Core-pulling type electronic wind system suitable for carburizing furnace

Abstract

The invention relates to the technical field of heat treatment, in particular to a core-pulling type electronic air system suitable for a carburizing furnace, which comprises an electronic air system, the electronic air system comprises a high-voltage power supply and an electronic air supply unit, and further comprises a carburizing furnace loading support for supporting a workpiece to be treated; the electronic air supply unit comprises an air supply anode, an air supply cathode and a guide cylinder; a mesh plate is fixed on the inner wall of the guide cylinder; the air outlet direction of the guide cylinder faces the concave part of the to-be-treated workpiece; the air supply positive electrode comprises at least three core-pulling electrodes, and the at least three core-pulling electrodes are arranged in holes of the mesh plate in a sliding mode. The electronic wind system is arranged in the carburizing furnace body, the electronic wind system forms a stream of ion wind which faces the concave part of the workpiece to be treated and flows directionally, high-temperature carburizing gas enters the concave part of the workpiece to be treated forcibly, and meanwhile waste gas is brought out; the problem that carburized layers of different parts of a complex workpiece in a carburizing furnace body are uneven in thickness is solved.

Description

Technical Field

[0001] The invention relates to the technical field of heat treatment, in particular to a core-pulling electronic wind system suitable for a carburizing furnace. Background Art

[0002] A carburizing furnace is a heat treatment equipment used for surface chemical heat treatment of metal workpieces. By infiltrating active carbon atoms into the surface of the workpiece, the carbon content of the surface layer of the workpiece is increased, thereby significantly improving its surface hardness and wear resistance, while maintaining good plasticity and toughness in the core of the workpiece.

[0003] During use, the workpiece to be processed is placed on the carburizing furnace loading support in the carburizing furnace, ensuring that there is an appropriate gap between the workpieces for gas circulation. The furnace door is sealed and heating is started. After the furnace temperature rises to the carburizing temperature (usually 920-930°C) and stabilizes, propane is introduced into the furnace. The propane decomposes to produce a large amount of active carbon atoms, which continuously penetrate into the surface of the workpiece and diffuse inward to form a carburized layer.

[0004] During the operation of a traditional carburizing furnace, the gas flow in the recessed areas of the workpiece (including deep holes, narrow slits, and grooves) is extremely poor, and fresh activated carbon atoms cannot be replenished in time. At the same time, gases such as hydrogen (H2) produced by the decomposition reaction will accumulate in the recesses. These waste gases will inhibit the continuation of the carburizing reaction, resulting in a shallow carburizing layer, low hardness, or even no carburizing at all in the recessed areas of the workpiece, affecting the heat treatment effect.

[0005] In order to solve the above problems, the carburizing time is extended during carburizing, but this will lead to the problem of excessively deep carburized layer in the exposed surface area. Summary of the Invention

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

[0007] In view of the problems existing in the above-mentioned prior art, the present invention is proposed. To solve the above-mentioned technical problems, the present invention provides the following technical solutions: A core-pulling electronic wind system suitable for a carburizing furnace comprises an electronic wind system including a high-voltage power supply and an electronic wind air supply unit, and a carburizing furnace loading support for supporting a workpiece to be processed; The electronic air supply unit includes an air supply positive electrode, an air supply negative electrode and a guide tube; A mesh plate is fixed on the inner wall of the guide cylinder; The air outlet direction of the guide cylinder is toward the concave part of the workpiece to be processed; The air supply positive electrode includes at least three core-pulling electrodes, and the at least three core-pulling electrodes are slidably arranged in the holes of the mesh plate; The core-pulling electrode comprises an electrode cylinder, which is a hollow tube; The rear end of the hollow tube is provided with a bell mouth that expands the flow area from front to back; The front end of the hollow tube is provided with a closing structure in which the internal and external cross-sectional areas are gradually reduced; The opening of the closing structure is called the outlet opening; A tungsten steel needle is coaxially fixedly assembled in the closing structure; The large end of the tungsten steel needle is located inside the closing structure, and the small end of the tungsten steel needle is located outside the closing structure; There is a gap between the inner side of the closing structure and the outer side of the tungsten steel needle for air flow, which is called a guide gap; The closing structure and the tungsten steel needle form a core-pulling structure; The tungsten steel needle has a tip portion that tapers gradually from a large end to a small end, a portion of the tip portion is located within the outlet opening, and another portion is located outside the outlet opening, and a cone angle of the tip portion is no greater than a cone angle of the closing structure, forming a fluid directional acceleration mechanism; The negative electrode of the high-voltage power supply is connected to the carburizing furnace loading support, and the fixed workpiece to be processed itself serves as the air supply negative electrode.

[0008] The above design places the electronic wind system in the carburizing furnace body, and the positive and negative gas supply electrodes form a high-voltage electric field to ionize the propane in the carburizing furnace, forming a directional flow of ion wind toward the recessed part of the workpiece to be processed, forcing the high-temperature carburizing gas to enter the recessed part of the workpiece to be processed, and at the same time taking out the reacted and less active waste gas, so that the carburizing reaction can proceed continuously and efficiently, and the surface of the workpiece to be processed is evenly carburized. Compared with the traditional process, the process cycle is shortened, or a thicker carburized layer can be obtained in the same time.

[0009] The core-pulling electrode constitutes an efficient fluid directional acceleration mechanism. The gas will be accelerated when passing through the gradually shrinking guide gap, which enhances the penetration and directionality of the airflow, making the airflow have the advantages of strong directionality, concentrated energy, and not easy to diffuse. It can more effectively penetrate into the deepest part of the workpiece concave part and further improve the carburizing uniformity of the workpiece surface.

[0010] The workpiece to be processed on the loading support of the carburizing furnace itself serves as a large-area negative air supply electrode, and cooperates with a small-area positive air supply electrode to establish an uneven high-voltage electric field, so that the concave part of the workpiece to be processed serves as the place with the highest electric field intensity. Under the action of the electric field, the airflow is accelerated and focused to form a high-speed jet. The high-speed jet moves along the direction of the electric field, that is, the direction of the concave part of the workpiece to be processed, realizing efficient, uniform, and high-quality local active carburizing of complex workpieces, and solving the problem of uneven carburized layer thickness in different parts of complex workpieces.

[0011] Preferably, a bracket is provided in the closing structure to support the tungsten steel needle.

[0012] Preferably, the electrode column, tungsten steel needle and bracket are all made of tungsten steel, so that the electrode column, tungsten steel needle and bracket have high temperature resistance, wear resistance and corrosion resistance, so as to facilitate long-term stable use in the carburizing furnace body with a processing temperature higher than 500°C.

[0013] 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 tube and is retracted into the outlet of the guide tube; the displacement range of the tip of the core-pulling electrode is that it extends 12 mm outside the outlet of the guide tube and is retracted 12 mm inside the outlet of the guide tube; at least two of the core-pulling electrodes extend out of the guide tube so that the extended core-pulling electrodes cover the middle part of the recessed part, and the covering 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 depressions or holes of different depths and diameters, the distance between the tip of the core-pulling electrode and the surface of the workpiece is adjusted so that the area with the strongest electric field and the highest airflow velocity is precisely positioned at the deepest position in the middle of the depression on the surface of the workpiece to be processed. The core-pulling electrode covers the middle position of the depression of the workpiece, and the coverage area is only between 20% and 80% of the depression area, so that there is enough high-speed jet to directly impact the middle position of the depression area of ​​the workpiece. After the high-speed jet hits the bottom of the middle position of the depression area, it will diffuse to the surroundings and flow upward along the side wall. It will not be discharged from the area not covered by the core-pulling electrode, and will not collide with the newly injected airflow to affect carburizing. It can be applied to different workpieces to be processed and improve the flexibility of carburizing treatment.

