Pit gas carburizing furnace

Abstract

The utility model relates to carburizing furnace technical field especially relates to a well type gas carburizing furnace, include: a well type gas carburizing furnace, include: furnace body, protection subassembly, protection subassembly installs in the feed / discharge end of furnace body, protection subassembly adopts multiple sets design, and multiple protection subassembly is arranged in the inner wall of furnace body in the even distribution mode, support subassembly, support subassembly sets up in the inside bottom end of furnace body, protection subassembly includes: movable slot, movable block and first spring, the utility model in the use process, rubber cover absorbs impact energy by the elastic deformation of itself, significantly reduces the mechanical stress that furnace feed / discharge port bears, the stress block of hemispherical is collided, will produce centripetal force because of stress, makes it to movable slot inside movement, simultaneously, movable block and first spring cooperate and work, convert the kinetic energy of workpiece into elastic potential energy, further weaken the collision force.

Description

Technical Field

[0001] This utility model belongs to the field of carburizing furnace technology, and in particular relates to a pit-type gas carburizing furnace. Background Technology

[0002] A pit-type gas carburizing furnace is an industrial heat treatment device used for surface strengthening of metals, primarily for the carburizing process of steel materials. Its pit-type structure design allows the workpiece to be placed inside the furnace, ensuring that the carburizing gas can uniformly surround the workpiece. The furnace body is equipped with an electric or gas heating system, and the temperature is typically controlled between 850°C and 950°C to promote the penetration of carbon atoms into the metal surface, forming a high-hardness carbide layer while maintaining the toughness of the core.

[0003] In existing pit-type gas carburizing furnace technology, the loading and unloading of workpieces is mainly carried out by suspension. Specifically, the workpiece is suspended from the lifting equipment by a lifting device or hook and then slowly hoisted into the furnace body. The placement position of the workpiece inside the furnace is usually a pre-set support platform. This support platform is designed to stably support the workpiece, ensuring that it remains in a fixed position during heating and carburizing, and avoiding process deviations or equipment damage caused by shaking or displacement.

[0004] However, existing well-type gas carburizing furnaces still have some shortcomings in practical applications. First, during the process of suspending the workpiece in and out of the furnace, the lack of an effective buffering and protection mechanism between the workpiece and the furnace's inlet / outlet makes it prone to collisions with the edges of the inlet / outlet. These collisions can not only cause surface damage or deformation of the workpiece but also create mechanical stress on the furnace's inlet / outlet, affecting its sealing performance and reducing the stability and uniformity of the furnace atmosphere, ultimately impacting the quality of the carburizing process. Second, when the workpiece is placed on the support platform, its bottom is usually covered by the support structure, making it difficult for this area to come into contact with the carburizing gas during the carburizing process, easily forming carburizing dead zones. These dead zones result in uneven carburizing at the bottom of the workpiece, affecting the overall carburizing effect and performance consistency. For workpieces requiring high-precision and high-uniformity carburizing, this is a problem that urgently needs to be solved. Utility Model Content

[0005] The purpose of this invention is to provide a well-type gas carburizing furnace to solve the problems mentioned in the background art.

[0006] The technical solution adopted in this utility model is: a pit-type gas carburizing furnace, comprising:

[0007] The furnace body is provided with a furnace cover at the top and a furnace bottom at the bottom.

[0008] The protective component is installed at the feed / discharge end of the furnace body. The protective component prevents the workpiece from directly colliding with the feed / discharge port of the furnace body when entering or leaving the furnace body. The protective component adopts a multi-set design, and the multiple sets of the protective components are evenly distributed and arranged circumferentially on the inner wall of the furnace body.

[0009] A support assembly is located at the bottom of the furnace body. The support assembly is designed in multiple groups, and the multiple groups of support assemblies work together to provide multi-point support for the workpiece placed on them.

[0010] A gas guiding assembly is installed on the furnace cover and the furnace bottom respectively, and is connected to the furnace body;

[0011] The inner wall surface of the furnace body is fitted with an electric heating alloy wire.

[0012] Optionally, the protection component includes:

[0013] A movable groove is formed on the inner wall of the furnace body;

[0014] A movable block, wherein the movable block is located within a movable slot;

[0015] A first spring is connected between the movable slot and the movable block;

[0016] The force-bearing block is installed at the end of the movable block away from the first spring, and the geometry of the force-bearing block is designed to be hemispherical.

[0017] A rubber sleeve, which is installed on the outside of the stress-bearing block in a wrapping manner;

[0018] A fixing plate is installed on the outer wall of the movable block near the end of the first spring;

[0019] A stop block is installed on the inner wall of the movable groove at the end away from the first spring.

[0020] Optionally, the support component includes:

[0021] A support plate is located at the bottom of the interior of the furnace body, and an elastic component is provided inside the support plate;

[0022] The first telescopic rod has its two ends connected between the support plate and the furnace bottom, respectively.

[0023] Optionally, the resilient component includes:

[0024] The mounting groove is formed on the upper end face of the support plate;

[0025] Mounting plate, wherein the mounting plate is disposed on one side of the mounting groove, and a portion of the mounting plate is located within the mounting groove;

[0026] The second spring is connected between the mounting slot and the mounting plate;

[0027] A limiting groove is formed on the inner wall of the mounting groove along the extension and retraction direction of the second spring;

[0028] A limiting block, wherein the limiting block is fixed to the outer wall of the mounting plate, and a portion of the limiting block is located within a limiting groove;

[0029] An anti-detachment block is fixed to the inner wall of the end of the limiting groove away from the second spring.

[0030] Optionally, the air guiding assembly includes:

[0031] Gas guide tubes are installed on one side of the furnace cover and the furnace bottom, respectively;

[0032] A gas guide pipe, which connects the gas guide cylinder and the furnace body;

[0033] An air intake pipe is connected to one side of the air guide tube;

[0034] An air outlet pipe is connected to one side of the air guide cylinder, and both the air inlet pipe and the air outlet pipe are equipped with valves.

[0035] Optionally, an adjustment assembly is provided between the furnace body and the furnace cover, the adjustment assembly comprising:

[0036] A servo motor, which is mounted on the side wall of the furnace body;

[0037] A rotating shaft connected to the output end of a servo motor;

[0038] A connecting plate, which is fixed to the end of the rotating shaft away from the servo motor;

[0039] The second telescopic rod has its two ends connected to the connecting plate and the furnace cover, respectively.

[0040] Optionally, the heating alloy wire is installed in a spiral shape on the inner wall surface of the furnace body, and the heating alloy wire is led out to the outside of the furnace body through a lead-out rod.

[0041] Optionally, the innermost side of the furnace body is provided with a furnace lining, the outer side of the furnace lining is fitted with a first insulation sleeve, and the outer side of the first insulation sleeve is fitted with a second insulation sleeve.

[0042] Compared with the prior art, the beneficial effects of this utility model are:

[0043] (1) This utility model achieves multiple protections for the furnace body's feed / discharge port by setting up components such as a rubber sleeve, a force-bearing block, and a first spring. During use, the rubber sleeve absorbs impact energy through its own elastic deformation, significantly reducing the mechanical stress borne by the furnace body's feed / discharge port; when the hemispherical force-bearing block is impacted, it generates centripetal force, causing it to move towards the inside of the movable groove; at the same time, the movable block and the first spring work together to convert the kinetic energy of the workpiece into elastic potential energy, further weakening the impact force. This multi-protection mechanism effectively improves the safety of the equipment, reduces the risk of equipment failure due to collisions, and reduces maintenance costs.

[0044] (2) This utility model effectively avoids carburizing dead zones by setting up support plates and a first telescopic rod. During use, the support assembly is designed with multiple support plates, which work in an alternating start-up mode. When the first telescopic rod extends and retracts alternately, it will drive the support plates to move the workpiece intermittently. This design allows each area at the bottom of the workpiece to be fully exposed to the carburizing atmosphere in sequence, thereby eliminating the carburizing dead zone problem that is easily generated by traditional fixed support methods. Through this all-round carburizing operation, not only is the surface of the workpiece guaranteed, but also the carburizing uniformity at the bottom of the workpiece is guaranteed, significantly improving the overall carburizing quality of the workpiece. Attached Figure Description

[0045] To more clearly illustrate the technical solutions in the embodiments of this application or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this application. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0046] Figure 1 This is a structural appearance drawing of this application;

[0047] Figure 2 This is a schematic diagram of the furnace body in this application;

[0048] Figure 3 This is a schematic diagram of the structure of the electrothermal alloy wire in this application;

[0049] Figure 4 This is a schematic diagram of the structure of the rubber sleeve in this application;

[0050] Figure 5 This is a schematic diagram of the supporting components in this application;

[0051] Figure 6 This is a schematic diagram of the support plate in this application;

[0052] Figure 7 This is a schematic diagram of the gas guiding assembly in this application;

[0053] Figure 8 This is a schematic diagram of the structure of the protective component in this application;

[0054] Figure 9 This is a schematic diagram of the structure of the elastic component in this application.

[0055] Figure label:

[0056] 1. Furnace body; 101. Furnace lining; 102. First insulation sleeve; 103. Second insulation sleeve;

[0057] 2. Furnace lid;

[0058] 3. Furnace bottom;

[0059] 4. Protective components; 401. Movable groove; 402. Movable block; 403. First spring; 404. Force-bearing block; 405. Rubber sleeve; 406. Fixing plate; 407. Stop block;

[0060] 5. Support components; 501. Support plate; 502. First telescopic rod;

[0061] 6. Elastic component; 601. Mounting groove; 602. Mounting plate; 603. Second spring; 604. Limiting groove; 605. