Accurate temperature control type ion nitriding furnace

Abstract

The invention discloses a precise temperature control type ion nitriding furnace which comprises an ion nitriding furnace body and has the beneficial effects that an outer limiting block, an outer limiting sliding groove, a first gear and a second gear are arranged, so that when the second gear rotates, the meshed first gear is driven to rotate; when a first gear rotates, an outer limiting sliding groove and an outer rotating cylinder are driven to rotate through an outer limiting block on the inner side, the outer rotating cylinder rotates on the outer side of an inner thread adjusting column, the outer rotating cylinder drives a material disc to rotate through a supporting base, and a workpiece is flexibly adjusted on the material disc according to the nitriding requirement; according to the ion nitriding furnace, the exhaust fan sucks gas in the ion nitriding furnace body into the ventilation cavity through the exhaust box, the gas is heated through the electric heating wire in the ventilation cavity, the heated gas is sucked into the ion nitriding furnace body through the air outlet box, the gas is heated, and the temperature in the ion nitriding furnace body is increased.

Description

Technical Field

[0001] The invention relates to the technical field of ion nitriding furnaces, and in particular to a precise temperature-controlled ion nitriding furnace. Background Art

[0002] Ion nitriding furnace is a kind of equipment that uses nitrogen-containing rarefied gas to ionize in a DC electric field in a vacuum container, and forms a nitride layer on the surface of metal parts by bombarding the metal parts with positive ions to achieve surface hardening. The working principle of ion nitriding furnace is mainly to use the workpiece as cathode and the furnace body as anode. When the vacuum degree in the furnace is pumped to a certain level (such as 101Pa), ammonia is filled to make the pressure of the vacuum chamber reach an appropriate range (such as 66.651333.2Pa). At the same time, a certain DC current (such as voltage 400750V, current density 0.52.0mA / cm 2 ), at this time, high-energy nitrogen ions will bombard the surface of the workpiece, converting it from kinetic energy to thermal energy to heat the workpiece. Under the action of the high-voltage electric field, glow discharge will occur, and ammonia will be partially decomposed to form positive ions, nitrogen and hydrogen electrons. Nitrogen ions absorb electrons and reduce them to atoms. These atoms are absorbed by the surface of the workpiece and diffuse into the inner layer, combining with the sputtered iron ions to form iron nitride (FeN). FeN will reattach to the surface of the workpiece and then decompose, and nitrogen atoms will diffuse into the workpiece to form a nitride layer. The ion nitriding furnace is mainly composed of a furnace body, a power transmission device, a vacuum acquisition system, a power supply system, a gas supply system and a temperature measurement system. However, in the current design of ion nitriding furnaces, the tray is often fixed at a fixed position and angle, and the workpiece cannot be flexibly adjusted on the fixed tray according to the nitriding requirements. Due to the limited contact area and angle between the workpiece surface and the nitriding ions, the nitriding process is not uniform, which affects the final hardening quality. Summary of the invention

[0003] The object of the present invention is to provide a precise temperature-controlled ion nitriding furnace to solve the problem raised in the above background technology that in the current ion nitriding furnace design, the material tray is often fixed at a fixed position and angle, and the workpiece cannot be flexibly adjusted on the fixed material tray according to the nitriding requirements. Since the contact area and angle between the workpiece surface and the nitriding ions are limited, the nitriding process is not uniform enough, which affects the final hardening quality.