[0014] Preferably, the core-pulling electrode in the middle has the longest extension distance, while the extension distances of the surrounding core-pulling electrodes gradually decrease. The core-pulling electrodes extend out of the guide tube and are arranged in a gradient, with the longest electrode in the middle and gradually shorter electrodes at the periphery. This allows the core-pulling electrodes to form a convex platform that adapts to the shape of the workpiece's recessed area. This allows them to impact not only the deepest part of the workpiece's recessed area but also the sidewalls of the recessed area, further improving the uniformity of the carburized layer thickness.

[0015] Preferably, the electron wind system further includes an electron wind generation unit; the electron wind generation unit includes a pre-air positive electrode, a pre-air negative electrode, and a pre-air guide tube; the pre-air positive electrode and pre-air negative electrode are fixed in the pre-air guide tube along the front-to-back direction; the pre-air guide tube is connected to the guide tube via a direction adjustment assembly. By installing the electron wind generation unit at the air inlet end of the electron wind supply unit, the airflow is partially ionized in this high-intensity electric field before entering the guide tube, forming a plasma rich in active particles such as excited molecules, ions, and free radicals.

[0016] Preferably, the direction adjustment assembly includes a hollow ball holder fixed to the pre-air guide tube; the ball holder is rotatably connected to a ball joint; the ball joint is connected to the guide tube; the pre-air guide tube, the ball holder, the ball joint, and the guide tube's inner cavity are interconnected, forming a directionally adjustable electronic airflow channel. The ball holder and the ball joint cooperate to adjust the airflow direction of the guide tube so that the guide tube faces the recessed areas of the workpiece being processed and away from the protruding and thin-walled areas of the workpiece being processed.

[0017] Preferably, it further comprises a carburizing furnace body; a high-voltage power supply is assembled on the carburizing furnace body; the air supply positive electrode and the pre-air supply positive electrode are connected to the positive electrode of the high-voltage power supply via a high-temperature resistant metal busbar; The pre-air supply negative electrode is connected to the negative electrode of the high-voltage power supply through a high-temperature resistant metal busbar.

[0018] Preferably, a connecting ring is fixed to the outer wall of the guide cylinder; a connecting rod is mounted on the connecting ring; the carburizing furnace body is hingedly connected to the furnace door; the connecting rod extends radially along the carburizing furnace body to an area near the furnace door; and the connecting rod and the guide cylinder form a manual deflection adjustment system. The cooperation of the connecting rod and the connecting ring allows a worker to conveniently adjust the rotation angle of the guide cylinder while standing at the furnace door.

[0019] In summary, the present invention has the following beneficial effects: 1. By placing the electronic wind system inside the carburizing furnace, the problem of uneven carburizing of complex workpieces is solved. Multiple core-pulling electrodes are used to generate high-speed directional jets toward the recessed parts of the workpiece to be processed, so that the airflow rushes into the recessed areas of the workpiece to be processed and replaces the exhaust gas therein, shortening the process cycle and significantly reducing the consumption of process gas, thereby increasing the carburizing rate and efficiency and improving the uniformity of the carburized layer.

[0020] 2. The electronic wind system includes an electronic wind generation unit and an electronic wind supply unit. The electronic wind generation unit generates a stable high-speed airflow, and the electronic wind precision supply unit forms the high-speed airflow into a high-speed, directional jet, which is accurately injected into the most difficult-to-process recessed areas of the workpiece, thereby increasing the airflow intensity and directly injecting the airflow into the deepest part of the recessed part of the workpiece to be processed. It is suitable for different workpieces, improves flexibility, and further improves the uniformity of the carburized layer. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the following briefly introduces the drawings required for describing the embodiments. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be derived from these drawings without inventive work. Among them: Figure 1 This is a schematic diagram of the overall structure of the core-pulling electronic wind system suitable for a carburizing furnace according to the present invention; Figure 2 This is a structural schematic diagram of a carburizing furnace body of a core-pulling electronic wind system suitable for a carburizing furnace according to the present invention; Figure 3 This is a schematic structural diagram of a cross-section of a carburizing furnace body of a core-pulling electronic wind system suitable for a carburizing furnace according to the present invention; Figure 4 The figure is a schematic structural diagram of a cross-section of an electrode outer tube of a core-pulling electronic wind system suitable for a carburizing furnace according to the present invention.

