Core-pulling electronic air system suitable for carburizing furnace

Abstract

The present application relates to the technical field of heat treatment, and especially relates to a core-pulling type electronic wind system suitable for a carburizing furnace. The core-pulling type electronic wind system comprises an electronic wind system, a high-voltage power supply and an electronic wind blowing unit, and further comprises a carburizing furnace loading support for supporting a workpiece to be treated. The electronic wind blowing unit comprises a blowing positive electrode, a blowing negative electrode and a guide cylinder. A mesh plate is fixed to the inner wall of the guide cylinder. The air outlet direction of the guide cylinder is towards the recessed part of the workpiece to be treated. The blowing positive electrode comprises at least three core-pulling electrodes, and the at least three core-pulling electrodes are respectively slidably arranged in the holes of the mesh plate. The electronic wind system is arranged in the furnace body of the carburizing furnace. The electronic wind system forms an ion wind which is directed to flow towards the recessed part of the workpiece to be treated. The high-temperature carburizing gas is forced to enter the recessed part of the workpiece to be treated, and the waste gas is carried out at the same time. The problem of uneven thickness of the carburizing layer of different parts of the complex workpiece in the furnace body of the carburizing furnace is solved.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of heat treatment, in particular to a core-pulling type electronic air system suitable for carburizing furnace. BACKGROUND

[0002] The carburizing furnace is a heat treatment equipment for surface chemical heat treatment of metal workpieces, which increases the carbon content of the surface layer of the workpiece by infiltrating active carbon atoms on the surface of the workpiece, thereby significantly improving the surface hardness and wear resistance of the workpiece, while maintaining good plasticity and toughness of the core of the workpiece.

[0003] In use, the workpieces to be treated are sent into the carburizing furnace on the carburizing furnace loading support, ensuring that there is a proper gap between the workpieces for gas circulation, the furnace door is sealed, heating is started, the furnace temperature is raised to the carburizing temperature (usually 920-930°C) and stabilized, and then propane is introduced into the furnace. A large number of active carbon atoms are generated by the decomposition of propane, which continuously infiltrate the surface of the workpiece and diffuse inward to form a carburized layer.

[0004] During the operation of the traditional carburizing furnace, the gas flowability of the recessed parts (including deep holes, narrow slits, and recessed parts) of the workpiece is very poor, and fresh active carbon atoms cannot be supplied in time. At the same time, hydrogen (H2) and other gases generated by the decomposition reaction will accumulate in the recesses. These waste gases will inhibit the continuation of the carburizing reaction, resulting in shallow carburized layer, low hardness or even no carburizing in the recessed parts of the workpiece, affecting the heat treatment effect.

[0005] In order to solve the above problems, the carburizing time is extended, but this will cause the problem of over-deep carburized layer on the exposed surface area. SUMMARY

[0006] This section is intended to summarize some aspects of the embodiments of the present application and briefly introduce some preferred embodiments. Some simplifications or omissions may be made in this section and the abstract and title of the specification to avoid obscuring the purpose of this section, abstract and title, and such simplifications or omissions cannot be used to limit the scope of the present application.

[0007] In view of the problems existing in the prior art, the present application is proposed. In order to solve the above technical problems, the present application provides the following technical solutions.

[0008] The core-pulling type electronic air system suitable for carburizing furnace comprises an electronic air system, the electronic air system comprises a high-voltage power supply and an electronic air blowing unit, and comprises a carburizing furnace loading support for supporting workpieces to be treated.

[0009] The electronic air blowing unit comprises a blowing positive electrode, a blowing negative electrode and a guide cylinder.

[0010] A mesh plate is fixed to the inner wall of the guide cylinder.

[0011] The air outlet direction of the guide cylinder is towards the recessed part of the workpiece to be treated;

[0012] The air supply positive electrode comprises at least three core-pulling electrodes, and the at least three core-pulling electrodes are respectively slidably arranged in the holes of the mesh plate;

[0013] The core-pulling electrode comprises an electrode column body, and the electrode column body is a hollow pipe;

[0014] The rear end of the hollow pipe is provided with a horn-shaped opening with an expanding flow area from front to rear;

[0015] The front end of the hollow pipe is provided with a closing structure with gradually reduced internal and external cross-sectional areas;

[0016] The opening of the closing structure is called a through opening;

[0017] A tungsten needle is coaxially and fixedly arranged in the closing structure;

[0018] The large end of the tungsten needle is located in the closing structure, and the small end of the tungsten needle is located outside the closing structure;

[0019] A gap for gas flow between the inside of the closing structure and the outside of the tungsten needle is called a guide gap;

[0020] The closing structure and the tungsten needle form a core-pulling structure;

[0021] The tungsten needle has a tapered part gradually tapering from the large end to the small end, and the tapered part is partially located in the through opening and partially located outside the through opening, the taper angle of the tapered part is not greater than the taper angle of the closing structure, thereby forming a fluid directional acceleration mechanism;

[0022] The negative electrode of the high-voltage power supply is connected to the carburizing furnace loading support, and the workpiece to be treated is fixed as the air supply negative electrode.

[0023] The above design places the electronic air system in the carburizing furnace body, forms a high-voltage electric field between the air supply positive electrode and the air supply negative electrode, ionizes the propane in the carburizing furnace, forms a directional flow of ion wind towards the recessed part of the workpiece to be treated, forcibly makes the high-temperature carburizing gas enter the recessed part of the workpiece to be treated, and carries out the waste gas with reduced activity, so that the carburizing reaction can be continuously and efficiently carried out, the surface of the workpiece to be treated is uniformly carburized, and compared with the traditional process, the process cycle is shortened, or a thicker carburizing layer is obtained in the same time.

[0024] The core-pulling electrode constitutes a high-efficiency fluid directional acceleration mechanism. When the gas passes through the gradually narrowing guide gap, the gas is accelerated, the penetration and directivity of the gas flow are enhanced, the gas flow has the advantages of strong directivity and energy concentration and is not easy to diffuse, the gas flow can more effectively penetrate into the deepest part of the recessed part of the workpiece, and the uniformity of carburizing of the surface of the workpiece is further improved.

[0025] The workpiece to be treated on the loading support of the carburizing furnace itself serves as a large-area air supply negative electrode, cooperates with a small-range air supply positive electrode, and establishes a non-uniform high-voltage electric field, so that the recessed part of the workpiece to be treated is the place with the highest electric field strength. The gas flow is accelerated and focused to form a high-speed jet under the action of the electric field. The high-speed jet moves along the direction of the electric field, that is, the direction of the recessed part of the workpiece to be treated, thereby realizing efficient, uniform and high-quality local active carburizing of complex workpieces and solving the problem of uneven thickness of the carburized layer of different parts of the complex workpiece.

[0026] Preferably, a bracket is arranged in the closing structure to support the tungsten steel needle.

[0027] Preferably, the electrode column, the tungsten steel needle and the bracket are made of tungsten steel, so that the electrode column, the tungsten steel needle and the bracket have high-temperature resistance, wear resistance and corrosion resistance, thereby being suitable for long-term stable use in the carburizing furnace body with a treatment temperature higher than 500°C.

[0028] Preferably, the sliding range of the core-pulling electrode is that the tip of the core-pulling electrode extends out of the outlet of the guide cylinder and is withdrawn into the outlet of the guide cylinder; the displacement range of the tip of the core-pulling electrode is that the tip extends out of the outlet of the guide cylinder by 12 mm and is withdrawn into the outlet of the guide cylinder by 12 mm; at least two core-pulling electrodes extend out of the guide cylinder, so that the extended core-pulling electrodes cover the middle part of the recessed part and the coverage area is not greater than 80% of the area of the recessed part and not less than 20% of the area of the recessed part. For recesses or holes with different depths and diameters, the distance between the tip of the core-pulling electrode and the surface of the workpiece is adjusted to accurately position the area with the strongest electric field and the highest gas flow velocity at the deepest position in the middle of the recessed part of the surface of the workpiece to be treated, the core-pulling electrode covers the middle position of the recess of the workpiece, and the coverage area is only between 20% and 80% of the area of the recess, so that there is enough high-speed jet to directly impact the middle position of the recessed area of the workpiece. After the high-speed jet impacts the bottom of the middle position of the recessed area, the high-speed jet diffuses to the surrounding area, flows upward along the side wall and is discharged from the area not covered by the core-pulling electrode, and does not collide with the newly injected gas flow to affect carburizing. The core-pulling electrode can be applied to different workpieces to be treated and improve the flexibility of carburizing treatment.

[0029] Preferably, the core-pulling electrodes located in the middle portion have the longest extension distance, and the core-pulling electrodes located in the surrounding portions have gradually reduced extension distances.

