Horizontal solid solution nitriding furnace

Abstract

The utility model provides a horizontal solid solution nitriding furnace which is characterized in that a furnace body is of a horizontal structure, an opening is formed in the side surface of the furnace body, and a slot leading to the inside of the furnace is formed in the top of the furnace body; the heating body is inserted into the furnace body from a top slot of the furnace body; the whole furnace tank is fixed in the furnace body from an opening in the side face of the furnace body, makes contact with the heating body and is heated through the heating body; the furnace cover is mounted on the side surface of the furnace body and is hermetically connected with the opening of the furnace tank; the material frame is arranged in the furnace tank, and a to-be-nitrided workpiece is placed in the material frame; the vacuum system is installed on the furnace tank and vacuumizes the interior of the furnace tank. The nitrogen atmosphere system enters the furnace tank from the outside of the furnace body and conveys nitrogen into the furnace tank. The external heating mode is adopted, the structure is simple, the manufacturing cost is low, meanwhile, the horizontal structure is adopted, equipment installation and maintenance are easy and convenient, and the feeding and taking mode is simple and safe.

Description

Technical Field

[0001] The utility model provides a solid solution nitriding furnace with a horizontal structure, belonging to the technical field of heat treatment devices. Background Art

[0002] Solid solution nitriding furnaces can process metal workpieces. Under high temperature, high pressure and nitrogen environment, nitrogen decomposes into nitrogen atoms. Under the combined effect of the concentration difference between the nitrogen atmosphere and the stainless steel structure and the gas pressure, the nitrogen atoms dissolve into the stainless steel to form an austenite structure, thereby strengthening the metal workpiece. Existing solid solution nitriding furnaces are usually divided into horizontal structures and vertical structures. The horizontal structure usually has an opening set on the side, and the workpiece enters and exits the furnace body horizontally from the opening on the side; the vertical structure usually has an opening set on the top surface, and the workpiece enters and exits the furnace body vertically from the opening on the top surface. For horizontal solid solution nitriding furnaces, internal heating is generally adopted (the heating element is inside the tank body). This type of furnace has a complex structure, high cost, high maintenance requirements, and high repair costs. For vertical solid solution nitriding furnaces, external heating is generally adopted, that is, the heating element is outside the tank body. Although this type of furnace has a relatively simple structure and lower cost than a horizontal solid solution nitriding furnace, the vertical solid solution nitriding furnace is difficult to install and requires digging a pit foundation. At the same time, it is difficult to feed and remove materials, the temperature uniformity is poor, and the gas circulation cannot completely imitate the ideal laboratory state. Utility Model Content

[0003] The utility model solves the deficiencies in the prior art and provides a horizontal solid solution nitriding furnace, which adopts an external heating method, has a simple structure and low cost. At the same time, it adopts a horizontal structure, and the equipment installation and maintenance are simple and convenient, and the feeding and taking methods are simple and safe.

[0004] The technical solution adopted to achieve the above-mentioned purpose of the utility model is:

[0005] A horizontal solid solution nitriding furnace, comprising:

[0006] The furnace body is a horizontal structure as a whole, and an opening is arranged on the side of the furnace body. The furnace body comprises a furnace frame, a furnace shell and a furnace lining arranged in sequence from the outside to the inside, and a slot leading to the furnace is arranged on the top of the furnace body;

[0007] A heating body is inserted into the furnace body from the slot on the top of the furnace body and abuts against the inner wall of the furnace lining;

[0008] A furnace pot, which is inserted into the furnace body from the opening on the side of the furnace body as a whole, and the furnace pot is in contact with the heating body and is heated by the heating body;

[0009] A furnace cover, installed at the opening on the side of the furnace body, used to open or close the opening;

[0010] A material frame, arranged inside the furnace tank, for placing the workpiece to be nitrided;

[0011] A vacuum system, installed on the furnace tank, for evacuating the interior of the furnace tank;

[0012] The nitrogen atmosphere system enters the furnace tank from the outside of the furnace body and is used to transport nitrogen into the furnace tank.

[0013] Furthermore, it also includes a nitrogen circulation system installed on the furnace cover, which is used to circulate the nitrogen inside the furnace tank.

[0014] Furthermore, the nitrogen circulation system includes a vacuum sealing motor, an air supply device, a water cooling device, a sealing device and a bracket, which are fixed on the furnace cover through the bracket. The air supply device is driven by the vacuum sealing motor and supplies air into the furnace tank. The water cooling device is installed on the vacuum sealing motor and is used to cool the vacuum sealing motor. The sealing device is installed between the bracket and the furnace cover to seal the gap between the two.

[0015] Furthermore, the furnace frame includes door posts and trusses, wherein the door posts are located at the opening of the furnace body and are connected to the trusses.

[0016] Furthermore, the heating body includes a plurality of U-shaped heating rods and a plurality of lead-out rods, and the U-shaped heating rods are distributed on the left and right inner walls and the rear inner wall of the furnace lining to form three heating areas; the plurality of lead-out rods are arranged on the top of the furnace body, the plurality of U-shaped heating rods are vertically installed in the furnace lining, and the plurality of lead-out rods are connected to each other through lines, and a protective cover for protecting the lead-out rods is provided on the top of the furnace body.

[0017] Furthermore, the furnace tank includes a furnace tank main structure, a water cooling jacket, an exhaust pipe and an external pipe socket; the water cooling jacket, the exhaust pipe and the external pipe socket are all arranged on the furnace tank main structure, the exhaust pipe is connected to the vacuum system, and the furnace tank main structure is sealed and connected to the furnace body.

[0018] Furthermore, the furnace cover includes a furnace cover main structure, a mounting seat, a furnace cover sealing device, an opening and closing mechanism, a clamping mechanism and a power-off protection switch. The mounting seat and the power-off protection switch are arranged on the furnace cover main structure. The furnace cover sealing device is a rotating chuck structure and is arranged between the furnace cover main structure and the furnace tank. The clamping mechanism includes two telescopic components. The telescopic ends of the two telescopic components are respectively connected to the radial ends of the furnace cover sealing device, and the telescopic directions of the two telescopic components are opposite and respectively perpendicular to the radial direction of the furnace cover sealing device; the opening and closing mechanism is installed and fixed on the side of the furnace body and connected to the furnace cover main structure, and is used to drive the furnace cover to open or close the opening.

[0019] Furthermore, a plurality of hangers for hanging the workpieces to be nitrided are arranged inside the material frame, a plurality of grooves are evenly arranged on the crossbeam of the material frame, and two ends of the hangers are movably connected in two oppositely arranged grooves.

[0020] Furthermore, a water cooling system is provided, which is connected to the water cooling device and the water cooling jacket and is used to cool the vacuum sealing motor and the furnace tank main structure.

[0021] Furthermore, the nitrogen atmosphere system includes a delivery pipe, an exhaust pipe, a safety valve and a furnace pressure control device, the safety valve and the furnace pressure control device are arranged on the delivery pipe, the delivery pipe is connected to the furnace body and leads to the interior of the furnace tank, the exhaust pipe includes a coil and a jet pipe, the coil is in a circular ring structure and is connected to the delivery pipe, a plurality of jet pipes are evenly arranged along the circumferential direction of the coil, the jet pipe extends to the interior of the furnace tank, a plurality of air outlet holes are evenly distributed on the jet pipe, and in the axial direction of the air outlet holes, the aperture of the air outlet holes gradually increases from the outside of the furnace tank to the inside of the furnace tank.

[0022] Compared with the prior art, the horizontal solid solution nitriding furnace provided by the utility model has the following advantages:

[0023] 1. The furnace body in this patent includes a furnace frame, a furnace shell and a furnace lining which are arranged in sequence from the outside to the inside. The furnace shell and the furnace lining form a double-layer structure, so that the furnace surface temperature rise is low, the thermal insulation and heat preservation are good, and the furnace frame adopts a high-strength truss structure to reduce the deflection and deformation of the furnace shell. Through the above design, the furnace body has the advantages of strong overall sealing performance, good thermal insulation performance, low heat capacity, low thermal conductivity, good thermal shock resistance, and long service life.

[0024] 2. This patent adopts a horizontal structure, and the furnace tank is fixed to the inside of the furnace body through the opening on the side of the furnace body. The furnace cover is installed on the side of the furnace body and is sealed with the opening of the furnace tank. With this horizontal structure, materials can be fed and taken out directly from the side of the furnace body. Compared with the existing method of feeding and taking out materials from the top, it has the advantages of simple and safe feeding and taking out materials.

[0025] 3. Traditional furnaces in this temperature range in the art generally use electric furnace wire or resistance belt heating. When replacing, the tank needs to be taken out and replaced as a whole, which will damage the insulation material, which is very troublesome. This patent solves this problem. In this patent, the heating body is inserted into the furnace body from the top slot of the furnace body and can be directly pulled out from the top of the furnace body, which can facilitate installation and maintenance, thereby reducing manufacturing and maintenance costs. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] Figure 1 The overall structural diagram of the horizontal solid solution nitriding furnace provided by this patent;

[0027] Figure 2 It is a structural cross-sectional view of the furnace body in this patent;

[0028] Figure 3 It is a schematic diagram of the structure of the furnace tank and the furnace cover in this patent;

[0029] Figure 4 for Figure 3 A cross-sectional view of

[0030] Figure 5 It is a structural schematic diagram of the furnace cover sealing device;

[0031] Figure 6 It is a structural schematic diagram of the material frame;

[0032] Figure 7 Schematic diagram of the structure of the nitrogen atmosphere system;

[0033] In the figure: 1-furnace body, 11-furnace frame, 111-doorpost, 112-truss, 12-furnace shell, 13-furnace lining, 2-heating body, 21-U-shaped heating element, 22-lead rod, 23-protective cover, 3-furnace tank, 31-furnace tank main structure, 311-tank body, 312-tank bottom, 313-tank top upper and lower pressure plates, 32-water cooling jacket, 33-exhaust pipe, 4-furnace cover, 41-furnace cover sealing device, 42-furnace cover main structure, 43-opening and closing mechanism, 44-pressing mechanism, 5-material frame, 51-hanging part, 52-nitriding workpiece, 53-crossbeam, 54-groove, 6-nitrogen atmosphere system, 61-conveying pipe, 62-coil, 63-injection pipe, 64-air outlet, 7-nitrogen circulation system, 71-vacuum sealing motor, 72-fan blade, 8-water cooling system. DETAILED DESCRIPTION

[0034] The present invention is described in detail below with reference to the accompanying drawings, but the protection scope of the present invention is not limited to the following embodiments.

[0035] This patent provides a horizontal solid solution nitriding furnace, the overall structure of which is as follows Figure 1 The components include:

[0036] The furnace body 1 is a horizontal structure as a whole. Figure 2 As shown, the side of the furnace body 1 is provided with an opening, and the furnace body 1 includes a furnace frame 11, a furnace shell 12 and a furnace lining 13 arranged in sequence from the outside to the inside, and a slot leading to the furnace is provided on the top of the furnace body 1. The furnace frame 11 is welded from steel and steel plates into a high-strength truss structure, including a door post 111 and a truss 112. The door post 111 is located at the opening of the furnace body 1 and is connected to the truss 112. Since it is a medium-high temperature furnace, the furnace frame 11 is welded from steel and steel plates into a high-strength truss structure to reduce its deflection and deformation. The design fully considers the influence of thermal expansion, considering that the furnace expands / contracts with the change of temperature when working. The steel structure of the furnace body 1 has an expansion / contraction function, and the furnace body 1 will not be deformed due to expansion / contraction under any circumstances. The thermal insulation and heat preservation of the furnace are fully considered in the design. In implementation, the welding of the steel plate will adopt airtight welding, and the outer shell adopts special protective measures to prevent rust, beautiful appearance, and reduce the radiation heat loss of the furnace shell.

[0037] The furnace lining 13 is one of the core components of the furnace. The furnace lining 13 of the furnace top and the furnace side are all made of full ceramic refractory fiber structure. The performance of this material is: light weight, good high temperature thermal stability, low thermal conductivity, small weight, small heat capacity, good shock resistance and chemical stability, good thermal insulation and heat preservation performance, and is a new type of furnace building material. The refractory ceramic fiber folding module used in this patent has low heat capacity, low thermal conductivity, excellent thermal stability, thermal shock resistance, excellent heat flow erosion resistance, and high mechanical strength. Excellent elasticity, because the fiber block maintains a certain amount of compression during production, after the masonry is completed, the fiber block expands itself and squeezes the furnace lining tightly without gaps, thereby improving the thermal insulation performance of the fiber furnace lining. Therefore, it has the advantages of strong overall sealing performance, good thermal insulation performance, low heat capacity, low thermal conductivity, excellent chemical stability, excellent thermal stability and thermal shock resistance, and long life. It is easy to install, quick, the anchor is built-in, and the safety performance is good.