[0022] In the figure, 1. carburizing furnace body; 2. guide tube; 3. mesh plate; 4. core-pulling electrode; 41. electrode cylinder; 42. closing structure; 43. through opening; 44. tungsten steel needle; 45. bracket; 5. pre-air positive electrode; 6. pre-air negative electrode; 7. pre-air guide tube; 8. ball holder; 9. spherical joint. DETAILED DESCRIPTION

[0023] In order to make the above-mentioned objects, features and advantages of the present invention more clearly understood, the specific embodiments of the present invention are described in detail below with reference to the accompanying drawings.

[0024] In the following description, many specific details are set forth to facilitate a full understanding of the present invention. However, the present invention may also be implemented in other ways different from those described herein. Those skilled in the art may make similar generalizations without violating the connotation of the present invention. Therefore, the present invention is not limited to the specific embodiments disclosed below.

[0025] Next, the present invention is described in detail with reference to schematic diagrams. For ease of illustration, when describing embodiments of the present invention, cross-sectional views illustrating device structures may be partially enlarged and not to scale. Furthermore, these schematic diagrams are merely illustrative and should not limit the scope of protection of the present invention. Furthermore, in actual production, three-dimensional dimensions, including length, width, and depth, should be included.

[0026] Furthermore, the term "one embodiment" or "embodiment" herein refers to a specific feature, structure, or characteristic that may be included in less than one implementation of the present invention. The phrase "in one embodiment" appearing in various places throughout this specification does not necessarily refer to the same embodiment, nor does it necessarily refer to a single embodiment or a selective embodiment that is mutually exclusive of other embodiments.

[0027] Example 1, reference Figures 1 to 4 , a core-pulling electronic wind system suitable for a carburizing furnace, comprising an electronic wind system, the electronic wind system comprising a high-voltage power supply and an electronic wind air supply unit, and a carburizing furnace loading support for supporting a workpiece to be processed; The electronic air supply unit includes an air supply positive electrode, an air supply negative electrode and a guide tube 2; A mesh plate 3 is fixed to the inner wall of the guide cylinder 2; The air outlet direction of the guide tube 2 is toward the concave part of the workpiece to be processed; The air supply positive electrode includes at least three core-pulling electrodes 4, and the at least three core-pulling electrodes 4 are slidably arranged in the holes of the mesh plate 3; The core-pulling electrode 4 includes an electrode column 41, which is a hollow tube; The rear end of the hollow tube is provided with a bell mouth that expands the flow area from front to back; The front end of the hollow tube is provided with a closing structure 42 with gradually decreasing internal and external cross-sectional areas; The opening of the closing structure 42 is called the outlet opening 43; A tungsten steel needle 44 is coaxially fixedly assembled in the closing structure 42; The large end of the tungsten steel needle 44 is located inside the closing structure 42, and the small end of the tungsten steel 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 air flow, which is called a guide gap; The closing structure 42 and the tungsten steel needle 44 form a core-pulling structure; The tungsten steel needle 44 has a tip portion that tapers gradually from a large end to a small end. A portion of the tip portion is located inside the outlet opening 43, while another portion is located outside the outlet opening 43. The cone angle of the tip portion is no greater than the cone angle of the closing structure 42, thereby forming a fluid directional acceleration mechanism. The negative pole of the high-voltage power supply is connected to the loading support of the carburizing furnace, and the fixed workpiece to be processed itself serves as the negative pole of the air supply.