[0030] Preferably, the electronic wind system further comprises an electronic wind generating unit; the electronic wind generating unit comprises a pre-blowing positive electrode, a pre-blowing negative electrode and a pre-blowing guide cylinder; the pre-blowing positive electrode and the pre-blowing negative electrode are fixed in the pre-blowing guide cylinder along the front-rear direction; and the pre-blowing guide cylinder is connected with the guide cylinder through a direction adjusting assembly. By arranging the electronic wind generating unit at the air inlet end of the electronic wind blowing unit, the airflow is partially ionized in the high-intensity electric field before entering the guide cylinder, and forms a plasma rich in active particles such as excited-state molecules, ions and free radicals.

[0031] Preferably, the direction adjusting assembly comprises a hollow ball holder fixed to the pre-blowing guide cylinder; the ball holder is rotatably connected with a spherical joint; the spherical joint is connected with the guide cylinder; and the pre-blowing guide cylinder, the ball holder, the spherical joint and the inner cavity of the guide cylinder are through-connected to form an electronic wind airflow channel with adjustable direction. By adjusting the air outlet direction of the guide cylinder through the cooperation of the ball holder and the spherical joint, the guide cylinder can be directed towards the recessed portion of the workpiece to be processed and away from the protruding and thin-walled portions of the workpiece to be processed.

[0032] Preferably, the electronic wind system further comprises a carburizing furnace body; a high-voltage power supply is assembled in the carburizing furnace body; the blowing positive electrode and the pre-blowing positive electrode are connected with the positive electrode of the high-voltage power supply through a high-temperature-resistant metal busbar.

[0033] The pre-blowing negative electrode is connected with the negative electrode of the high-voltage power supply through a high-temperature-resistant metal busbar.

[0034] Preferably, a connecting ring is fixed to the outer wall of the guide cylinder; a connecting rod is assembled on the connecting ring; a furnace door is hingedly connected to the carburizing furnace body; the connecting rod extends radially along the carburizing furnace body to the vicinity of the furnace door; and the connecting rod and the guide cylinder form a manual deflection adjusting system. By the cooperation of the connecting rod and the connecting ring, the rotation angle of the guide cylinder can be adjusted conveniently by the worker standing at the furnace door.

[0035] In summary, the present application has the following advantages:

[0036] 1. By setting the electronic wind system in the carburizing furnace body, the problem of uneven carburizing of complex workpieces is solved, a plurality of core-pulling electrodes are used to generate high-speed directional jets towards the recessed parts of the workpieces to be processed, the gas flow is injected into the recessed areas of the workpieces to be processed, and the waste gas therein is replaced, the process cycle is shortened, the consumption of process gas is significantly reduced, the carburizing rate and efficiency are improved, and the uniformity of the carburized layer is improved.

[0037] 2. The electronic wind system comprises an electronic wind generating unit and an electronic wind blowing unit, the electronic wind generating unit generates stable high-speed airflow, and the electronic wind blowing unit accurately blows the high-speed airflow to form high-speed directional jets and accurately injects the jets into the most difficult-to-process recessed areas of the workpieces, improves the airflow intensity, and directly injects the airflow into the deepest part of the recessed parts of the workpieces to be processed, which is suitable for different workpieces, improves flexibility, and further improves the uniformity of the carburized layer. BRIEF DESCRIPTION OF DRAWINGS

[0038] In order to more clearly illustrate the technical solutions of the embodiments of the present application, the drawings needed in the following embodiment description will be briefly introduced. Obviously, the drawings in the following description are only some embodiments of the present application, and other drawings can be obtained by those skilled in the art without creative labor. Among them:

[0039] Fig. 1 It is the overall structure diagram of the core-pulling type electronic wind system suitable for the carburizing furnace of the present application;

[0040] Fig. 2 It is the structure diagram of the carburizing furnace body of the core-pulling type electronic wind system suitable for the carburizing furnace of the present application;

[0041] Fig. 3 It is the structure diagram of the carburizing furnace body of the core-pulling type electronic wind system suitable for the carburizing furnace of the present application;

[0042] Fig. 4 It is the structure diagram of the electrode outer tube of the core-pulling type electronic wind system suitable for the carburizing furnace of the present application.

[0043] In the figure, 1 is a carburizing furnace body; 2 is a guide cylinder; 3 is a mesh plate; 4 is a core-pulling electrode; 41 is an electrode column; 42 is a closing structure; 43 is a through opening; 44 is a tungsten steel needle; 45 is a support; 5 is a pre-blowing positive electrode; 6 is a pre-blowing negative electrode; 7 is a pre-blowing guide cylinder; 8 is a ball holder; 9 is a spherical joint. DETAILED DESCRIPTION

[0044] In order to make the above-mentioned objects, features and advantages of the present application more apparent and easy to understand, the specific embodiments of the present application will be described in detail below with reference to the drawings.

[0045] In the following description, numerous specific details are set forth in order to provide a thorough understanding of the present application. However, it will be apparent to one skilled in the art that the present application can be practiced without the specific details set forth in this description. In other instances, well-known methods, procedures, components, and circuits have not been described in detail so as not to unnecessarily obscure aspects of the present application.

[0046] Secondly, the present application is described in detail in combination with the schematic diagram. In the detailed description of the embodiments of the present application, the sectional view of the device structure is partially enlarged without the general proportion for the convenience of illustration, and the schematic diagram is only an example which should not limit the scope of protection of the present application. In addition, the three-dimensional spatial dimensions of length, width and depth should be included in the actual manufacture.

[0047] Thirdly, "one embodiment" or "an embodiment" referred to herein means that a specific feature, structure, or characteristic described can be included in one implementation of the present application. "In one embodiment" appearing in different places in the specification does not mean the same embodiment, nor does it mean an embodiment that is separate from or mutually exclusive with other embodiments.

[0048] Embodiment 1, refer to Figs. 1 to 4 The core-pulling type electronic air system suitable for carburizing furnace comprises an electronic air system, the electronic air system comprises a high-voltage power supply and an electronic air blowing unit, and comprises a carburizing furnace loading support for supporting a workpiece to be treated;

[0049] The electronic air blowing unit comprises a blowing positive electrode, a blowing negative electrode and a guide cylinder 2;

[0050] A mesh plate 3 is fixed to the inner wall of the guide cylinder 2;

[0051] The air outlet direction of the guide cylinder 2 is towards the recessed part of the workpiece to be treated;

[0052] The blowing positive electrode comprises at least three core-pulling electrodes 4, and the at least three core-pulling electrodes 4 are respectively slidably arranged in the holes of the mesh plate 3;

[0053] The core-pulling electrode 4 comprises an electrode column body 41, and the electrode column body 41 is a hollow pipe;

[0054] The rear end of the hollow pipe is provided with a horn opening with an enlarged flow area from front to rear;

[0055] The front end of the hollow pipe is provided with a closing structure 42 which gradually reduces the cross-sectional area of the inside and outside;

[0056] The opening of the closing structure 42 is called a through opening 43;

[0057] A tungsten needle 44 is coaxially fixedly assembled in the closing structure 42;

[0058] The big end of the tungsten needle 44 is located in the closing structure 42, and the small end of the tungsten needle 44 is located outside the closing structure 42;

[0059] There is a gap between the inside of the closing structure 42 and the outside of the tungsten needle 44 for the flow of gas, which is called a guide gap;

[0060] The closing structure 42 and the tungsten needle 44 form a core-pulling structure;

[0061] The tungsten needle 44 has a tapered tip portion gradually tapering from the big end to the small end, part of which is located in the through opening 43 and part of which is located outside the through opening 43, and the taper angle of the tapered tip portion is not greater than the taper angle of the closing structure 42, forming a fluid directional acceleration mechanism;

[0062] The negative electrode of the high-voltage power supply is connected to the carburizing furnace loading support, and the to-be-processed workpiece itself is used as the air supply negative electrode.

[0063] In this embodiment, the electronic wind system is arranged in the carburizing furnace body 1, the air supply positive electrode and the air supply negative electrode form a high-voltage electric field, ionize the propane in the carburizing furnace, form a directional flow of ion wind towards the recessed part of the to-be-processed workpiece, and forcibly make the high-temperature carburizing gas enter the recessed part of the to-be-processed workpiece, while carrying out the waste gas with reduced activity, so that the carburizing reaction can continue and be efficient, the surface of the to-be-processed workpiece is uniformly carburized, and compared with the traditional process, the process cycle is shortened or a thicker carburizing layer is obtained in the same time.

[0064] The core-pulling electrode 4 constitutes an efficient fluid directional acceleration mechanism, and the rear end of the hollow tube is provided with a flared opening to improve the gas flow rate of the gas entering the hollow tube. The gas entering the hollow tube will be further accelerated when passing through the gradually narrowing guide gap, thereby enhancing the penetration and directionality of the gas flow, making the gas flow have the advantages of strong directionality, concentrated energy, and difficulty in diffusion, and can more effectively penetrate into the deepest part of the recessed part of the workpiece, further improving the uniformity of carburizing on the surface of the workpiece.

[0065] The air supply negative electrode is connected to the carburizing furnace loading support, so that the to-be-processed workpiece on the carburizing furnace loading support itself serves as a large-area air supply negative electrode, cooperates with the small-range air supply positive electrode, establishes a non-uniform high-voltage electric field, and makes the recessed part of the to-be-processed workpiece as the place with the highest electric field strength. The gas flow is accelerated and focused to form a high-speed jet flow under the action of the electric field, and the high-speed jet flow moves along the direction of the electric field, i.e. the direction of the recessed part of the to-be-processed workpiece, thereby realizing efficient, uniform, and high-quality local active carburizing of complex workpieces and solving the problem of uneven thickness of the carburizing layer in different parts of the complex workpiece.

[0066] The closing structure 42 is provided with a support 45, and the tungsten needle 44 is supported by the support 45.

[0067] The electrode column body 41, the tungsten steel needle 44, and the bracket 45 are made of tungsten steel. The electrode column body 41, the tungsten steel needle 44, and the bracket 45 have high temperature resistance, wear resistance, and corrosion resistance, so as to be used stably for a long time in the carburizing furnace body 1 with a treatment temperature higher than 500°C.

[0068] The sliding range of the core electrode 4 is that the tip of the core electrode 4 extends out of the outlet of the guide cylinder 2 and is withdrawn into the outlet of the guide cylinder 2. The displacement range of the tip of the core needle electrode is that the tip extends out of the outlet of the guide cylinder 2 by 12 mm and is withdrawn into the outlet of the guide cylinder 2 by 12 mm. At least two core electrodes 4 extend out of the guide cylinder 2, so that the extended core electrodes 4 cover the middle part of the recessed part and the coverage area is not less than 20% of the area of the recessed part. For different depths and diameters of the recess or hole, the distance between the tip of the core electrode 4 and the surface of the workpiece is adjusted, so that the area with the strongest electric field and the highest airflow velocity is accurately positioned at the deepest position of the recessed part of the surface of the workpiece to be treated. The core electrode 4 covers the middle position of the recess of the workpiece, and the coverage area is only between 20% and 80% of the area of the recess, so that there is enough high-speed jet flow directly impacting the middle position of the recessed area of the workpiece. After the high-speed jet flow impacts the bottom of the middle position of the recessed area, it diffuses to the four directions, flows upward along the side wall, and is discharged from the area not covered by the core electrode 4, without colliding with the newly injected airflow to affect carburizing. The core electrode 4 can be applied to different workpieces to be treated, and the flexibility of carburizing treatment is improved.

[0069] The core electrode 4 located in the middle has the longest extension distance, and the surrounding core electrodes 4 have gradually decreasing extension distances. The several core electrodes 4 extend out of the guide cylinder 2 and are arranged in a gradient with the longest middle and gradually shorter periphery, so that the several core electrodes 4 form a convex simulation platform that is adapted to the shape of the recessed part of the workpiece. The convex simulation platform not only can impact the deepest part of the recessed part of the workpiece, but also can impact the side wall of the recessed part, and the uniformity of the carburizing layer thickness is further improved.

[0070] The electronic wind system further includes an electronic wind generating unit. The electronic wind generating unit includes a pre-blowing positive electrode 5, a pre-blowing negative electrode 6, and a pre-blowing guide cylinder 7. The pre-blowing positive electrode 5 and the pre-blowing negative electrode 6 are fixed in the pre-blowing guide cylinder 7 in the front-rear direction. The pre-blowing guide cylinder 7 is connected to the guide cylinder 2 through a direction adjusting assembly. By arranging the electronic wind generating unit at the air inlet end of the electronic wind blowing unit, the airflow is partially ionized in the high-intensity electric field before entering the guide cylinder 2, forming a plasma rich in active particles such as excited state molecules, ions, and free radicals. The pre-blowing guide cylinder 7 is fixed to the carburizing furnace body 1 through an insulating bracket.

[0071] The direction adjusting assembly comprises a hollow ball holder 8 fixed to the pre-air guide cylinder 7; the ball holder 8 is rotatably connected with a spherical joint 9; the spherical joint 9 is connected with the guide cylinder 2; the pre-air guide cylinder 7, the ball holder 8, the spherical joint 9 and the guide cylinder 2 are throughly connected to form an electronic wind airflow channel with adjustable direction. By adjusting the air outlet direction of the guide cylinder 2 through the cooperation of the ball holder 8 and the spherical joint 9, the guide cylinder 2 is directed towards the recessed part of the workpiece to be processed, and is away from the protruding and thin-walled parts of the workpiece to be processed, so that the propanol uniformly covers the recessed area of the workpiece, and prevents the thin-walled part from being over-carburized or deformed.

[0072] The ball holder 8 is provided with a bolt hole at the position covering the spherical joint 9, and a locking bolt is assembled in the bolt hole, and the end of the locking bolt is provided with a pressing block in contact with the spherical joint 9, and the pressing block is in contact with the outer surface of the spherical joint 9 to form a friction pair with adjustable pressure, and the staff manually rotates the adjusting screw to form a controllable pressure surface contact friction pair between the pressing block and the spherical joint 9.

[0073] The carburizing furnace body 1 is also provided with a high-voltage power supply; the pre-air positive electrode and the pre-air positive electrode 5 are connected to the positive electrode of the high-voltage power supply through a high-temperature-resistant metal bus; and the pre-air negative electrode 6 is connected to the negative electrode of the high-voltage power supply through a high-temperature-resistant metal bus.

[0074] The guide cylinder 2 is fixed with a connecting ring; the connecting ring is provided with a connecting rod; the carburizing furnace body 1 is hingedly connected with a furnace door; the connecting rod extends radially along the carburizing furnace body 1 to the vicinity of the furnace door; and the connecting rod cooperates with the guide cylinder 2 to form a manual deflection adjusting system. Through the cooperation of the connecting rod and the connecting ring, the staff can adjust the rotation angle of the guide cylinder 2 while standing at the furnace door position.

[0075] In use, the workpiece to be processed is placed on the carburizing furnace loading support and is connected to the carburizing furnace loading support through bolt locking, the negative electrode of the high-voltage power supply is connected to the carburizing furnace loading support, the staff adjusts the rotation angle of the guide cylinder 2 according to the surface shape of the complex workpiece, so that the guide cylinder 2 is directed towards the recessed area of the complex workpiece, and the pressing block is tightly pressed against the outer surface of the spherical joint, and at the same time, part of the core-pulling electrode 4 extends out of the guide cylinder 2, the core-pulling electrode 4 extending out covers the middle part of the recessed part, and the covering area is not less than 80% of the area of the recessed part and not less than 20% of the area of the recessed part, the core-pulling electrode 4 located in the middle part has the longest extension distance, and the core-pulling electrodes 4 around it have gradually decreasing extension distances, forming a convex simulation platform matched with the shape of the recessed part of the workpiece, the high-voltage power supply is turned on, and a direct current voltage is applied to the electronic wind generating unit and the electronic wind precision air supply unit to form a high-temperature directional jet flow towards the recessed part of the complex workpiece, thereby realizing uniform carburizing of the surface of the complex workpiece.

[0076] It should be noted that the above examples are only used to illustrate the technical solutions of the present application but not limit the present application. Although the present application is described in detail with reference to the preferred embodiments, those skilled in the art should understand that the technical solutions of the present application can be modified or equivalently replaced, without departing from the spirit and scope of the technical solutions of the present application, which should be covered in the scope of the claims of the present application.

Claims

1. A core-pulling electronic air system suitable for carburizing furnaces, comprising an electronic air system, said electronic air system including a high-voltage power supply and an electronic air supply unit, characterized in that: It also includes a carburizing furnace loading support for supporting the workpieces to be processed; The electronic air supply unit includes a positive air supply electrode, a negative air supply electrode, and a guide tube (2). A perforated plate (3) is fixed to the inner wall of the guide cylinder (2); The air outlet direction of the guide cylinder (2) is towards the recessed part of the workpiece to be processed; The positive air supply electrode includes at least three core-pulling electrodes (4), and the at least three core-pulling electrodes (4) are slidably disposed in the holes of the mesh plate (3); The core-pulling electrode (4) includes an electrode column (41), which is a hollow tube; The hollow tube has a flared opening at the rear end where the flow area increases from front to back. The hollow tube has a tapering structure at the front end, with the internal and external cross-sectional areas gradually decreasing (42). The opening of the closing structure (42) is called the through opening (43). A tungsten steel needle (44) is coaxially fixedly installed inside the closing structure (42). The large end of the tungsten carbide needle (44) is located inside the closing structure (42), and the small end of the tungsten carbide needle (44) is located outside the closing structure (42); There is a gap between the inner side of the closing structure (42) and the outer side of the tungsten steel needle (44) for airflow, which is called the guide gap; The closing structure (42) and the tungsten steel needle (44) form a core-pulling structure; The tungsten steel needle (44) has a pointed tip that gradually tapers from the large end to the small end. One part of the pointed tip is located inside the through-hole (43), and the other part is located outside the through-hole (43). The cone angle of the pointed tip is not greater than the cone angle of the closing structure (42), forming a fluid directional acceleration mechanism. The negative terminal of the high-voltage power supply is connected to the loading support of the carburizing furnace, with the fixed workpiece itself serving as the negative terminal for air supply.

2. The core-pulling electronic air system for carburizing furnaces according to claim 1, characterized in that: The closing structure (42) is provided with a bracket (45) to support the tungsten steel needle (44).

3. The core-pulling electronic air system for carburizing furnaces according to claim 2, characterized in that: The electrode post (41), tungsten carbide needle (44), and bracket (45) are all made of tungsten carbide.

4. The core-pulling electronic air system for carburizing furnaces according to claim 1, characterized in that: The sliding range of the core-pulling electrode (4) is such that the tip of the core-pulling electrode (4) extends out of the outlet of the guide cylinder (2) and retracts into the outlet of the guide cylinder (2); The tip displacement range of the core-pulling electrode (4) is 12mm outside the outlet of the guide tube (2) and 12mm inside the outlet of the guide tube (2). At least two of the core-pulling electrodes (4) extend out of the guide tube (2) such that the extended core-pulling electrodes (4) cover the middle of the recessed part, and the covered area is not greater than 80% of the area of ​​the recessed part and not less than 20% of the area of ​​the recessed part.

5. The core-pulling electronic air system for carburizing furnaces according to claim 4, characterized in that: The core-pulling electrode (4) located in the middle has the longest extension distance, while the extension distance of the core-pulling electrodes (4) around it gradually decreases.

6. The core-pulling electronic air system for carburizing furnaces according to claim 1, characterized in that: The electronic wind system also includes an electronic wind generation unit; The electronic wind generation unit includes a pre-air positive electrode (5), a pre-air negative electrode (6), and a pre-air guide tube (7). The pre-air supply positive electrode (5) and the pre-air supply negative electrode (6) are fixed in the pre-air supply guide tube (7) along the front and back direction; The pre-air delivery guide cylinder (7) and the guide cylinder (2) are connected by a directional assembly.

7. The core-pulling electronic air system for carburizing furnaces according to claim 6, characterized in that: The directional assembly includes a hollow ball support (8) fixed to the pre-air delivery guide tube (7). The ball support (8) is rotatably connected to a ball joint (9). The ball joint (9) is connected to the guide cylinder (2); The pre-supplied air guide tube (7), ball support (8), ball joint (9), and guide tube (2) are connected to form an electronic airflow channel with adjustable direction.

8. The core-pulling electronic air system for carburizing furnaces according to claim 7, characterized in that: The carburizing furnace also includes the carburizing furnace body (1); A high-voltage power supply is installed in the carburizing furnace body (1). The positive electrode for air supply and the positive electrode for pre-air supply (5) are connected to the positive electrode of the high-voltage power supply through a high-temperature resistant metal busbar; The pre-supply air negative electrode (6) is connected to the negative electrode of the high-voltage power supply through a high-temperature resistant metal busbar.

9. The core-pulling electronic air system for a carburizing furnace according to claim 8, characterized in that: A connecting ring is fixed to the outer wall of the guide cylinder (2); A connecting rod is fitted onto the connecting ring; The carburizing furnace body (1) is hinged to a furnace door; The connecting rod extends radially along the carburizing furnace body (1) to the area near the furnace door; The connecting rod and guide cylinder (2) form a manual deflection adjustment system.

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