen stirring blades 63 include a sleeve 64 fitted onto the connecting shaft 62 and stirring blades 65 disposed on the outer wall of the sleeve 64. This design is suitable for ultra-long capacity ion nitriding, shortening the nitriding time and improving the uniformity of nitriding.

[0055] Both the motor 4 and the stirring motor 61 require electrical connection. Therefore, the base plate 1 has a power supply cavity 11, in which a power module 12 is installed. The power module 12 can be a lithium battery or a storage battery. The front of the power supply cavity 11 has a first knob 13 and a second knob 14 for electrical connection to the motor 4 and the stirring motor 61, respectively. The motor 4 is electrically connected to the first knob 13 via a connecting wire passing through the power supply cavity 11. The stirring motor 61 is electrically connected to the second knob 14 via a motor connecting wire passing through the rear end of the power supply cavity 11. The connecting wires are shown in the figure. The first and second knobs 14 are electrically connected to the power module 12, respectively. A power interface 15 for electrical connection to the power module 12 is also provided on the front of the power supply cavity 11, to the right of the first and second knobs 14. The working principle is simple and can be understood with general electrical knowledge. Rotating the first knob and / or the second knob provides power, enabling the operation of the motor and the stirring motor.

[0056] The working principle of this application is as follows: When in operation, the user rotates the first knob, which drives the motor to rotate the first threaded lifting rod. The first threaded lifting rod passes through the installed pulley and the belt passes through the bottom cavity to connect the shaft to the second threaded lifting rod, thereby driving the threaded part together. The threaded part passes through the longitudinal movement port opened in the inner cavity through the connecting post and is screwed to the first and second threaded lifting rods, thereby driving the support plate to rise or fall.

[0057] When the furnace reaches the opening position, the stainless steel components are placed on the support plate. Then, the motor rotates in the reverse direction, causing the support plate to descend. The retraction of two hydraulic rods then closes the furnace lid onto the furnace body, and a sealing ring secures the lid in place. The grooves on both sides engage with the raised edges, increasing sealing and preventing leakage. Next, a vacuum pump evacuates the furnace body, and a nitrogen pump adds an appropriate amount of nitrogen gas. An anodic voltage is applied to the furnace body, and a cathodic voltage is applied to the stainless steel components, thus performing nitriding corrosion protection. An electric stirring mechanism is added to ensure uniform nitrogen dispersion. The internal pressure can be monitored through an observation window and pressure gauge for easy control.

[0058] When the stainless steel workpiece needs to be removed after nitriding, the extension of the hydraulic rod causes the furnace cover to detach from the furnace body. The motor raises the first lifting threaded rod, which in turn drives the second lifting threaded rod, causing the support plate to rise to the position of the furnace opening. The stainless steel parts can then be removed quickly and easily. At the same time, the vent holes on the support plate allow all surfaces of the stainless steel parts to come into contact with nitrogen gas, making the process more uniform and faster.

[0059] Although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art can still modify the technical solutions described in the foregoing embodiments or make equivalent substitutions for some of the technical features. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the protection scope of the present invention.

Claims

1. An energy-saving and environmentally friendly ultra-long capacity ion nitriding equipment, comprising a base plate, a furnace body fixedly connected to the upper surface of the base plate, two hydraulic rods fixedly connected to the upper surface of the base plate, the two hydraulic rods being symmetrically distributed on both sides of the furnace body, a furnace cover fixedly connected to the top of the two hydraulic rods, a vacuum pump installed on the lower surface of the furnace cover, an outlet pipe connected to the outlet end of the vacuum pump extending to the outside of the furnace cover, an inlet pipe connected to the inlet end of the vacuum pump, a gas pump installed on the upper surface of the furnace cover, a gas filling pipe connected to the outlet of the gas pump extending through to the lower surface of the furnace cover, a gas charging pipe connected to the inlet of the gas pump, a pressure gauge installed on the outer wall of the furnace body, and an observation window located on the side of the furnace body near the pressure gauge; characterized in that: It also includes an electric lifting mechanism and a nitrogen stirring mechanism; The furnace body has an inner cavity, and a partition cavity is formed between the inner cavity and the furnace body. A support block is provided on the bottom surface of the inner cavity to support the partition cavity, and a bottom cavity is formed between the support blocks. The electric lifting mechanism is installed inside the partition. The electric lifting mechanism includes a motor with a drive shaft, a threaded lifting rod, and a lifting plate. The threaded lifting rod includes a first threaded lifting rod and a second threaded lifting rod. The motor is located on one side of the partition, and the drive shaft is coupled to the first threaded lifting rod. The first threaded lifting rod is connected to the second threaded lifting rod on the other side of the partition via a belt passing through the bottom cavity and a pulley. The lifting plate is threaded at both ends and screwed into the first and second threaded lifting rods respectively. The lifting plate has multiple rows of ventilation holes arranged through it, and the left and right sides of the lifting plate are connected by connecting columns passing through longitudinal movement ports and threaded connections. The nitrogen stirring mechanism is installed on the furnace cover. The nitrogen stirring mechanism includes a stirring motor with an output shaft and nitrogen stirring blades. The output shaft of the stirring motor is coupled to a connecting shaft, and the nitrogen stirring blades are installed on the connecting shaft. The base plate has a power supply cavity, in which a power module is installed. The front of the power supply cavity is provided with a first knob and a second knob for electrical connection to the motor and the stirring motor, respectively. The first knob and the second knob are respectively electrically connected to the power module. On the front of the power supply cavity and to the right of the first knob and the second knob, there is also a power interface for electrical connection to the power module.

2. An energy-saving and environmentally friendly ultra-long capacity ion nitriding method using the ion nitriding equipment of claim 1, characterized in that: Includes the following steps: Step 1, Pretreatment: Before ion nitriding, the workpiece needs to be thoroughly cleaned to remove oil, rust, etc., and then polished or ground. Step 2, loading the furnace: The pretreated workpiece is placed into the vacuum container of the ion nitriding furnace, which is equipped with a cathode and an anode. Step 3, Vacuuming: Start the vacuum pump to extract the air from the furnace, and the vacuum level is between 10^-1 Pa and 10^0 Pa; Step 4, gas filling: A certain proportion of inert gases such as nitrogen and argon are filled into the furnace, with nitrogen accounting for 80%-100% and the remainder being argon or other inert gases. The gas pressure is 20-200 Pa, which is used to create an atmosphere suitable for glow discharge. Step 5, glow discharge: Apply a DC high voltage between the anode and cathode to cause glow discharge of the gas. The glow discharge voltage is between 400-1000 V and the current density is between 1-10 mA / cm². The charged particles (such as nitrogen ions) generated by the glow discharge collide with the workpiece surface at high speed, causing the workpiece surface temperature to rise. Step Six, Heating and Nitriding: During glow discharge, the surface temperature of the workpiece gradually increases. Low-temperature nitriding is between 400°C and 525°C, requiring 20 to 50 hours; medium-temperature nitriding is between 525°C and 600°C, requiring 10 to 30 hours; and high-temperature nitriding is between 525°C and 600°C, requiring 5 to 20 hours. Nitrogen ions are absorbed by the workpiece surface at high temperatures and penetrate into the workpiece surface layer to form a nitrided layer. Step 7, Maintenance and Monitoring: During the nitriding process, it is necessary to maintain a constant temperature and atmosphere, and monitor the nitriding process to ensure that the quality and thickness of the nitrided layer meet the requirements. Step 8, Cooling: After nitriding is completed, turn off the power and gas supply, and allow the workpiece to cool naturally or be forcibly cooled to room temperature in the furnace; Step 9, Post-processing: The nitrided workpiece needs to undergo stress relief treatment or other post-processing procedures to improve its performance.

3. The energy-saving and environmentally friendly ultra-long capacity ion nitriding equipment according to claim 1, characterized in that: The top surface of the diaphragm is sealed, and shaft tubes are respectively provided on the top surface of one side of the diaphragm, the top surface of the other side of the diaphragm, and the bottom surface.

4. The energy-saving and environmentally friendly ultra-long capacity ion nitriding equipment according to claim 1, characterized in that: The inner cavity has longitudinally movable openings on both sides.

5. The energy-saving and environmentally friendly ultra-long capacity ion nitriding equipment according to claim 1, characterized in that: The top surface of the first threaded lifting rod and the top and bottom surfaces of the second threaded lifting rod are each provided with a shaft portion on which ball bearings are installed, which are respectively axially connected inside the shaft tube.

6. The energy-saving and environmentally friendly ultra-long capacity ion nitriding equipment according to claim 1, characterized in that: The nitrogen stirring blade includes a sleeve fitted onto the connecting shaft and stirring blades disposed on the outer wall of the sleeve.

7. The energy-saving and environmentally friendly ultra-long capacity ion nitriding equipment according to claim 1, characterized in that: The top surface of the partition cavity is provided with a raised edge, and the furnace cover has a groove along the furnace opening. A sealing strip is embedded in the groove, and the two sides of the groove are fixed by the raised edge.

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