[0004] To achieve the above-mentioned purpose, the present invention provides the following technical solutions: a precise temperature-controlled ion nitriding furnace, comprising an ion nitriding furnace body, a furnace cover is arranged on the top of the ion nitriding furnace body, an adjusting screw is rotatably connected inside the ion nitriding furnace body, an outer side of the adjusting screw is threadedly connected to an inner threaded adjusting column, an outer side of the inner threaded adjusting column is rotatably connected to an outer rotating cylinder, a No. 1 gear is slidably connected to the outer side of the outer rotating cylinder, the No. 1 gear is rotatably connected to the ion nitriding furnace body, a No. 2 gear is rotatably connected to the internal rotation of the ion nitriding furnace body, a No. 2 motor is installed inside the ion nitriding furnace body, an output end of the No. 2 motor is fixedly connected to the No. 2 gear, the No. 2 gear is meshed with the No. 1 gear, the outer rotating cylinder is movably connected to the ion nitriding furnace body, the top of the outer rotating cylinder is fixedly connected to a support seat, the top of the support seat A material tray is fixedly connected, a spiral coolant pipe is fixedly connected inside the ion nitriding furnace body, both ends of the spiral coolant pipe are fixedly connected with coolant pipes, the coolant pipe is fixedly connected to the ion nitriding furnace body, an exhaust box is symmetrically fixedly connected inside the ion nitriding furnace body, a ventilation cavity is symmetrically opened inside the ion nitriding furnace body, an exhaust fan is symmetrically installed inside the ion nitriding furnace body, the input end of the exhaust fan is connected to the exhaust box through an air duct, the output end of the exhaust fan is connected to the ventilation cavity through the air duct, a plurality of electric heating wires are equidistantly installed inside the ventilation cavity, an outlet box is symmetrically fixedly connected to the inner side of the ion nitriding furnace body, a connecting air box is symmetrically fixedly connected inside the ion nitriding furnace body, the connecting air box and the outlet box are communicated through a connecting air duct, and the ventilation cavity and the connecting air box are connected through an air duct.

[0005] As a preferred solution of the present invention: a supporting top frame is fixedly connected to the outer side of the ion nitriding furnace body, a hydraulic cylinder is installed on the top of the supporting top frame, an output end of the hydraulic cylinder is fixedly connected to a connecting frame, the bottom of the connecting frame is fixedly connected to the furnace cover, the top of the connecting frame is symmetrically fixedly connected to a limiting slide rod, and the limiting slide rod is slidably connected to the supporting top frame.

[0006] As a preferred solution of the present invention: four outer limit slots are equidistantly provided on the outer side of the outer rotating cylinder, four outer limit blocks cooperating with the outer limit slots are equidistantly fixedly connected to the inner side of the No. 1 gear, and the outer limit blocks are slidably connected to the outer limit slots.

[0007] As a preferred solution of the present invention: a limiting slide is symmetrically fixedly connected to the outer side of the internal thread adjustment column, the limiting slide is slidably connected to the ion nitriding furnace body, the limiting slide is internally slidably connected to a limiting rod, and the limiting rod is fixedly connected to the ion nitriding furnace body.

[0008] As a preferred solution of the present invention: an air inlet fan is installed at the bottom of the ion nitriding furnace body, the output end of the air inlet fan is connected to the ion nitriding furnace body through an air duct, and the input end of the air inlet fan is fixedly connected to a filter mesh tube.

[0009] As a preferred solution of the present invention: a nitrogen inlet pipe is fixedly connected to the interior of the furnace cover, and an air outlet pipe is fixedly connected to the interior of the furnace cover.

[0010] As a preferred solution of the present invention: a vacuum tube is fixedly connected to the interior of the furnace cover.

[0011] As a preferred solution of the present invention: solenoid valves are installed on the coolant pipe, the nitrogen inlet pipe and the air outlet pipe.

[0012] As a preferred solution of the present invention: a bottom sealing cylinder matched with the ion nitriding furnace body is fixedly connected to the bottom of the furnace cover.

[0013] As a preferred solution of the present invention: a No. 1 motor is installed at the bottom of the ion nitriding furnace body, the output end of the No. 1 motor is fixedly connected to the adjusting screw, and a thermocouple is symmetrically installed on the outer side of the support seat.

[0014] Compared with the prior art, the beneficial effects of the present invention are as follows: the present invention realizes that when the No. 2 gear rotates, the meshing No. 1 gear is driven to rotate by the arrangement of an outer limit block, an outer limit slot, a No. 1 gear and a No. 2 gear; when the No. 1 gear rotates, the outer limit slot and the outer rotating cylinder are driven to rotate by the inner outer limit block; the outer rotating cylinder rotates on the outside of the inner threaded adjustment column; the outer rotating cylinder drives the material tray to rotate through the support seat; the workpiece is flexibly adjusted on the material tray according to the nitriding requirements; by arranging an exhaust box, a ventilation cavity and an electric heating wire, the exhaust fan draws the gas in the ion nitriding furnace body into the ventilation cavity through the exhaust box, heats it through the electric heating wire in the ventilation cavity, and then draws it into the ion nitriding furnace body through the air outlet box after heating, heats the gas, and increases the temperature inside the ion nitriding furnace body. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Figure 1 It is a schematic diagram of the internal structure of the present invention;

[0016] Figure 2 For the present invention Figure 1 Enlarged view of point A in the middle;

[0017] Figure 3 For the present invention Figure 1 Enlarged view of point B in the middle;

[0018] Figure 4 For the present invention Figure 1 Enlarged view of point C in the middle;

[0019] Figure 5 It is a top view of the outer limiting slide groove of the present invention.