[0028] In this embodiment, the electronic wind system is arranged in the carburizing furnace body 1, and the positive gas supply electrode and the negative gas supply electrode form a high-voltage electric field to ionize the propane in the carburizing furnace, forming a directional flow of ion wind toward the recessed part of the workpiece to be processed, forcing the high-temperature carburizing gas to enter the recessed part of the workpiece to be processed, and at the same time taking out the reacted and less active waste gas, so that the carburizing reaction can be carried out continuously and efficiently, and the surface of the workpiece to be processed is evenly carburized. Compared with the traditional process, the process cycle is shortened, or a thicker carburized layer can be obtained in the same time.

[0029] The core-pulling electrode 4 constitutes an efficient fluid directional acceleration mechanism. A bell mouth is provided at the rear end of the hollow tube to increase 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 shrinking guide gap, thereby enhancing the penetration and directionality of the airflow, making the airflow have the advantages of strong directionality, concentrated energy, and not easy to diffuse. It can more effectively penetrate into the deepest part of the concave part of the workpiece, further improving the carburizing uniformity of the workpiece surface.

[0030] The negative air supply electrode is connected to the carburizing furnace loading support, so that the workpiece to be processed on the carburizing furnace loading support itself serves as a large-area negative air supply electrode, and cooperates with the small-area positive air supply electrode to establish an uneven high-voltage electric field, so that the depressed part of the workpiece to be processed serves as the place with the highest electric field intensity. Under the action of the electric field, the airflow is accelerated and focused to form a high-speed jet, and the high-speed jet moves along the direction of the electric field, that is, the direction of the depressed part of the workpiece to be processed, thereby realizing efficient, uniform, and high-quality local active carburizing of complex workpieces, and solving the problem of uneven carburized layer thickness in different parts of complex workpieces.

[0031] A bracket 45 is provided in the closing structure 42 , and the tungsten steel needle 44 is supported by the bracket 45 .

[0032] The electrode column 41, tungsten steel needle 44, and bracket 45 are all made of tungsten steel. These components are heat-resistant, wear-resistant, and corrosion-resistant, allowing for long-term, stable use within the carburizing furnace body 1 at temperatures exceeding 500°C.

[0033] The sliding range of the core-pulling electrode 4 is that the tip of the core-pulling electrode 4 extends out of the outlet of the guide tube 2 and is retracted into the outlet of the guide tube 2; the displacement range of the tip of the core-type needle electrode is 12 mm outside the outlet of the guide tube 2 and 12 mm inside the outlet of the guide tube 2; at least two core-pulling electrodes 4 extend out of the guide tube 2 so that the extended core-pulling electrodes 4 cover the middle part of the recessed part, and the covering 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 depressions or holes of different depths and diameters, the distance between the tip of the core-pulling 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 precisely positioned at the deepest position in the middle of the depression on the surface of the workpiece to be processed. The core-pulling electrode 4 covers the middle position of the depression of the workpiece, and the coverage area is only between 20% and 80% of the depression area, so that there is enough high-speed jet to directly impact the middle position of the depression area of ​​the workpiece. After the high-speed jet hits the bottom of the middle position of the depression area, it will diffuse to the surroundings and flow upward along the side wall. It will not be discharged from the area not covered by the core-pulling electrode 4, and will not collide with the newly injected airflow to affect carburizing. It can be applied to different workpieces to be processed, thereby improving the flexibility of carburizing treatment.

[0034] The core-pulling electrode 4 in the middle extends the longest, while the extension distances of the surrounding core-pulling electrodes 4 gradually decrease. Several core-pulling electrodes 4 extend out of the guide tube 2, and are arranged in a gradient with the longest portion in the middle and gradually shortened at the periphery. This allows the core-pulling electrodes 4 to form a convex imitation platform that adapts to the shape of the workpiece's concave portion. This allows them to impact not only the deepest part of the workpiece's concave portion, but also the sidewalls of the concave portion, further improving the uniformity of the carburized layer thickness.

[0035] The electron wind system also includes an electron wind generation unit, which includes a pre-air positive electrode 5, a pre-air negative electrode 6, and a pre-air guide tube 7. The pre-air positive electrode 5 and the pre-air negative electrode 6 are fixed in the pre-air guide tube 7 along the front-to-back direction. The pre-air guide tube 7 is connected to the guide tube 2 via a direction adjustment assembly. By installing the electron wind generation unit at the air inlet end of the electron wind supply unit, the airflow is partially ionized in this high-intensity electric field before entering the guide tube 2, forming a plasma rich in active particles such as excited molecules, ions, and free radicals. The pre-air guide tube 7 is fixed to the carburizing furnace body 1 via an insulating bracket.

[0036] The direction adjustment assembly includes a hollow ball holder 8 fixed to the pre-air guide tube 7. Ball holder 8 is rotatably connected to a ball joint 9, which is connected to the guide tube 2. The pre-air guide tube 7, ball holder 8, ball joint 9, and guide tube 2 intersect, forming a directionally adjustable electron air flow channel. The coordination of ball holder 8 and ball joint 9 adjusts the air flow direction of guide tube 2, directing it toward the recessed areas of the workpiece being processed and away from protruding and thin-walled areas. This allows the propanol to evenly coat the recessed areas of the workpiece and prevent over-carburization or deformation of thin-walled parts.

[0037] The ball holder 8 has a bolt hole at the position covering the spherical joint 9, and a locking bolt is installed in the bolt hole. The end of the locking bolt is provided with a pressure block that contacts the spherical joint 9. The pressure block contacts the outer surface of the spherical joint 9 to form a friction pair with adjustable pressure. The staff manually rotates the adjusting screw to form a surface contact friction pair with controllable pressure between the pressure block and the spherical joint 9.

[0038] It also includes a carburizing furnace body 1; a high-voltage power supply is assembled on the carburizing furnace body 1; the air supply positive electrode and the pre-air supply positive electrode 5 are connected to the positive electrode of the high-voltage power supply through a high-temperature resistant metal busbar; the pre-air supply negative electrode 6 is connected to the negative electrode of the high-voltage power supply through a high-temperature resistant metal busbar.

[0039] A connecting ring is fixed to the outer wall of the guide cylinder 2; a connecting rod is mounted on the connecting ring. The furnace body 1 is hingedly connected to the furnace door. The connecting rod extends radially along the furnace body 1 to the area near the furnace door. The connecting rod and the guide cylinder 2 form a manual deflection adjustment system. The combination of the connecting rod and the connecting ring allows operators to adjust the rotation angle of the guide cylinder 2 while standing at the furnace door.

[0040] During use, the workpiece to be processed is placed on the loading support of the carburizing furnace and is fastened to the loading support of the carburizing furnace by bolts. The negative pole of the high-voltage power supply is connected to the loading support of the carburizing furnace. According to the surface shape of the complex workpiece, the staff adjusts the rotation angle of the guide cylinder 2 so that the guide cylinder 2 faces the recessed area of ​​the complex workpiece, and the pressure block is pressed against the outer surface of the spherical joint. At the same time, part of the core-pulling electrode 4 is extended out of the guide cylinder 2 so that the extended core-pulling electrode 4 covers the middle part of the recessed part, and the covering area is not more 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 has the longest extension distance, and the extension distances of the surrounding core-pulling electrodes 4 gradually decrease, forming a convex imitation platform adapted to the shape of the recessed part of the workpiece. Turn on the high-voltage power supply, and apply DC voltage to the electron wind generation unit and the electron wind precision air supply unit to form a high-temperature, directional jet facing the recessed part of the complex workpiece, thereby achieving uniform carburizing on the surface of the complex workpiece.

[0041] It should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention and are not intended to limit the present invention. Although the present invention has been described in detail with reference to the preferred embodiments, those skilled in the art should understand that the technical solutions of the present invention may be modified or replaced by equivalents without departing from the spirit and scope of the technical solutions of the present invention, which should all be included in the scope of the claims of the present invention.

Claims

1. A core-pulling electronic wind system suitable for a carburizing furnace, comprising an electronic wind system including a high-voltage power supply and an electronic wind supply unit, characterized in that: Also included is a carburizing furnace loading support for supporting a workpiece to be processed; The electronic air supply unit comprises an air supply positive electrode, an air supply negative electrode and a guide tube (2); A mesh plate (3) is fixed to the inner wall of the guide cylinder (2); The air outlet direction of the guide cylinder (2) is toward the concave portion of the workpiece to be processed; The air supply positive electrode comprises 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) comprises an electrode column (41), and the electrode column (41) is a hollow tube; The rear end of the hollow tube is provided with a bell mouth that expands the flow area from front to back; The front end of the hollow tube is provided with a closing structure (42) with gradually decreasing internal and external cross-sectional areas; The opening of the closing structure (42) is called the outlet opening (43); A tungsten steel needle (44) is coaxially fixedly assembled in the closing structure (42); The large end of the tungsten steel needle (44) is located inside the closing structure (42), and the small end of the tungsten steel 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 air flow, which is called a guide gap; The closing structure (42) and the tungsten steel needle (44) form a core-pulling structure; The tungsten steel needle (44) has a tip portion that tapers gradually from a large end to a small end, a portion of the tip portion is located inside the outlet opening (43), and another portion is located outside the outlet opening (43), and a cone angle of the tip portion is no greater than a cone angle of the closing structure (42), forming a fluid directional acceleration mechanism; The negative electrode of the high-voltage power supply is connected to the carburizing furnace loading support, and the fixed workpiece to be processed itself serves as the air supply negative electrode.

2. The core-pulling electronic wind system suitable for a carburizing furnace according to claim 1, characterized in that: A bracket (45) is provided in the closing structure (42), and the tungsten steel needle (44) is supported by the bracket (45).

3. The core-pulling electronic wind system suitable for a carburizing furnace according to claim 2, characterized in that: The electrode column (41), tungsten steel needle (44), and bracket (45) are all made of tungsten steel.

4. The core-pulling electronic wind system suitable for a carburizing furnace according to claim 1, characterized in that: The sliding range of the core-pulling electrode (4) is that the tip of the core-pulling electrode (4) extends out of the outlet of the guide tube (2) and is retracted into the outlet of the guide tube (2); The tip displacement range of the core-pulling electrode (4) is 12 mm extending outward from the outlet of the guide tube (2) and 12 mm retracted into the outlet of the guide tube (2); At least two of the core-pulling electrodes (4) extend out of the guide tube (2), so that the extended core-pulling electrodes (4) cover the middle of the recessed portion, and the covering area is no greater than 80% of the recessed portion and no less than 20% of the recessed portion.

5. The core-pulling electronic wind system suitable for a carburizing furnace according to claim 4, characterized in that: The core-pulling electrode (4) located in the middle has the longest extension distance, and the extension distances of the core-pulling electrodes (4) in the surrounding areas gradually decrease.

6. The core-pulling electronic wind system suitable for a carburizing furnace according to claim 1, characterized in that: The electron wind system further includes an electron wind generating unit; The electron wind generating unit comprises a pre-air supply positive electrode (5), a pre-air supply negative electrode (6) and a pre-air supply 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-back direction; The pre-air supply guide cylinder (7) is connected to the guide cylinder (2) via a direction adjustment component.

7. The core-pulling electronic wind system suitable for a carburizing furnace according to claim 6, characterized in that: The direction adjustment component includes a hollow ball holder (8) fixed to the pre-air supply guide cylinder (7); The ball holder (8) is rotatably connected to a spherical joint (9); The spherical joint (9) is connected to the guide cylinder (2); The inner cavities of the pre-air supply guide tube (7), the ball holder (8), the spherical joint (9), and the guide tube (2) are connected to form an electronic air flow channel with adjustable direction.

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

9. The core-pulling electronic wind system suitable 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); The connecting ring is equipped with a connecting rod; The carburizing furnace body (1) is hingedly connected to a furnace door; The connecting rod extends radially along the carburizing furnace body (1) to an area near the furnace door; The connecting rod cooperates with the guide cylinder (2) to form a manual deflection adjustment system.

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