[0038] Since this furnace is a medium-high temperature furnace with a rated furnace temperature of 1250℃, according to the working temperature requirements of the furnace, the ceramic fiber folding module uses a high-aluminum type. The inner lining of the furnace substrate is built with high-aluminum bricks, and the outer lining is a mixture of ceramic fiber blankets, silica adobe bricks and perlite. In order to enhance the thermal insulation performance of the furnace lining, it is built into a special structure.

[0039] The structure of the heating element 2 is as follows: Figure 1 and Figure 2 As shown in the figure, the heating body 2 is inserted into the furnace body 1 from the top slot of the furnace body 1 and abuts against the inner wall of the furnace lining 13; the heating body 2 is composed of a plurality of U-shaped heating elements 21, which are vertically installed in the furnace body 1 and connected to the lead-out rods 22 at the top through lines, and a protective cover 23 for protecting the lead-out rods 22 is provided on the top of the furnace body 1. The U-shaped heating element 21 is a silicon carbon rod, and the U-shaped heating rods 21 are distributed on the inner walls of the left and right sides and the inner wall of the rear side of the furnace lining 13 to form three heating areas, one of which is connected to the Y0 wiring and the other is temperature controlled. The U-shaped heating element 21 is the main component of the system. According to the long-term working furnace temperature of 1150°C, a silicon carbon rod electric heating element with good high temperature performance and relatively long service life is selected. It is a silicon carbide-based resistance heating element, which is heated to a high temperature in an oxidizing atmosphere, and a dense quartz glass film is formed on the surface to protect it from oxidation. Therefore, it has unique high-temperature oxidation resistance. In an oxidizing atmosphere, its maximum temperature can reach 1400℃, and its applicable temperature is 500-1300℃; the material is made into a U-shaped structure, which is installed vertically on both sides of the furnace top and behind the furnace to facilitate installation and maintenance; when designing the heating element, in addition to ensuring the furnace power, special attention should be paid to the service life of the element.

[0040] The structure of the furnace tank 3 is as follows Figure 3 and Figure 4 As shown, the whole is fixed to the inside of the furnace body 1 from the opening on the side of the furnace body 1, contacts with the heating body 2 and is heated by the heating body 2; the furnace tank 3 includes a furnace tank main structure 31, a water cooling jacket 32, an exhaust pipe 33, a pressure measuring pipe seat, and a venting pipe seat; the tank body 311, the tank bottom 312 and the upper and lower pressure plates 313 on the tank top are fixedly connected as a whole to form the furnace tank main structure 31, the cross section of the furnace tank 3 is circular, the water cooling jacket 32, the exhaust pipe 33, the pressure measuring pipe seat, and the venting pipe seat are all arranged on the furnace tank main structure 31, the exhaust pipe 33 is connected to the vacuum system, and a sealing structure is also arranged at the connection between the furnace tank main structure 31 and the furnace body 1, and the sealing structure adopts an "O" type sealing groove structure with a water jacket. The furnace tank 3 is a very important component for whether the furnace can realize solid solution nitriding. In order to ensure its anti-oxidation at high temperature and its strength under positive and negative pressures, this scheme adopts a circular cross section according to its working state, and selects 310S heat-resistant steel material to make the furnace tank main structure 31. Since the furnace tank 3 is placed in the heating chamber, it must maintain high high temperature strength and airtightness, and is integrally cast, with the thickest part reaching 20mm. The furnace tank of this structure has the characteristics of good high temperature airtightness, short vacuuming time, low air leakage rate, and long service life.

[0041] The structure of furnace cover 4 is as follows Figure 3 and Figure 4As shown, it is installed on the side of the furnace body 1 and is sealed and connected to the opening of the furnace tank 3. The opening / closing of the furnace cover 4 is controlled by the opening and closing mechanism 43. The furnace cover 4 includes a cover plate, a composite heat insulation screen, a thermocouple seat, a gas circulation device seat, a furnace cover sealing device 41, an opening and closing mechanism 43, a pressing mechanism 44 and a power-off protection switch. The cover plate and the composite heat insulation screen constitute the furnace cover main structure 42. The thermocouple seat, the gas circulation device seat and the power-off protection switch are arranged on the furnace cover main structure 42. The cover plate is provided with a sealing groove. The structure of the furnace cover sealing device 41 is as shown in FIG. Figure 5 As shown, it is arranged between the furnace cover 4 and the furnace tank 3, and adopts a rotary chuck type seal. The clamping mechanism 44 includes two telescopic components, and the telescopic ends of the two telescopic components are respectively connected to the radial ends of the furnace cover sealing device 41, and the telescopic directions of the two telescopic components are opposite and perpendicular to the radial direction of the furnace cover sealing device; when the two telescopic components are extended at the same time, the furnace cover sealing device 41 is pushed to rotate counterclockwise by a certain angle, and vice versa, when the two telescopic components are retracted at the same time, the furnace cover sealing device 41 is pulled to rotate clockwise by a certain angle. Since the furnace cover sealing device 41 adopts a rotary chuck type seal, it can achieve sealing and clamping under the rotation drive of the clamping mechanism 44, and the two telescopic components adopt electric push rods or cylinders. The opening and closing mechanism 43 is installed and fixed on the side of the furnace body 1 and connected to the furnace cover main structure 42 to control the overall opening / closing of the furnace cover 4. In this solution, the opening and closing mechanism 43 of the furnace cover 4 adopts a manual opening and closing method, and the pressing mechanism 44 adopts a mechatronic design, which can achieve automatic rotation and pressing sealing, and is provided with a rotation stroke double insurance limit mechanism to ensure safe operation. At the same time, a power-off protection switch is also provided, which automatically cuts off the power when the furnace door is opened.

[0042] The structure of the material frame 5 is as follows Figure 4 and Figure 6 As shown, it is arranged inside the furnace tank 3, and adopts a frame structure, and the interior is used to place the workpiece 52 to be nitrided; the material frame 5 is provided with a plurality of hangers 51 inside, and a plurality of grooves 54 are evenly arranged on the crossbeam 53 of the material frame 5, and the two ends of the hangers 51 are respectively movably connected in the two oppositely arranged grooves 54, and the position of the hangers 51 can be adjusted arbitrarily. The material frame is made of 310S heat-resistant steel material; the material frame adopts a combined structure, and is assembled according to the different specifications of the workpiece 52 to be nitrided. The use of this free combination material frame structure can place workpieces 52 to be nitrided of different sizes in a single frame form by changing the placement position of the hangers 51. In this way, the needs can be met without making different material frames and tooling, which greatly saves costs. Moreover, according to the different diameters of the workpieces, there is no need to change the size of the tank body to meet the production needs.

[0043] The vacuum system is installed on the furnace tank 3 to evacuate the interior of the furnace tank 3; it is composed of evacuation equipment, vacuum bellows, vacuum butterfly valve and vacuum measuring instrument, and adopts a single-stage vacuum system (4XZ type mechanical pump) scheme. The vacuum system adopts the conventional setting scheme in this field and will not be elaborated here.

[0044] The structure of the nitrogen atmosphere system 6 is as follows Figure 4 and Figure 7 As shown, nitrogen enters from the outside of the furnace body 1 into the furnace tank 3, and is transported to the inside of the furnace tank 3. The nitrogen atmosphere system is composed of a delivery pipe 61, an exhaust pipe, a safety valve, and a furnace pressure control device. The safety valve and the furnace pressure control device are arranged on the delivery pipe 61. The delivery pipe 61 enters from the furnace body 1 into the furnace tank 3. The exhaust pipe is connected to the delivery pipe 61. The exhaust pipe includes a coil 62 and an injection pipe 63. The coil 62 is an annular structure and is connected to the delivery pipe 61. A plurality of injection pipes 63 are evenly arranged along the circumferential direction of the coil 62. The injection pipe 63 extends to the inside of the furnace tank 3. A plurality of gas outlets 64 are evenly distributed on the injection pipe 63. In the axial direction of the gas outlet 64, the aperture of the gas outlet 64 gradually increases from the outside of the furnace tank 3 to the inside of the furnace tank 3. The specific arrangement of the jet pipe 63 can be gradually changed according to the test results. According to the process requirements of the test process, it is necessary to adjust the diameter, arrangement mode, size of the air outlet 64, distribution of the air outlet 64, etc. of the jet pipe 63, and finally change it into an air intake pipeline that meets the process requirements. The furnace pressure control device in this patent is composed of an air intake pipe, an exhaust pipe, a pressure reducing valve, a flow meter, a KPa small-range pressure gauge, a venting hand valve, a solenoid valve, a pressure switch, etc. According to the needs of nitriding, the solenoid valve is manually adjusted to control the flow rate, and the gas pressure and pressure display in the furnace can be automatically set and adjusted. A safety valve is also provided in the nitrogen atmosphere system 6. After the solenoid valve fails, the safety valve can realize automatic overpressure venting and pressure reduction, realizing double insurance for personnel and equipment safety.

[0045] Nitrogen circulation system 7 Figure 4As shown, it is installed on the furnace cover 4 and can circulate the nitrogen inside the furnace tank 3. The nitrogen circulation system 7 includes a vacuum sealing motor 71, a fan blade 72, a shaft, an air duct, a water cooling device, a sealing device and a bracket. The vacuum sealing motor 71 adopts frequency conversion control and is fixed on the furnace cover 4 through a bracket. The sealing device is installed between the bracket and the furnace cover 4 to seal the gap between the two; the fan blade 72 is installed on the shaft and driven by the vacuum sealing motor 71. The fan blade 72 rotates and draws air from the air duct. The water cooling device is installed on the vacuum sealing motor 71 to cool the vacuum sealing motor 71. The sealing device adopts a flange connection with a sealing groove. The nitrogen circulation system 7 is set to ensure uniform heating of the workpiece and uniform nitriding of the surface. The vacuum sealing motor 71 adopts frequency conversion control. The fan speed can be adjusted according to the test requirements to achieve the process indicators. The nitrogen circulation system 7 adopts a horizontal installation form and is installed on the furnace cover 4. The circulation method adopts the air duct exhaust form. This system can make the internal gas circulate fully and evenly, effectively reduce the use of atmosphere gas, and make the internal temperature more uniform.

[0046] The water cooling system 8 uses a circulating water supply method for cooling; the water cooling system 8 includes a water pump, a circulating water tank, a hand valve, a water supply pipe and a drainage pipe that are connected to each other. The water cooling system 8 is connected to the water cooling device and the water cooling jacket 32 ​​to cool the vacuum sealing motor 71 and the furnace tank main structure 31. The water cooling system adopts a conventional setting scheme in the field and will not be elaborated here.

Claims

1. A horizontal solid solution nitriding furnace, characterized in that: include: A furnace body (1) is a horizontal structure as a whole, an opening is arranged on the side of the furnace body (1), the furnace body (1) comprises a furnace frame (11), a furnace shell (12) and a furnace lining (13) arranged in sequence from the outside to the inside, and a slot leading to the furnace is arranged on the top of the furnace body (1); A heating body (2) is inserted into the interior of the furnace body (1) from the slot at the top of the furnace body (1) and abuts against the inner wall of the furnace lining (13); A furnace pot (3), which is entirely inserted into the interior of the furnace body (1) from the opening on the side of the furnace body (1), the furnace pot (3) being in contact with the heating body (2) and being heated by the heating body (2); A furnace cover (4), installed at the opening on the side of the furnace body (1), and used to open or close the opening; A material frame (5) is arranged inside the furnace tank (3) and is used for placing the workpiece to be nitrided; A vacuum system, installed on the furnace tank (3), used for evacuating the interior of the furnace tank (3); A nitrogen atmosphere system (6) enters from the outside of the furnace body (1) into the inside of the furnace tank (3) and is used to transport nitrogen into the inside of the furnace tank (3).

2. The horizontal solution nitriding furnace according to claim 1, characterized in that: It also includes a nitrogen circulation system (7) installed on the furnace cover (4) and used to circulate the nitrogen inside the furnace tank (3).

3. The horizontal solid solution nitriding furnace according to claim 2, characterized in that: The nitrogen circulation system (7) comprises a vacuum sealing motor (71), an air supply device, a water cooling device, a sealing device and a bracket, and is fixed to the furnace cover (4) via the bracket. The air supply device is driven by the vacuum sealing motor (71) and supplies air into the furnace tank (3). The water cooling device is installed on the vacuum sealing motor (71) and is used to cool the vacuum sealing motor (71). The sealing device is installed between the bracket and the furnace cover (4) and is used to seal the gap between the two.

4. The horizontal solution nitriding furnace according to claim 1, characterized in that: The furnace frame (11) comprises a door post (111) and a truss (112); the door post (111) is located at an opening of the furnace body (1) and is connected to the truss (112).

5. The horizontal solution nitriding furnace according to claim 1, characterized in that: The heating body (2) comprises a plurality of U-shaped heating rods (21) and a plurality of lead-out rods (22), and the U-shaped heating rods (21) are distributed on the left and right inner walls and the rear inner wall of the furnace lining (13); the plurality of lead-out rods (22) are arranged on the top of the furnace body (1), the plurality of U-shaped heating rods (21) are vertically installed in the furnace lining (13), the plurality of lead-out rods (22) are connected to each other via a line, and a protective cover (23) for protecting the lead-out rods (22) is arranged on the top of the furnace body (1).

6. The horizontal solid solution nitriding furnace according to claim 3, characterized in that: The furnace tank (3) comprises a furnace tank main structure (31), a water cooling jacket (32), an exhaust pipe (33) and an external pipe socket; the water cooling jacket (32), the exhaust pipe (33) and the external pipe socket are all arranged on the furnace tank main structure (31), the exhaust pipe (33) is connected to the vacuum system, and the furnace tank main structure (31) is sealedly connected to the furnace body (1).

7. The horizontal solid solution nitriding furnace according to claim 1, characterized in that: The furnace cover (4) comprises a furnace cover main structure (42), a mounting seat, a furnace cover sealing device (41), an opening and closing mechanism (43), a pressing mechanism (44) and a power-off protection switch. The mounting seat and the power-off protection switch are arranged on the furnace cover main structure (42). The furnace cover sealing device (41) is a rotating chuck structure and is arranged between the furnace cover main structure (42) and the furnace tank (3). The pressing mechanism (44) comprises two telescopic components. The telescopic ends of the two telescopic components are respectively connected to the radial ends of the furnace cover sealing device (41). The telescopic directions of the two telescopic components are opposite and respectively perpendicular to the radial direction of the furnace cover sealing device (41). The opening and closing mechanism (43) is fixedly mounted on the side of the furnace body (1) and connected to the furnace cover main structure (42), and is used to drive the furnace cover (4) to open or close the opening.

8. The horizontal solid solution nitriding furnace according to claim 1, characterized in that: A plurality of hangers (51) for hanging workpieces to be nitrided are arranged inside the material frame (5), a plurality of grooves (54) are evenly arranged on the crossbeam (53) of the material frame (5), and two ends of the hangers (51) are respectively movably connected in two oppositely arranged grooves (54).

9. The horizontal solid solution nitriding furnace according to claim 6, characterized in that: A water cooling system (8) is also provided, the water cooling system (8) being connected to the water cooling device and the water cooling jacket (32) and being used to cool the vacuum sealing motor (71) and the furnace tank main structure (31).

10. The horizontal solid solution nitriding furnace according to claim 1, characterized in that: The nitrogen atmosphere system (6) comprises a delivery pipe (61), an exhaust pipe, a safety valve and a furnace pressure control device. The safety valve and the furnace pressure control device are arranged on the delivery pipe (61). The delivery pipe (61) is connected to the furnace body (1) and leads to the interior of the furnace tank (3). The exhaust pipe comprises a coil (62) and an injection pipe (63). The coil (62) is in a circular ring structure and is connected to the delivery pipe (61). A plurality of injection pipes (63) are evenly arranged along the circumferential direction of the coil (62). The injection pipe (63) extends to the interior of the furnace tank (3). A plurality of gas outlet holes (64) are evenly distributed on the injection pipe (63). In the axial direction of the gas outlet holes (64), the aperture of the gas outlet holes (64) gradually increases from the outside of the furnace tank (3) to the inside of the furnace tank (3).

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