[0020] In the figure: 1. Ion nitriding furnace body; 2. Support top frame; 3. Hydraulic cylinder; 4. Connecting frame; 5. Furnace cover; 6. Nitrogen inlet pipe; 7. Air outlet pipe; 8. Solenoid valve; 9. No. 1 motor; 10. Adjusting screw rod; 11. Internal thread adjusting column; 12. External rotating cylinder; 13. External limit slide; 14. External limit block; 15. No. 1 gear; 16. No. 2 gear; 17. No. 2 motor; 18. Limit slide plate ; 19. Limit rod; 20. Vacuum box; 21. Exhaust fan; 22. Ventilation chamber; 23. Electric heating wire; 24. Continuous ventilation box; 25. Continuous ventilation duct; 26. Air outlet box; 27. Spiral coolant pipe; 28. Bottom sealing cylinder; 29. ​​Air inlet fan; 30. Filter mesh pipe; 31. Limit slide rod; 32. Material tray; 33. Thermocouple; 34. Support seat; 35. Coolant pipe; 36. Vacuum tube. DETAILED DESCRIPTION

[0021] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0022] See also Figures 1 to 5The present invention provides a technical solution: a precise temperature-controlled ion nitriding furnace, comprising an ion nitriding furnace body 1, a furnace cover 5 is arranged on the top of the ion nitriding furnace body 1, an adjusting screw rod 10 is rotatably connected inside the ion nitriding furnace body 1, an inner thread adjusting column 11 is threadedly connected to the outer side of the adjusting screw rod 10, an outer rotating cylinder 12 is rotatably connected to the outer side of the inner thread adjusting column 11, a No. 1 gear 15 is slidably connected to the outer side of the outer rotating cylinder 12, the No. 1 gear 15 is rotatably connected to the ion nitriding furnace body 1, and the inner part of the ion nitriding furnace body 1 is rotatably connected to the inner part of the ion nitriding furnace body 1. The outer rotating cylinder 12 is movably connected to the ion nitriding furnace body 1, and the top of the outer rotating cylinder 12 is fixedly connected to the support seat 34, and the top of the support seat 34 is fixedly connected to the material tray 32, and the interior of the ion nitriding furnace body 1 is fixedly connected to the spiral coolant pipe 27, and both ends of the spiral coolant pipe 27 are fixedly connected to the coolant pipe 32. The cooling liquid pipe 35 is fixedly connected to the ion nitriding furnace body 1, and the inside of the ion nitriding furnace body 1 is symmetrically fixedly connected with the exhaust box 20, and the inside of the ion nitriding furnace body 1 is symmetrically provided with a ventilation cavity 22, and the inside of the ion nitriding furnace body 1 is symmetrically installed with an exhaust fan 21, and the input end of the exhaust fan 21 is connected to the exhaust box 20 through an air duct, and the output end of the exhaust fan 21 is connected to the ventilation cavity 22 through an air duct, and a plurality of electric heating wires 23 are equidistantly installed inside the ventilation cavity 22, and the inner side of the ion nitriding furnace body 1 is symmetrically fixed. An air outlet box 26 is connected, and a connecting air box 24 is symmetrically fixedly connected inside the ion nitriding furnace body 1. The connecting air box 24 and the air outlet box 26 are connected through a connecting air duct 25, and the ventilation cavity 22 and the connecting air box 24 are connected through an air duct. The electric heating wire 23 heats the gas in the ventilation cavity 22, and after heating, the gas enters the connecting air box 24 through the air duct. The hot air in the connecting air box 24 enters the connecting air duct 25 through the connecting air duct 25, and enters the ion nitriding furnace body 1 through the air outlet box 26, so as to heat the gas.

[0023] Among them, the outer side of the ion nitriding furnace body 1 is fixedly connected with a supporting top frame 2, a hydraulic cylinder 3 is installed on the top of the supporting top frame 2, the output end of the hydraulic cylinder 3 is fixedly connected with a connecting frame 4, the bottom of the connecting frame 4 is fixedly connected to the furnace cover 5, and the top of the connecting frame 4 is symmetrically fixedly connected with a limiting slide bar 31, the limiting slide bar 31 is slidably connected to the supporting top frame 2, and the connecting frame 4 and the furnace cover 5 are driven by the output end of the hydraulic cylinder 3 to adjust up and down, so as to facilitate the material taking and placing of the workpiece in the ion nitriding furnace body 1.

