Large vacuum high-pressure gas quenching equipment

Abstract

The invention belongs to the field of vacuum high-pressure gas quenching technology and vacuum heat treatment equipment, and particularly relates to large horizontal vacuum high-pressure gas quenching equipment with an ultra-long uniform temperature zone. The furnace comprises a furnace shell, a heating chamber is arranged in the furnace shell, and an air cooling heat exchange system, a vacuum system, an inflation and deflation system and a heating control cabinet system are connected to the furnace shell through connectors; the furnace shell comprises a front furnace body, a plurality of sections of middle furnace bodies and a rear furnace body which are sequentially connected with one another, a front furnace opening is formed in the front furnace body, a front furnace door is arranged at the front furnace opening, a rear furnace opening is formed in the rear furnace body, and a rear furnace door is arranged at the rear furnace opening; the expansion requirements of any size are met; the transmission feeding system is designed in an expandable and spliced track structure, and the furnace door moving assembly can drive the front furnace door to move in the X direction and the Y direction of the horizontal plane.

Description

Technical Field

[0001] The present invention belongs to the field of vacuum high-pressure gas quenching technology and vacuum heat treatment equipment, and particularly relates to a horizontal vacuum high-pressure gas quenching equipment with an extremely long uniform temperature zone for large-sized workpieces. Background Art

[0002] Vacuum high-pressure gas quenching technology is an advanced heat treatment process. After being processed by vacuum high-pressure gas quenching technology, the surface of the workpiece is bright, without carbon increase or decarburization, which can increase the service life of products under service conditions of bearing friction and contact stress by several times or even more. Moreover, after quenching, the size and deformation of the workpiece are small, the hardness is uniform, the process stability and repeatability are good, which is of more important significance for the heat treatment industrial applications using computer microelectronics technology and intelligent control systems for mass production.

[0003] With the development of strategic emerging industries such as nuclear power energy and aerospace in China, the continuous growth of the demand for high-performance large-sized pipes, the requirements for the processing capacity and production efficiency of large-sized vacuum high-pressure gas quenching equipment have also increased accordingly. However, the size of the uniform temperature zone of existing mainstream vacuum high-pressure gas quenching equipment is limited, and there are problems such as insufficient single furnace loading and long production cycle, which seriously restrict the manufacturing efficiency of the core components of high-end equipment. Taking the utility model patent: A bottom-loading vacuum high-pressure gas quenching furnace equipment (publication number CN217809542U) as an example, it adopts a split furnace body structure and a hanging heating chamber design. Although it has advantages such as low equipment manufacturing cost and convenient maintenance, the effective length of the uniform temperature zone of this vacuum high-pressure gas quenching furnace is limited, and the productivity of each material preparation is low, which cannot meet the current domestic demand for the core component materials of the high-end equipment industry. Summary of the Invention

[0004] To solve the above problems and deficiencies in the prior art, the present invention proposes a large-sized horizontal vacuum high-pressure gas quenching equipment with an extremely long uniform temperature zone. This equipment adopts the principle technology of an anti-strain expandable structure for a large-sized vacuum cavity and the modular design technology of a transmission and feeding system, realizing the efficient preparation of high-performance materials under complex working conditions, and meeting the requirements of high cooling rate and low deformation under the conditions of an extremely long uniform temperature zone and a large material handling capacity. The implementation method of this invention is more accurate, has better performance, and higher safety.

[0005] To achieve the above object, the present invention adopts the following technical solutions, including a furnace housing, inside which a heating chamber is arranged, and an air-cooled heat exchange system, a vacuum system, a gas charging and discharging system, and a heating control cabinet system are connected to the furnace housing through interfaces; The furnace housing includes a front furnace body, several middle furnace bodies, and a rear furnace body that are sequentially connected to each other. A front furnace opening is provided on the front furnace body, and a front furnace door is arranged at the front furnace opening. A rear furnace opening is provided on the rear furnace body, and a rear furnace door is arranged at the rear furnace opening.

[0006] As a preferred embodiment of the present invention, the front furnace body includes an outer cylinder and an inner cylinder. One end of the front furnace body close to the front furnace opening is provided with a first furnace door flange for connecting the front furnace door. One end of the front furnace body close to the middle furnace body is provided with a connecting flange for connecting the middle furnace body. The front furnace body is provided with a vacuum thermocouple connection pipe and a pressure gauge connection pipe for connecting with the vacuum system and the pressure gauge assembly. The front furnace body is provided with an air inlet and an air outlet for connecting with the air-cooled heat exchange system. The bottom of the front furnace body is provided with furnace legs for support.

[0007] As another preferred embodiment of the present invention, one end of the front furnace door close to the front furnace opening is provided with a second furnace door flange for connecting with the first furnace door flange. One side of the front furnace door close to the front furnace opening is provided with a spherical crown inner head. One side of the front furnace door far from the front furnace opening is provided with a spherical crown outer head, a guard plate, a nameplate seat and a lifting lug for connecting with the lifting device. The guard plate is provided with a furnace door support. The front furnace door is provided with an observation window for facilitating the observation of the working state inside the furnace.

[0008] As the third preferred embodiment of the present invention, the heating chamber includes a frame. The frame includes ring ribs, vertical ribs, columns and column rings. The columns are connected to the column rings, and the column rings are welded to the inner wall of the furnace shell. A heat preservation layer is arranged inside the frame, and several groups of heating elements are arranged inside the heat preservation layer. The bottom of the frame is provided with pulleys for facilitating the movement and maintenance of the heating chamber. The frame is provided with an air inlet nozzle and a return air outlet, and the air inlet nozzle and the return air outlet are connected to the air-cooled heat exchange system.

[0009] As the fourth preferred embodiment of the present invention, it further includes a transmission feeding system. The transmission feeding system corresponds to the position of the front furnace door. The transmission feeding system includes an inner track arranged inside the furnace shell and a transmission track arranged outside the furnace shell. A two-layer material car, a transmission component for controlling the movement of the two-layer material car and a limiting device for limiting the two-layer material car are arranged on the transmission track; The transmission track includes a fixed track, and one side of the fixed track close to the front furnace door is connected with a folding track for docking with the inner track through a folding shaft; The two-layer material car includes a car body, a top plate and wheels; The transmission component includes a reducer motor, a transmission gear and a transmission rack. The reducer motor is connected to the transmission gear, and the transmission gear is connected to the transmission rack; The limiting device is arranged at both ends of the transmission track close to the front furnace door and far from the front furnace door; An air cylinder component for controlling the lifting of the storage device on the two-layer material car and a counterweight box are arranged on the two-layer material car. A gas storage device for supplying gas to the air cylinder component is arranged inside the counterweight box. The gas storage device is connected to the air cylinder component through an air path, and the on-off of the air path is controlled by a solenoid valve.

[0010] As the fifth preferred embodiment of the present invention, it further includes a furnace door moving assembly. The furnace door moving assembly includes a main frame body. Two parallel guide rails are arranged on the main frame body. Sliders are arranged on both of the two guide rails. A support seat is arranged on the slider. A beam for connecting with the front furnace door is fixed by two support seats. Two parallel cylinders are arranged on the main frame body. The end of the telescopic rod of the cylinder is connected with the beam. The setting direction of the cylinder is parallel to the setting direction of the guide rail. A plurality of moving wheels and a gear-rack structure are arranged at the bottom of the main frame body. The setting direction of the gear-rack structure is perpendicular to the setting direction of the guide rail. A motor bracket is arranged on the ground on the side of the main frame body. A driving motor is arranged through the motor bracket. The output shaft of the driving motor is connected with the gear in the gear-rack structure. A drag chain bracket is arranged at one end of the main frame body close to the cylinder. A drag chain is arranged through the drag chain bracket.

[0011] As the sixth preferred embodiment of the present invention, a cylinder rotating door opening assembly is arranged on the front furnace body. The cylinder rotating door opening assembly includes a locking cylinder and a locking ring. The locking ring is arranged between the front furnace door and the front furnace opening. The telescopic rod of the locking cylinder is connected with the locking ring.

[0012] The beneficial effects of the present invention are as follows: 1. The furnace shell of the present invention adopts an anti-strain expandable structure design to meet the high-strength and interchangeability requirements of large vacuum furnace equipment; the sectional structure design of the furnace equipment can increase or decrease the length of the equipment according to the material size. This main structure design scheme greatly increases the utilization rate of the effective volume and is convenient for transportation and disassembly. Due to the particularly long axial depth of the tunnel furnace, the furnace shell adopts a multi-section assembly form, and the size of each section of the furnace body is the same, which not only ensures interchangeability but also is conducive to subsequent furnace type transformation and improves the use range of the equipment. The furnace door adopts a front and rear double-opening structure, has an automatic opening and closing function, is operated by a button and is provided with a safety interlock device to prevent misoperation or malfunction and ensure the safety and reliability of the system. The furnace door is opened and closed in a horizontal moving manner. The furnace door is vertically located on a translatable trolley. The trolley can be translated in the X and Y directions on the bottom track. The trolley has a horizontal adjustment function to ensure that the furnace door flange surface and the furnace body flange surface are in a parallel state, which is conducive to sealing and preventing deformation and avoiding the jamming and blocking phenomenon caused by the deformation of heat-receiving parts such as the furnace bed during later use.

[0013] 2. The heating chamber of the present invention adopts a modular design, with a horizontal 12-sided structure. Each section is interchangeable, easy to disassemble and repair, meeting the expansion requirements of any size. The heating zone adopts multi-zone temperature control, and the working interval of the equipment can be determined according to the length of the processed material, without the need to use all of it, avoiding waste and increasing the material preparation efficiency. The frame is composed of stainless steel plates, and there are two sets of pulleys at the bottom to enter the furnace shell, making the heating chamber easy to maintain and replace. The heating element uses a heating element made of high-strength graphite material, effectively reducing thermal expansion during the heating process. The insulation layer adopts a hard graphite felt composite structure, and the graphite felt is deeply graphitized, without sagging, cracking, or peeling during operation, ensuring that the vacuum furnace is pollution-free and achieving the insulation effect. The insulation layer adopts a splicing form, which is simple to manufacture and reduces the installation difficulty. To ensure the smooth loading and unloading of the charging car, the charging car track in the heating chamber adopts an integrated design. The material is selected as heat-resistant steel, and a special design connection method is used to connect the charging car tracks into a whole, ensuring smooth loading and unloading while being easy to replace and maintain.

[0014] 3. The transmission and feeding system of the present invention adopts a design form of expandable and spliced track structure. Since the charging car track is heated with the furnace and has a large load, it will deform and fail after long-term use. To meet the action requirements and movement time requirements, the expansion amount generated by the actual operating track of the transmission and feeding system under working conditions such as high temperature during use is fully considered, ensuring the reliability of the workpiece transmission system operation. It is made of heat-resistant steel, making the scattered parts into a whole, increasing stability, enabling the charging car to enter and exit smoothly, and at the same time not increasing the installation and replacement difficulty. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Figure 1 It is a schematic diagram of the overall structure of the present invention.

[0016] Figure 2 It is a schematic diagram of the furnace shell structure.

[0017] Figure 3 It is a schematic diagram of the front furnace body structure.

[0018] Figure 4 It is a schematic diagram of the front furnace door structure.

[0019] Figure 5 It is a schematic diagram of the furnace door moving assembly structure.

[0020] Figure 6 It is a partial enlarged view of the moving motor of the furnace door moving assembly.

[0021] Figure 7 It is a schematic diagram of the overall structure of the multi-section heating chamber.

[0022] Figure 8 It is a schematic diagram of the internal structure of the heating chamber.

[0023] Figure 9 It is a schematic diagram of the overall structure of the transmission and feeding system.

[0024] Figure 10 It is a schematic diagram of the structure of the transmission component.

[0025] Figure 11 It is a schematic diagram of the partial structure of the transmission and feeding system.

[0026] Figure 12 It is a schematic diagram of the structure of the track assembly mechanism.

[0027] Figure 13 It is a schematic diagram of the structure of the fixed track.

[0028] Figure 14 It is a schematic diagram of the structure of the folding track.

[0029] In the attached drawings, 1 is the furnace shell, 2 is the heating chamber, 21 is the ring rib, 22 is the vertical rib, 23 is the heat insulation layer, 24 is the heating element, 25 is the pulley, 26 is the column, 27 is the column ring, 28 is the air inlet nozzle, 29 is the air return port, 210 is the electrode interface, 3 is the air-cooled heat exchange system, 4 is the transmission and feeding system, 41 is the track assembly mechanism, 411 is the fixed track, 412 is the folding shaft, 413 is the folding track, 42 is the transmission component, 421 is the reduction motor, 422 is the transmission gear, 423 is the transmission rack, 43 is the pneumatic component, 44 is the limit device, 45 is the two-layer charging car, 451 is the car body, 452 is the top plate, 453 is the wheel, 46 is the counterweight box, 47 is the gas storage device, 5 is the vacuum system, 6 is the gas charging and discharging system, 7 is the electrical control cabinet system, 8 is the heating control cabinet system, 9 is the water-cooled system, 10 is the platform system, 11 is the front furnace body, 111 is the first furnace door flange, 112 is the outer cylinder, 113 is the inner cylinder, 114 is the connecting flange, 115 is the vacuum connection pipe, 116 is the furnace leg, 117 is the air outlet, 118 is the air inlet, 119 is the thermocouple connection pipe, 121 is the pressure gauge connection pipe, 12 is the front section of the middle furnace body, 13 is the middle section of the middle furnace body, 14 is the rear section of the middle furnace body, 15 is the rear furnace body, 16 is the locking ring, 17 is the front furnace door, 171 is the second furnace door flange, 172 is the spherical crown outer head, 173 is the spherical crown inner head, 174 is the nameplate seat, 175 is the lifting lug, 176 is the guard plate, 177 is the front furnace door bracket, 18 is the rear furnace door, 19 is the cylinder rotary door opening assembly, 120 is the furnace door moving assembly, 1201 is the main body of the vehicle frame, 1202 is the support seat, 1203 is the slider, 1204 is the beam, 1205 is the moving motor, 1206 is the motor bracket, 1207 is the guide rail, 1208 is the cylinder, 1209 is the moving wheel, 1210 is the drag chain bracket, 1211 is the drag chain. Detailed implementation mode

[0030] The present invention adopts the following specific scheme, as Figure 1 shown, the whole equipment is twenty meters long and includes a furnace shell 1. A heating chamber 2 is arranged inside the furnace shell 1. An air-cooled heat exchange system 3, a vacuum system 5, a gas charging and discharging system 6, an electrical control cabinet system 7, a heating control cabinet system 8, a water-cooled system 9 and a platform system 10 are connected to the furnace shell 1 through interfaces; As Figure 2 shown, the furnace shell 1 includes a front furnace body 11, several middle furnace bodies and a rear furnace body 15 that are connected to each other in sequence. The middle furnace body includes a front section 12 of the middle furnace body, a middle section 13 of the middle furnace body and a rear section 14 of the middle furnace body. A front furnace opening is arranged on the front furnace body 11, and a front furnace door 17 is arranged at the front furnace opening. A rear furnace opening is arranged on the rear furnace body 15, and a rear furnace door 18 is arranged at the rear furnace opening.

[0031] As a preferred scheme of the present invention, as Figure 3 shown, the front furnace body 11 includes an outer cylinder 112 and an inner cylinder 113. One end of the front furnace body 11 close to the front furnace opening is provided with a first furnace door flange 111 for connecting the front furnace door 17. One end of the front furnace body 11 close to the middle furnace body is provided with a connecting flange 114 for connecting the middle furnace body. The front furnace body 11 is provided with a vacuum thermocouple connecting pipe 119 and a pressure gauge connecting pipe 120 for connecting with the vacuum system 5 and the pressure gauge assembly 121. The front furnace body 11 is provided with an air inlet 118 and an air outlet 117 for connecting with the air-cooled heat exchange system 3. The bottom of the front furnace body 11 is provided with furnace legs 116 for support.

[0032] As another preferred scheme of the present invention, as Figure 4 shown, one end of the front furnace door 17 close to the front furnace opening is provided with a second furnace door flange 171 for connecting with the first furnace door flange 111. A spherical crown inner head 173 is arranged on one side of the front furnace door 17 close to the front furnace opening. A spherical crown outer head 172, a guard plate 176, a nameplate seat 174 and a lifting lug 175 for connecting with a lifting device are arranged on the side of the front furnace door 17 far from the front furnace opening. A furnace door bracket 177 is arranged on the guard plate 176. An observation window for conveniently observing the working state inside the furnace is arranged on the front furnace door 17.

[0033] As the third preferred scheme of the present invention, as Figure 7 and Figure 8As shown in the figure, heating chambers 2 are provided in the front furnace body 11, each section of the middle furnace body, and the rear furnace body 15. The heating chamber 2 adopts a horizontal double-layer water-cooled structure. The heating chamber 2 includes a framework composed of stainless steel plates. Inside the framework, there are annular ribs 21, vertical ribs 22, columns 26, and column rings 27. The columns 26 are connected to the column rings 27, and the column rings 27 are welded to the inner wall of the furnace shell 1. A heat preservation layer 23 is provided inside the framework. The heat preservation layer 23 adopts a hard graphite felt composite structure. A number of groups of heating elements 24 are provided inside the heat preservation layer 23. The heating elements 24 are made of high-strength graphite belts. The heating elements 24 are connected to the heating control cabinet system 8 through electrode interfaces 210. Each group of heating elements 24 can be individually disassembled and controlled. Pulley 25 for facilitating the movement and maintenance of the heating chamber 2 is provided at the bottom of the framework. The heating chamber 2 can be pushed into or taken out of the furnace shell 1 through the pulley 25. Air inlet nozzles 28 and air return openings 29 are provided on the framework. The air inlet nozzles 28 and air return openings 29 are connected to the air-cooled heat exchange system 3. By adjusting the positions and quantities of the air inlet nozzles 28 and air return openings 29, the cooling speed and uniformity of the workpiece can be better controlled.

[0034] As the fourth preferred embodiment of the present invention, as Figures 9 - 14 shown, it further includes a transmission feeding system 4 responsible for transporting workpiece materials. The transmission feeding system 4 corresponds to the position of the front furnace door 17. The transmission feeding system 4 includes an inner track provided inside the furnace shell 1 and a transmission track 41 provided outside the furnace shell 1. A two-layer material car 45, a transmission component 42 for controlling the movement of the two-layer material car 45, and a limiting device 44 for limiting the two-layer material car 45 are provided on the transmission track 41; The transmission track 41 includes a fixed track 411. One side of the fixed track 411 close to the front furnace door 17 is connected with a folding track 413 for docking with the inner track through a folding shaft 412. When the two-layer material car 45 travels to the position of the front furnace door 17, the folding track 413 is folded to dock with the inner track to ensure the stable travel of the entire two-layer material car 45; The two-layer material car 45 includes a car body 451, a top plate 452, and wheels 453; The transmission component 42 includes a reduction motor 421, a transmission gear 422, and a transmission rack 423. The reduction motor 421 is connected to the transmission gear 422, and the transmission gear 422 is connected to the transmission rack 423; The limiting device 44 is provided at both ends of the transmission track 41 close to and far from the front furnace door 17; An air cylinder component 43 for controlling the lifting of the storage device on the two-layer material car 45 and a counterweight box 46 are provided on the two-layer material car 45. An air storage device 47 for supplying air to the air cylinder component 43 is provided inside the counterweight box 46. The air storage device 47 is connected to the air cylinder component 43 through an air path, and the on-off of the air path is controlled by a solenoid valve; Through the cooperation of components such as the transmission assembly 42, the pneumatic assembly 43, and the limit device 44, the movement of materials in the X and Z directions is realized.

[0035] During operation, the assembled workpiece is sent into the furnace shell 1 by the two-layer material truck 45, and then the front furnace door 17 is closed. The entire heat treatment process such as vacuum pumping, heating, and cooling is controlled through a preset program.

[0036] As the fifth preferred solution of the present invention, as Figure 5 and Figure 6 shown, it further includes a furnace door moving assembly 120. The furnace door moving assembly 120 includes a vehicle frame main body 1201. Two parallel guide rails 1207 are arranged on the vehicle frame main body 1201. Sliders 1203 are arranged on both of the two guide rails 1207. A support seat 1202 is arranged on the slider 1203. A beam 1204 for connecting with the front furnace door bracket 177 is fixed through the two support seats 1202. Two parallel cylinders 1208 are arranged on the vehicle frame main body 1201. The end of the telescopic rod of the cylinder 1208 is connected to the beam 1204. The arrangement direction of the cylinder 1208 is parallel to the arrangement direction of the guide rail 1207; several moving wheels 1209 and a gear-rack structure are arranged at the bottom of the vehicle frame main body 1201. The arrangement direction of the gear-rack structure is perpendicular to the arrangement direction of the guide rail 1207. A motor bracket 1206 is arranged on the ground on the side of the vehicle frame main body 1201. A driving motor 1205 is arranged through the motor bracket 1206. The output shaft of the driving motor 1205 is connected to the gear in the gear-rack structure. A drag chain bracket 1210 is arranged at one end of the vehicle frame main body 1201 close to the cylinder 1208. A drag chain 1211 is arranged through the drag chain bracket 1210. The drag chain 1211 is used to guide and protect the wire tube; the furnace door moving assembly 120 can drive the front furnace door 17 to move in the X and Y directions on the horizontal plane, ensuring that the furnace door flange surface and the furnace body flange surface are in a parallel state.

