Electric heating device for pit-type nitriding furnace

Abstract

The application discloses an electric heating device of a pit type nitriding furnace, relates to the technical field of electric heating of the pit type nitriding furnace, and discloses an electric heating device of a pit type nitriding furnace, which comprises a processing box used for heating treatment of the pit type nitriding furnace, a plurality of heat dissipation holes for heat dissipation during the heating treatment are formed in the processing box, the pit type nitriding furnace comprises a furnace body, the processing box is installed on the outer side of the furnace body, and the inner side of the furnace body is provided with a heating cavity used for heating treatment. The electric heating component is used for assisting electric heating operation of the pit type nitriding furnace, and the supporting component is used for supporting the electric resistance wire during the operation. Through the supporting action of the electric resistance wire, the electric resistance wire is prevented from drooping during electric heating, the probability of fuse blowing or fire caused by local current overload during the electric resistance wire heating operation is reduced, and stable electric heating operation of the pit type nitriding furnace is ensured.

Description

Technical Field

[0001] This invention relates to the field of electric heating technology for pit-type nitriding furnaces, specifically to an electric heating device for pit-type nitriding furnaces. Background Technology

[0002] The commonly used electric heating methods in pit-type nitriding furnaces mainly include resistance heating, induction heating, and far-infrared heating. Resistance heating generates Joule heat by passing current through a resistance wire, converting electrical energy into heat energy. This heat energy is then used to heat the atmosphere and workpiece inside the furnace through radiation, conduction, and convection. It has advantages such as simple structure, low cost, precise temperature control, high thermal efficiency, and strong applicability.

[0003] When using resistance wires to electrically heat the interior of a pit-type nitriding furnace, the resistance wires are subjected to stress (self-weight and thermal expansion stress) at high temperatures (typically 500-650℃). This stress causes creep, a slow plastic deformation resulting from grain slippage and grain boundary migration. Over time, this deformation accumulates, eventually causing the resistance wires to sag. When multiple parallel resistance wires inside the pit-type nitriding furnace sag, the distance between adjacent wires decreases, and they may even overlap, causing local current overload, leading to melting or fire, and affecting the stable electric heating operation of the pit-type nitriding furnace. To address this, we propose an electric heating device for pit-type nitriding furnaces. Summary of the Invention

[0004] The purpose of this invention is to provide an electric heating device for a pit-type nitriding furnace to solve the problems mentioned in the background art.

[0005] To achieve the above objectives, the present invention provides the following technical solution: an electric heating device for a pit-type nitriding furnace, comprising a processing box for heating the pit-type nitriding furnace, wherein the processing box has multiple sets of heat dissipation holes for heat dissipation during the heating process, the pit-type nitriding furnace includes a furnace body, the processing box is installed on the outside of the furnace body, and a heating chamber for heating is provided on the inside of the furnace body, further comprising: An electric heating component is installed between the heating chamber and the processing box for electric heating treatment inside the heating chamber; A support assembly, located between the heating chamber and the processing box, is used to support the electric heating assembly during use; In addition, a control component for controlling the support force during the support process and an identification component for identifying the support status are provided on the support component.

[0006] Preferably, multiple sets of the electric heating components are provided on the heating chamber and the processing box, and the multiple sets of electric heating components are arranged vertically. By adopting the above technical solutions, heating efficiency and heating effect are guaranteed.

[0007] Preferably, the electric heating assembly includes a resistance wire disposed inside the heating chamber, with both ends of the resistance wire passing through the furnace body to the interior of the processing box and fixed with conductive connectors. By adopting the above technical solution, the interior of the pit-type nitriding furnace is electrically heated.

[0008] Preferably, the support assembly includes a mounting cylinder, which is rotatably connected to the furnace body and the processing box. Multiple sets of support rods are fixed on the mounting cylinder for abutting against the inner side of the resistance wire, and each set of support rods is located inside the heating chamber. By adopting the above technical solution, the resistance wire is supported during the operation.