[0024] Among them, four outer limit slots 13 are equidistantly provided on the outer side of the outer rotating cylinder 12, and four outer limit blocks 14 cooperating with the outer limit slots 13 are equidistantly fixedly connected to the inner side of the No. 1 gear 15. The outer limit blocks 14 are slidably connected to the outer limit slots 13, and when the No. 1 gear 15 rotates, the inner outer limit blocks 14 are driven to rotate synchronously, and the outer limit blocks 14 and the outer limit slots 13 drive the outer rotating cylinder 12 to rotate, thereby driving the support seat 34 and the material tray 32 to complete the rotation through the outer rotating cylinder 12, and adjusting the rotation angle of the workpiece.

[0025] Among them, the outer side of the internal thread adjustment column 11 is symmetrically fixedly connected with a limiting slide 18, the limiting slide 18 is slidably connected to the ion nitriding furnace body 1, the internal sliding connection of the limiting slide 18 is a limiting rod 19, the limiting rod 19 is fixedly connected to the ion nitriding furnace body 1, when the internal thread adjustment column 11 moves, it drives the limiting slides 18 on both sides to move, and the limiting slide 18 slides within the limit rod 19, thereby improving the height adjustment stability of the internal thread adjustment column 11 and the outer rotating cylinder 12.

[0026] Among them, an air inlet fan 29 is installed at the bottom of the ion nitriding furnace body 1, the output end of the air inlet fan 29 is connected to the ion nitriding furnace body 1 through an air duct, and the input end of the air inlet fan 29 is fixedly connected to a filter mesh tube 30, and the gas entering the air inlet fan 29 is filtered through the filter mesh tube 30.

[0027] Among them, the interior of the furnace cover 5 is fixedly connected with a nitrogen inlet pipe 6, and the interior of the furnace cover 5 is fixedly connected with an air outlet pipe 7. Nitrogen is input into the ion nitriding furnace body 1 through the nitrogen inlet pipe 6, and the high-temperature gas in the ion nitriding furnace body 1 is discharged through the air outlet pipe 7.

[0028] The interior of the furnace cover 5 is fixedly connected with a vacuum tube 36 , and the vacuum treatment in the ion nitriding furnace body 1 is completed through the vacuum tube 36 .

[0029] The cooling liquid pipe 35 , the nitrogen inlet pipe 6 and the air outlet pipe 7 are all equipped with electromagnetic valves 8 , and the cooling liquid pipe 35 , the nitrogen inlet pipe 6 and the air outlet pipe 7 are connected and controlled by the electromagnetic valves 8 .

[0030] Among them, the bottom of the furnace cover 5 is fixedly connected with a bottom sealing cylinder 28 that cooperates with the ion nitriding furnace body 1. The bottom sealing cylinder 28 at the bottom of the furnace cover 5 is sealed with the ion nitriding furnace body 1 to seal the space inside the ion nitriding furnace body 1.

[0031] Among them, a No. 1 motor 9 is installed at the bottom of the ion nitriding furnace body 1, the output end of the No. 1 motor 9 is fixedly connected to the adjusting screw 10, and a thermocouple 33 is symmetrically installed on the outer side of the support seat 34, and the thermocouple 33 detects and processes the temperature inside the ion nitriding furnace body 1.

[0032] Specifically, when in use, the device is controlled by an external controller, and the device is powered on by an external power supply. The output end of the hydraulic cylinder 3 drives the connecting frame 4 and the furnace cover 5 to move upward, and the output end of the No. 1 motor 9 drives the adjusting screw 10 to rotate. When the adjusting screw 10 rotates, it drives the outer internal threaded adjusting column 11 to adjust the height position. When the internal threaded adjusting column 11 adjusts the height, it drives the outer rotating cylinder 12, the support seat 34 and the material tray 32 to adjust the height position. The outer rotating cylinder 12 simultaneously drives the outer limit slide 13 to move the height position. The outer limit slide 13 and the outer limit block 14 limit sliding, so that the workpiece can be placed in the material tray 32, and then the height can be adjusted downward. Reset, drive the connecting frame 4 and the furnace cover 5 downward through the output end of the hydraulic cylinder 3, seal the ion nitriding furnace body 1, connect the vacuum pumping equipment to the vacuum pumping tube 36 for vacuum pumping, and introduce nitrogen into the ion nitriding furnace body 1 through the nitrogen inlet pipe 6 after vacuum pumping. A certain direct current is applied between the two electrodes inside the ion nitriding furnace body 1. High-energy nitrogen ions will bombard the surface of the workpiece, converting it from kinetic energy to thermal energy to heat the workpiece. Under the action of the high-voltage electric field, glow discharge will be generated, and ammonia will be partially decomposed to form positive ions, nitrogen and hydrogen electrons. Nitrogen ions absorb electrons and reduce them to atoms. These atoms are absorbed by the surface of the workpiece and diffuse to the inner layer, and react with the sputtered iron. The ions combine to form iron nitride FeN, which will reattach to the surface of the workpiece and then decompose, and the nitrogen atoms will diffuse into the workpiece to form a nitride layer. At the same time, the output end of the No. 2 motor 17 drives the No. 2 gear 16 to rotate. When the No. 2 gear 16 rotates, it drives the meshing No. 1 gear 15 to rotate. When the No. 1 gear 15 rotates, it drives the outer limit slide 13 and the outer rotating cylinder 12 to rotate through the inner outer limit block 14. The outer rotating cylinder 12 rotates on the outside of the inner threaded adjustment column 11. When the outer rotating cylinder 12 rotates, it drives the support seat 34 and the material tray 32 to rotate and adjust. After rotating one circle, it resets. The material tray 32 adjusts the reciprocating position of the workpiece to fully carry out the nitriding treatment. The input end of the exhaust fan 21 exhausts air from the ion nitriding furnace body 1 through the exhaust box 20, enters the ventilation cavity 22, and heats the gas through the electric heating wire 23, and enters the outlet box 26 through the connecting air duct 25 connected between the connecting air box 24 and the outlet box 26, to heat the gas and increase the temperature in the ion nitriding furnace body 1. When cooling is required after completion, coolant is introduced into the spiral coolant pipe 27 to cool the ion nitriding furnace body 1. At the same time, the outlet pipe 7 is opened, and air is blown into the ion nitriding furnace body 1 through the air inlet fan 29, and the gas in the ion nitriding furnace body 1 is collected and discharged through the outlet pipe 7, so that the ion nitriding furnace body 1 is quickly exhausted and cooled.

[0033] In the description of the present invention, it is necessary to understand that the terms "coaxial", "bottom", "one end", "top", "middle", "the other end", "upper", "one side", "top", "inside", "front", "center", "both ends" and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as a limitation on the present invention.

[0034] In addition, the terms "first", "second", "third" and "fourth" are used for descriptive purposes only and are not to be understood as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, the features defined as "first", "second", "third" and "fourth" may explicitly or implicitly include at least one of such features.

[0035] In the present invention, unless otherwise clearly stipulated and limited, the terms such as "installation", "setting", "connection", "fixation" and "screw-on" should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integral one; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium; it can be the internal connection of two elements or the interaction relationship between two elements. Unless otherwise clearly defined, ordinary technicians in this field can understand the specific meanings of the above terms in the present invention according to the specific circumstances.

[0036] Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the present invention, and that the scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. A precise temperature-controlled ion nitriding furnace, comprising an ion nitriding furnace body (1), characterized in that: The top of the ion nitriding furnace body (1) is provided with a furnace cover (5), the inside of the ion nitriding furnace body (1) is rotatably connected to an adjusting screw rod (10), the outer side of the adjusting screw rod (10) is threadedly connected to an internal threaded adjusting column (11), the outer side of the internal threaded adjusting column (11) is rotatably connected to an outer rotating cylinder (12), the outer side of the outer rotating cylinder (12) is slidably connected to a first gear (15), the first gear (15) is rotatably connected to the ion nitriding furnace body (1), and the inner rotating cylinder (1) of the ion nitriding furnace body (1) is rotatably connected to the inner rotating cylinder (1). A second gear (16) is connected, a second motor (17) is installed inside the ion nitriding furnace body (1), the output end of the second motor (17) is fixedly connected to the second gear (16), the second gear (16) is meshingly connected to the first gear (15), the outer rotating cylinder (12) is movably connected to the ion nitriding furnace body (1), the top of the outer rotating cylinder (12) is fixedly connected to a support seat (34), the top of the support seat (34) is fixedly connected to a material tray (32), the inside of the ion nitriding furnace body (1) A spiral cooling liquid pipe (27) is fixedly connected, and both ends of the spiral cooling liquid pipe (27) are fixedly connected to cooling liquid pipes (35), and the cooling liquid pipe (35) is fixedly connected to the ion nitriding furnace body (1), and the interior of the ion nitriding furnace body (1) is symmetrically fixedly connected to an exhaust box (20), and the interior of the ion nitriding furnace body (1) is symmetrically provided with a ventilation cavity (22), and the interior of the ion nitriding furnace body (1) is symmetrically installed with an exhaust fan (21), and the input end of the exhaust fan (21) is connected to the exhaust box (20) through a wind The ion nitriding furnace body (1) is connected to the ion nitriding furnace body (1), the output end of the exhaust fan (21) is connected to the ventilation cavity (22) through an air duct, a plurality of electric heating wires (23) are equidistantly installed inside the ventilation cavity (22), an air outlet box (26) is symmetrically fixedly connected to the inner side of the ion nitriding furnace body (1), a connecting air box (24) is symmetrically fixedly connected to the inner side of the ion nitriding furnace body (1), the connecting air box (24) and the air outlet box (26) are connected through a connecting air duct (25), and the ventilation cavity (22) and the connecting air box (24) are connected through an air duct.

2. The precise temperature-controlled ion nitriding furnace according to claim 1, characterized in that: The outer side of the ion nitriding furnace body (1) is fixedly connected to a support top frame (2), a hydraulic cylinder (3) is installed on the top of the support top frame (2), the output end of the hydraulic cylinder (3) is fixedly connected to a connecting frame (4), the bottom of the connecting frame (4) is fixedly connected to a furnace cover (5), and the top of the connecting frame (4) is symmetrically fixedly connected to a limit slide bar (31), and the limit slide bar (31) is slidably connected to the support top frame (2).

3. The precise temperature-controlled ion nitriding furnace according to claim 2, characterized in that: Four outer limit slots (13) are equidistantly formed on the outer side of the outer rotating cylinder (12); four outer limit blocks (14) cooperating with the outer limit slots (13) are equidistantly fixedly connected to the inner side of the first gear (15); the outer limit blocks (14) are slidably connected to the outer limit slots (13).

4. The precise temperature-controlled ion nitriding furnace according to claim 3, characterized in that: A limiting slide plate (18) is symmetrically and fixedly connected to the outer side of the internal thread adjustment column (11), and the limiting slide plate (18) is slidably connected to the ion nitriding furnace body (1). The limiting slide plate (18) is internally slidably connected to a limiting rod (19), and the limiting rod (19) is fixedly connected to the ion nitriding furnace body (1).

5. The precise temperature-controlled ion nitriding furnace according to claim 4, characterized in that: An air inlet fan (29) is installed at the bottom of the ion nitriding furnace body (1); the output end of the air inlet fan (29) is connected to the ion nitriding furnace body (1) via an air duct; and the input end of the air inlet fan (29) is fixedly connected to a filter mesh tube (30).

6. The precise temperature-controlled ion nitriding furnace according to claim 5, characterized in that: The interior of the furnace cover (5) is fixedly connected to a nitrogen inlet pipe (6), and the interior of the furnace cover (5) is fixedly connected to an air outlet pipe (7).

7. The precise temperature-controlled ion nitriding furnace according to claim 6, characterized in that: A vacuum tube (36) is fixedly connected to the interior of the furnace cover (5).

8. The precise temperature-controlled ion nitriding furnace according to claim 7, characterized in that: The cooling liquid pipe (35), the nitrogen inlet pipe (6) and the air outlet pipe (7) are all equipped with electromagnetic valves (8).

9. The precise temperature-controlled ion nitriding furnace according to claim 8, characterized in that: The bottom of the furnace cover (5) is fixedly connected to a bottom sealing cylinder (28) that cooperates with the ion nitriding furnace body (1).

10. The precise temperature-controlled ion nitriding furnace according to claim 9, characterized in that: A No. 1 motor (9) is installed at the bottom of the ion nitriding furnace body (1), the output end of the No. 1 motor (9) is fixedly connected to the adjusting screw rod (10), and a thermocouple (33) is symmetrically installed on the outer side of the support seat (34).

Images