[0037] As the sixth preferred solution of the present invention, a cylinder rotary door opening assembly 19 is arranged on the front furnace body 11. The cylinder rotary door opening assembly 19 includes a locking cylinder and a locking ring 16. The locking ring 16 is arranged between the front furnace door 17 and the front furnace opening. The telescopic rod of the locking cylinder is connected to the locking ring 16.

[0038] During operation, when it is necessary to open the front furnace door 17 and move the front furnace door 17 away to facilitate avoiding the workpiece, the specific operation is as follows: control the locking ring 16 to rotate through the locking cylinder to open the front furnace door 17, control the cylinder 1208 to extend and retract to drive the beam 1204 and its front furnace door 17 to move along the direction of the guide rail 1207 and away from the furnace shell 1. Subsequently, control the moving motor 1205 to work to drive the gear-rack structure to work, so that the vehicle frame main body 1201 drives the front furnace door 17 to move along the horizontal direction perpendicular to the arrangement direction of the furnace shell 1, leaving an avoidance space for the workpiece to enter the furnace shell 1.

[0039] First, place the workpiece on the second-layer material cart 45. Control the pneumatic component 43 to lift the workpiece, and then transport the workpiece into the furnace shell 1. The pneumatic component 43 deflates to let the workpiece fall onto the material rack. The second-layer material cart 45 moves out of the furnace shell 1. After locking the front furnace door 17 through the cylinder-rotated door-opening component 19, start the Roots pump unit in the vacuum system 5 to conduct rough evacuation of the furnace body. When the vacuum degree reaches 10 Pa, start the diffusion pump to evacuate the furnace body. When the vacuum degree reaches 10 -3 Pa, the heating chamber starts to heat according to the preset heating curve. After the heating curve ends, stop evacuation and fill the furnace with inert gas. Subsequently, start the fan to conduct gas quenching on the workpiece. When the temperature of the workpiece drops below 50 °C, turn off the fan and take out the workpiece.

[0040] It can be understood that the above specific description of the present invention is only for explaining the present invention and is not limited to the technical solutions described in the embodiments of the present invention. Those of ordinary skill in the art should understand that the present invention can still be modified or equivalently replaced to achieve the same technical effects; as long as it meets the usage requirements, it is within the protection scope of the present invention.

Claims

1. A large-scale vacuum high-pressure gas quenching equipment, characterized in that, It includes a furnace housing (1), inside which there is a heating chamber (2). The furnace housing (1) is connected with an air-cooled heat exchange system (3), a vacuum system (5), a gas charging and discharging system (6) and a heating control cabinet system (8) through interfaces. The furnace housing (1) includes a front furnace body (11), several middle furnace bodies and a rear furnace body (15) which are connected to each other in sequence. A front furnace opening is provided on the front furnace body (11), and a front furnace door (17) is arranged at the front furnace opening. A rear furnace opening is provided on the rear furnace body (15), and a rear furnace door (18) is arranged at the rear furnace opening.

2. The large-scale vacuum high-pressure gas quenching equipment according to claim 1, characterized in that, The front furnace body (11) includes an outer cylinder (112) and an inner cylinder (113). At one end of the front furnace body (11) close to the front furnace opening, there is a first furnace door flange (111) for connecting the front furnace door (17). At one end of the front furnace body (11) close to the middle furnace body, there is a connecting flange (114) for connecting the middle furnace body. On the front furnace body (11), there are a vacuum thermocouple connecting pipe (119) and a pressure gauge connecting pipe (120) for connecting with the vacuum system (5) and the pressure gauge assembly (121). On the front furnace body (11), there are an air inlet (118) and an air outlet (117) for connecting with the air-cooled heat exchange system (3). At the bottom of the front furnace body (11), there are furnace legs (116) for support.