[0009] Preferably, the control component includes a drive rod centrally located inside the mounting cylinder, a drive assembly for driving the drive rod is located on the outside of the processing box, a blocking assembly for limiting the rotation of the mounting cylinder after rotation is located on the outside of the processing box, multiple sets of fixing blocks are fixed inside the mounting cylinder, a fixing ring is fixed on the fixing block, and the mounting cylinder, drive rod and fixing ring are concentrically arranged, a slider is fixed on the outside of the drive rod, the slider has a sliding hole, and the slider is slidably connected to the fixing ring under the action of the sliding hole, a first spring is sleeved on the outside of the fixing ring, and the two ends of the first spring abut against the fixing block and the slider respectively; By adopting the above technical solution, the support rod on the mounting cylinder is pushed to abut against the inner side of the resistance wire with greater force, ensuring the support effect of the resistance wire. During the elastic support process, as the relative rotation between the drive rod and the support rod increases, the first spring pushes the support rod against the inner side of the resistance wire with greater elastic force through the squeezing transmission action, which makes it easier to control the support force.

[0010] Preferably, the identification component includes a pointer fixed to the drive rod, and a scale for identifying the relative rotation amplitude between the mounting cylinder and the drive rod is fixed to the outside of the mounting cylinder; By adopting the above technical solution, it is easy to identify the support force of the resistance wire in real time, so as to avoid both insufficient support force affecting the support effect and excessive support force causing deformation of the resistance wire, thus ensuring the normal and stable electric heating operation of the resistance wire.

[0011] Preferably, the drive assembly includes a worm gear fixed to one end of the drive rod, a worm is provided on the outside of the processing box, the worm gear and the worm are meshed with each other, and a rotating assembly for rotating the worm is installed on the outside of the processing box. By adopting the above technical solution and using the drive component, it is easy to drive the drive rod.

[0012] Preferably, the rotating assembly includes a mounting bracket fixed to the outside of the processing box, a rotating shaft rotatably connected to the mounting bracket, a worm gear fixed in the center on the rotating shaft, and a drive pin fixed to one end of the rotating shaft; By adopting the above technical solution, the worm gear can be easily rotated through the rotating component.

[0013] Preferably, the blocking assembly includes a mounting base fixed to the outside of the mounting cylinder, a baffle connected to the mounting base via a telescopic assembly, and multiple sets of baffles for blocking against the baffles arranged in a circular array on the outside of the mounting cylinder, one end of the baffle is fixed to the processing box, and a transmission inclined surface for blocking against the baffle is provided on one side of the baffle. By adopting the above technical solution, the rotating baffle and mounting cylinder are blocked, preventing the mounting cylinder from resetting under the action of force. By restricting the resetting of the mounting cylinder, the support rod on the mounting cylinder can effectively abut against the inside of the resistance wire, ensuring the stable use of the support assembly.

[0014] Preferably, the telescopic assembly includes multiple sets of sleeves fixed on the mounting base, with a sliding rod slidably connected to each sleeve. One end of the sliding rod is fixed to a baffle. A second spring is sleeved on the outside of each sleeve, and the two ends of the second spring are respectively connected to the mounting base and the baffle. By adopting the above technical solution, it is convenient to stabilize the extension and retraction of the auxiliary baffle and to reset it after extension and retraction.

[0015] Compared with the prior art, the beneficial effects of the present invention are: This invention uses an electric heating component to assist in the electric heating operation of a pit-type nitriding furnace, and in conjunction with a support component, supports the resistance wire during the operation. By supporting the resistance wire, the drooping of the resistance wire during the electric heating process is prevented, reducing the probability of melting or fire caused by local current overload during the heating operation, and ensuring stable electric heating operation of the pit-type nitriding furnace. In this invention, during the process of supporting the resistance wire to prevent it from falling, the support component is pressurized by the control and identification components to ensure the support effect. During the entire pressurization process, the force of the support rod against the inner side of the resistance wire increases synchronously with the increase of the pointer's rotation on the dial. This facilitates real-time identification of the support force on the resistance wire, thus avoiding both insufficient support force affecting the support effect and excessive support force causing deformation of the resistance wire, ensuring normal and stable electric heating operation of the resistance wire. Attached Figure Description

[0016] Figure 1 This is a schematic diagram of the overall external structure of the present invention; Figure 2This is a schematic diagram of the internal structure of the processing box of the present invention; Figure 3 This is a schematic diagram of the internal structure of the heating cavity of the present invention; Figure 4 This is a schematic diagram showing the state of the resistance wire after installation according to the present invention; Figure 5 This is a schematic diagram of the electric heating component and support component of the present invention; Figure 6 This is a schematic diagram of the support assembly of the present invention supporting the resistance wire. Figure 7 This is a schematic diagram of the identification component state structure when there is no relative rotation between the mounting cylinder and the drive rod according to the present invention. Figure 8 This is a schematic diagram of the identification component state after relative rotation between the mounting cylinder and the drive rod according to the present invention; Figure 9 This is a schematic diagram of the control component and identification component of the present invention; Figure 10 This is a schematic diagram of the drive assembly and rotation assembly of the present invention; Figure 11 This is a schematic diagram of the blocking assembly state before the mounting cylinder rotates according to the present invention; Figure 12 This is a schematic diagram of the blocking assembly state after the mounting cylinder of the present invention is rotated; Figure 13 This is a schematic diagram of the support component of the present invention before and after rotation.

[0017] In the diagram: 101, furnace body; 102, heating chamber; 201, processing box; 202, heat dissipation hole; 301, resistance wire; 302, conductive connector; 401, mounting cylinder; 402, support rod; 501, drive rod; 502, fixing block; 503, fixing ring; 504, slider; 505, sliding hole; 506, first spring; 601, pointer; 602, dial; 701, worm gear; 702, worm; 801, mounting bracket; 802, rotating shaft; 803, drive pin; 901, mounting base; 902, baffle; 903, stop bar; 904, inclined plane; 1001, sleeve; 1002, sliding rod; 1003, second spring. Detailed Implementation

[0018] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0019] Example 1, please refer to Figures 1-13 The diagram shows an electric heating device for a pit-type nitriding furnace, including a processing box 201 for heating the pit-type nitriding furnace. The processing box 201 has multiple sets of heat dissipation holes 202 for heat dissipation during the heating process. The pit-type nitriding furnace includes a furnace body 101, with the processing box 201 installed on the outside of the furnace body 101. A heating chamber 102 for heating is provided on the inside of the furnace body 101. The device also includes: An electric heating component is disposed between the heating chamber 102 and the processing box 201 for electric heating treatment inside the heating chamber 102; A support assembly is disposed between the heating chamber 102 and the processing box 201 to support the electric heating assembly during use; In addition, a control component for controlling the support force during the support process and an identification component for identifying the support status are provided on the support component; It should be noted here that: the electric heating component is used to assist in the electric heating operation of the pit-type nitriding furnace, and in conjunction with the support component, the resistance wire 301 is supported during the operation. By supporting the resistance wire 301, the drooping of the resistance wire 301 during the electric heating process is prevented, reducing the probability of the resistance wire 301 melting or fire due to local current overload during the heating operation, and ensuring stable electric heating operation of the pit-type nitriding furnace. During the process of supporting the resistance wire 301 to prevent it from falling, the control and identification components apply pressure to the support component to ensure its effectiveness. Throughout the process of applying pressure to the support component, the force of the support rod 402 against the inner side of the resistance wire 301 increases synchronously with the increase of the rotation amplitude of the pointer 601 on the dial 602. This facilitates real-time identification of the support force on the resistance wire 301, ensuring that insufficient support force on the resistance wire 301 does not affect the support effect, while excessive support force does not cause deformation of the resistance wire 301, thus ensuring the normal and stable electric heating operation of the resistance wire 301.

[0020] Preferably, multiple sets of electric heating components are provided on the heating chamber 102 and the processing box 201, and the multiple sets of electric heating components are arranged vertically. It should be noted here that multiple sets of electric heating components are used to ensure heating efficiency and heating effect.

[0021] Preferably, the electric heating assembly includes a resistance wire 301 disposed inside the heating chamber 102, with both ends of the resistance wire 301 passing through the furnace body 101 to the interior of the processing box 201 and fixed with conductive connectors 302. It should be noted here that when the conductive connectors 302 at both ends of the resistance wire 301 are connected to electricity, the current flows through the resistance wire 301 to generate Joule heat, converting electrical energy into heat energy. The heat energy is then conducted to heat the atmosphere and workpiece inside the heating furnace.

[0022] Preferably, the support assembly includes a mounting cylinder 401, which is rotatably connected to the furnace body 101 and the processing box 201. Multiple sets of support rods 402 are fixed on the mounting cylinder 401 for abutting against the inner side of the resistance wire 301, and each set of support rods 402 is located inside the heating chamber 102. It should be noted that during the operation of the electric heating assembly, the drive rod 501 rotates inside the mounting cylinder 401 by rotating the assembly and the drive assembly. During the rotation of the drive rod 501, the mounting cylinder 401 is driven to rotate by the connection of the slider 504, the first spring 506 and the fixing block 502. During the rotation of the mounting cylinder 401, the support rod 402 on the mounting cylinder 401 passes through the pitch gap of the resistance wire 301 and abuts against the inner top of the resistance wire 301. Through the abutment between the support rod 402 and the inner top of the resistance wire 301, the resistance wire 301 is supported during the operation.

[0023] Preferably, the control component includes a drive rod 501 centrally located inside the mounting cylinder 401, a drive assembly for driving the drive rod 501 on the outside of the processing box 201, a blocking assembly for limiting the rotation of the mounting cylinder 401 after rotation on the outside of the processing box 201, multiple sets of fixing blocks 502 fixed inside the mounting cylinder 401, fixing rings 503 fixed on the fixing blocks 502, and the mounting cylinder 401, drive rod 501 and fixing rings 503 are concentrically arranged, a slider 504 is fixed on the outside of the drive rod 501, a sliding hole 505 is provided on the slider 504, and the slider 504 is slidably connected to the fixing ring 503 under the action of the sliding hole 505, and a first spring 506 is sleeved on the outside of the fixing ring 503, with the two ends of the first spring 506 abutting against the fixing block 502 and the slider 504 respectively; It should be noted here that: after the rotation of the drive rod 501 causes the support rod 402 on the mounting cylinder 401 to abut against the inner side of the resistance wire 301, with the continued rotation of the drive rod 501 and the rotational limiting effect of the resistance wire 301 on the support rod 402 and the mounting cylinder 401, relative rotation occurs between the drive rod 501 and the support rod 402. During the relative rotation, the drive rod 501 drives the slider 504 to slide on the fixed ring 503 and compress the first spring 506. The first spring 506 compresses... After pressing, the fixed block 502 and the mounting cylinder 401 generate elastic force. Through the elastic force, the support rod 402 on the mounting cylinder 401 is pushed to abut against the inner side of the resistance wire 301 with greater force, ensuring the support effect of the resistance wire 301. During the elastic support process, as the relative rotation amplitude between the drive rod 501 and the support rod 402 increases, the first spring 506 pushes the support rod 402 against the inner side of the resistance wire 301 with greater elastic force through the compression transmission action, which facilitates the control of the support force.

[0024] Preferably, the identification component includes a pointer 601 fixed to the drive rod 501, and a scale 602 fixed to the outside of the mounting cylinder 401 for identifying the relative rotation amplitude between the mounting cylinder 401 and the drive rod 501. It should be noted that during the entire process of pressurizing and supporting the support component, the supporting force between the support rod 402 and the inner side of the resistance wire 301 increases synchronously as the pointer 601 rotates on the dial 602. This facilitates real-time identification of the supporting force on the resistance wire 301, ensuring that insufficient supporting force on the resistance wire 301 does not affect the supporting effect, while excessive supporting force does not cause deformation of the resistance wire 301, thus guaranteeing the normal and stable electric heating operation of the resistance wire 301.

[0025] Preferably, the drive assembly includes a worm gear 701 fixed to one end of the drive rod 501, a worm 702 is provided on the outside of the processing box 201, the worm gear 701 and the worm 702 are meshed with each other, and a rotating assembly for rotating the worm 702 is installed on the outside of the processing box 201. It should be noted here that: by rotating the assembly, the worm 702 is rotated, and during the rotation of the worm 702, the drive rod 501 is rotated through the meshing transmission between the worm 702 and the worm wheel 701.

[0026] Preferably, the rotating assembly includes a mounting bracket 801 fixed to the outside of the processing box 201, a rotating shaft 802 rotatably connected to the mounting bracket 801, a worm gear 702 centrally fixed to the rotating shaft 802, and a drive pin 803 fixed to one end of the rotating shaft 802. It should be noted here that the drive pin 803 drives the rotating shaft 802 and the worm gear 702 on the rotating shaft 802 to rotate.

[0027] Example 2, please refer to Figures 11-13 This embodiment further illustrates embodiment 1. The blocking assembly in Figure 11 includes a mounting base 901 fixed to the outside of the mounting cylinder 401. A baffle 902 is connected to the mounting base 901 via a telescopic assembly. Multiple sets of baffles 903 are arranged in a circular array on the outside of the mounting cylinder 401 to block the baffles 902. One end of the baffle 903 is fixed to the processing box 201. A transmission inclined surface 904 for blocking the baffles 903 is provided on one side of the baffle 902. It should be noted that during the rotation of the mounting cylinder 401, the connection between the mounting base 901 and the telescopic component drives the baffle 902 to move synchronously. During the movement of the baffle 902, the inclined surface 904 on the baffle 902 abuts against each set of stop bars 903 during the movement. During the abutting process, through the abutting transmission action between the stop bars 903 and the inclined surface 904, the baffle 902 is forced to retract towards the mounting base 901. This retraction facilitates the baffle 902 passing over the stop bars 903. After the mounting cylinder 401 rotates, the abutting action between the back of the baffle 902 and the corresponding stop bars 903 blocks the rotated baffle 902 and the mounting cylinder 401, preventing the rotated mounting cylinder 401 from resetting under the action of force. By restricting the resetting of the mounting cylinder 401, the support rod 402 on the mounting cylinder 401 can remain effectively abutted against the inner side of the resistance wire 301, ensuring the stable use of the support component.

[0028] Preferably, the telescopic assembly includes multiple sets of sleeves 1001 fixed on the mounting base 901, a slide rod 1002 slidably connected to the sleeve 1001, one end of the slide rod 1002 being fixed to the baffle 902, and a second spring 1003 being sleeved on the outside of the sleeve 1001, with both ends of the second spring 1003 being connected to the mounting base 901 and the baffle 902 respectively. It should be noted that: the multiple sets of sleeves 1001 and slide rods 1002 facilitate the telescopic connection between the auxiliary baffle 902 and the mounting base 901, and the second spring 1003 facilitates the reset of the baffle 902 after movement.

[0029] In this solution: an electric heating device for a pit-type nitriding furnace includes the following steps: When the pit-type nitriding furnace is in use, it is electrically heated by an electric heating component. During operation, the electric heating component installs a resistance wire 301 inside the heating chamber 102. After installation, the conductive connectors 302 at both ends of the resistance wire 301 are connected to the power supply. During the connection process, the current flows through the resistance wire 301 to generate Joule heat, converting electrical energy into heat energy. The heat energy is then conducted to heat the atmosphere and workpiece inside the furnace. During the operation of the electric heating assembly, the drive rod 501 rotates inside the mounting cylinder 401 by rotating the assembly and the drive assembly. As the drive rod 501 rotates, the mounting cylinder 401 rotates due to the connection between the slider 504, the first spring 506, and the fixing block 502. During the rotation of the mounting cylinder 401, the support rod 402 on the mounting cylinder 401 passes through the pitch gap of the resistance wire 301 and abuts against the inner top of the resistance wire 301 (see...). Figure 6 and Figure 13 The support rod 402 abuts against the inner top of the resistance wire 301, supporting the resistance wire 301 during operation. This support prevents the resistance wire 301 from sagging during electric heating, reducing the likelihood of melting or fire due to localized current overload, and ensuring stable electric heating of the pit-type nitriding furnace. The rotation of the drive rod 501 causes the support rod 402 on the mounting cylinder 401 to abut against the inner side of the resistance wire 301. As the drive rod 501 continues to rotate and the resistance wire 301 limits the rotation of the support rod 402 and the mounting cylinder 401, relative rotation occurs between the drive rod 501 and the support rod 402. During this relative rotation, the drive rod 501 drives the slider 504 to slide on the fixed ring 503 and compress the first spring 506. After compression, the first spring 506 generates elastic force on the fixed block 502 and the mounting cylinder 401. Through this elastic force, the support rod 402 on the mounting cylinder 401 is pushed with greater force. The support rod 501 abuts against the inner side of the resistance wire 301, ensuring effective support. During the elastic support process, as the relative rotation between the drive rod 501 and the support rod 402 increases, the first spring 506, through compression transmission, pushes the support rod 402 against the inner side of the resistance wire 301 with greater elasticity. When the drive rod 501 and the support rod 402 rotate relative to each other, the pointer 601 rotates on the dial 602, and as the relative rotation continues, the pointer 601 continues to rotate. The pointer 601 rotates synchronously on the dial 602. Therefore, during the entire process of pressurizing and supporting the support component, the force of the support rod 402 and the inner side of the resistance wire 301 against each other increases synchronously as the pointer 601 rotates on the dial 602. This facilitates real-time identification of the support force on the resistance wire 301, ensuring that insufficient support force on the resistance wire 301 does not affect the support effect, and that excessive support force does not cause deformation of the resistance wire 301, thus ensuring normal and stable electric heating operation of the resistance wire 301. During the rotation of the mounting cylinder 401, the connection between the mounting base 901 and the telescopic component drives the baffle 902 to move synchronously. During the movement of the baffle 902, the inclined surface 904 on the baffle 902 abuts against each set of stop bars 903 during the movement. During the abutting process, through the abutting transmission action between the stop bars 903 and the inclined surface 904, the baffle 902 is forced to retract towards the mounting base 901. This retraction movement facilitates the baffle 902 passing over the stop bars 903. After the mounting cylinder 401 rotates, the abutting action between the back of the baffle 902 and the corresponding stop bars 903 blocks the rotated baffle 902 and the mounting cylinder 401, preventing the rotated mounting cylinder 401 from resetting under the action of force. By restricting the resetting of the mounting cylinder 401, the support rod 402 on the mounting cylinder 401 can remain effectively abutted against the inner side of the resistance wire 301, ensuring the stable use of the support component.

[0030] It should be noted that, in this document, relational terms such as "first" and "second" are used only to distinguish one entity or operation from another, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Furthermore, the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such process, method, article, or apparatus.

[0031] Although embodiments of the invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. An electric heating device for a pit-type nitriding furnace, comprising: A treatment box (201) for heating treatment of a pit-type nitriding furnace is provided. The treatment box (201) has multiple sets of heat dissipation holes (202) for heat dissipation during the heating treatment process. The pit-type nitriding furnace includes a furnace body (101). The treatment box (201) is installed on the outside of the furnace body (101). A heating chamber (102) for heating treatment is provided on the inside of the furnace body (101). Its characteristic is that it further includes: An electric heating assembly is disposed between the heating chamber (102) and the processing box (201) for electric heating treatment inside the heating chamber (102); A support assembly is disposed between the heating chamber (102) and the processing box (201) to support the electric heating assembly during use; In addition, a control component for controlling the support force during the support process and an identification component for identifying the support status are provided on the support component; The support assembly includes a mounting cylinder (401), on which a plurality of support rods (402) are fixed for abutting against the inside of the resistance wire (301). The control component includes a drive rod (501), and multiple sets of fixing blocks (502) are fixed inside the mounting cylinder (401). A fixing ring (503) is fixed on the fixing block (502). A slider (504) is fixed on the outside of the drive rod (501). A sliding hole (505) is provided on the slider (504), and the slider (504) is slidably connected to the fixing ring (503) under the action of the sliding hole (505). A first spring (506) is sleeved on the outside of the fixing ring (503).

2. The electric heating device for a pit-type nitriding furnace according to claim 1, characterized in that: Multiple sets of electric heating components are provided on the heating chamber (102) and the processing box (201), and the multiple sets of electric heating components are arranged vertically.

3. The electric heating device for a pit-type nitriding furnace according to claim 2, characterized in that: The electric heating assembly includes a resistance wire (301) disposed inside the heating chamber (102). The two ends of the resistance wire (301) pass through the furnace body (101) to the interior of the processing box (201) and are fixed with conductive connectors (302).

4. The electric heating device for a pit-type nitriding furnace according to claim 1, characterized in that: The identification component includes a pointer (601) fixed to the drive rod (501), and a dial (602) fixed to the outside of the mounting cylinder (401) for identifying the relative rotation amplitude between the mounting cylinder (401) and the drive rod (501).

5. The electric heating device for a pit-type nitriding furnace according to claim 4, characterized in that: The processing box (201) is provided with a drive assembly for driving the drive rod (501) on its outer side. The drive assembly includes a worm gear (701) fixed to one end of the drive rod (501). A worm (702) is provided on the outer side of the processing box (201). The worm gear (701) and the worm (702) are meshed with each other. A rotation assembly for rotating the worm (702) is installed on the outer side of the processing box (201).

6. The electric heating device for a pit-type nitriding furnace according to claim 5, characterized in that: The rotating assembly includes a mounting bracket (801) fixed to the outside of the processing box (201), a rotating shaft (802) rotatably connected to the mounting bracket (801), a worm gear (702) fixed in the center on the rotating shaft (802), and a drive pin (803) fixed at one end of the rotating shaft (802).

7. The electric heating device for a pit-type nitriding furnace according to claim 6, characterized in that: The outer side of the processing box (201) is provided with a blocking assembly for limiting the rotation of the mounting cylinder (401) after rotation. The blocking assembly includes a mounting base (901) fixed to the outer side of the mounting cylinder (401). A baffle (902) is connected to the mounting base (901) through a telescopic assembly. Multiple sets of stop bars (903) for blocking against the baffle (902) are arranged in a circular array on the outer side of the mounting cylinder (401). One end of the stop bar (903) is fixed to the processing box (201). A transmission inclined surface (904) for blocking against the stop bar (903) is opened on one side of the baffle (902).

8. The electric heating device for a pit-type nitriding furnace according to claim 7, characterized in that: The telescopic assembly includes multiple sets of sleeves (1001) fixed on the mounting base (901). A slide rod (1002) is slidably connected to the sleeve (1001). One end of the slide rod (1002) is fixed to the baffle (902). A second spring (1003) is sleeved on the outside of the sleeve (1001). The two ends of the second spring (1003) are respectively connected to the mounting base (901) and the baffle (902).

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