3. A large-scale vacuum high-pressure gas quenching equipment as described in claim 1, characterized in that, At one end of the front furnace door (17) close to the front furnace opening, there is a second furnace door flange (171) for connecting with the first furnace door flange (111). On one side of the front furnace door (17) close to the front furnace opening, there is a spherical crown inner head (173). On the side of the front furnace door (17) far from the front furnace opening, there are a spherical crown outer head (172), a guard plate (176), a nameplate seat (174) and a lifting lug (175) for connecting with a lifting device. A furnace door support (177) is arranged on the guard plate (176). An observation window is arranged on the front furnace door (17) for easily observing the working state inside the furnace.

4. A large-scale vacuum high-pressure gas quenching equipment according to claim 1, characterized in that The heating chamber (2) includes a framework. Inside the framework, there are ring ribs (21), vertical ribs (22), columns (26) and column rings (27). The columns (26) are connected to the column rings (27), and the column rings (27) are welded to the inner wall of the furnace housing (1). A heat preservation layer (23) is arranged inside the framework. Inside the heat preservation layer (23), there are several groups of heating elements (24). At the bottom of the framework, there are pulleys (25) for easily moving and maintaining the heating chamber (2). Air inlet nozzles (28) and air return openings (29) are arranged on the framework, and the air inlet nozzles (28) and the air return openings (29) are connected with the air-cooled heat exchange system (3).

5. A large-scale vacuum high-pressure gas quenching equipment as described in claim 1, characterized in that, It also includes a transmission feeding system (4). The transmission feeding system (4) corresponds to the position of the front furnace door (17). The transmission feeding system (4) includes an inner track arranged inside the furnace housing (1) and a transmission track (41) arranged outside the furnace housing (1). On the transmission track (41), there is a two-layer material car (45), a transmission component (42) for controlling the movement of the two-layer material car (45) and a limiting device (44) for limiting the two-layer material car (45). The transmission track (41) includes a fixed track (411). One side of the fixed track (411) close to the front furnace door (17) is connected with a folding track (413) for docking with the inner track through a folding shaft (412). The two-layer charging car (45) includes a car body (451), a top plate (452) and wheels (453). The transmission assembly (42) includes a speed reducer motor (421), a transmission gear (422) and a transmission rack (423). The speed reducer motor (421) is connected with the transmission gear (422), and the transmission gear (422) is connected with the transmission rack (423). The limiting device (44) is provided at both ends of the transmission track (41) close to and away from the front furnace door (17). An air cylinder assembly (43) for controlling the lifting of the storage device on the two-layer charging car (45) and a counterweight box (46) are arranged on the two-layer charging car (45). A gas storage device (47) for supplying gas to the air cylinder assembly (43) is arranged in the counterweight box (46). The gas storage device (47) is connected with the air cylinder assembly (43) through an air path, and the on-off of the air path is controlled by a solenoid valve.

6. A large-scale vacuum high-pressure gas quenching equipment according to claim 1, characterized in that, It further includes a furnace door moving assembly (120). The furnace door moving assembly (120) includes a frame body (1201). Two parallel guide rails (1207) are arranged on the frame body (1201). Sliders (1203) are arranged on both of the two guide rails (1207). A support seat (1202) is arranged on the slider (1203). A beam (1204) for connecting with the front furnace door (17) is fixed through the two support seats (1202). Two parallel air cylinders (1208) are arranged on the frame body (1201). The end of the telescopic rod of the air cylinder (1208) is connected with the beam (1204). The arrangement direction of the air cylinder (1208) is parallel to the arrangement direction of the guide rail (1207). A plurality of moving wheels (1209) and a gear-rack structure are arranged at the bottom of the frame body (1201). The arrangement direction of the gear-rack structure is perpendicular to the arrangement direction of the guide rail (1207). A motor bracket (1206) is arranged on the ground on the side of the frame body (1201). A driving motor (1205) is arranged through the motor bracket (1206). The output shaft of the driving motor (1205) is connected with the gear in the gear-rack structure. A drag chain bracket (1210) is arranged at one end of the frame body (1201) close to the air cylinder (1208). A drag chain (1211) is arranged through the drag chain bracket (1210).

7. A large-scale vacuum high-pressure gas quenching equipment as described in claim 1, characterized in that, A cylinder rotary door opening assembly (19) is arranged on the front furnace body (11). The cylinder rotary door opening assembly (19) includes a locking cylinder and a locking ring (16). The locking ring (16) is arranged between the front furnace door (17) and the front furnace opening. The telescopic rod of the locking cylinder is connected with the locking ring (16).

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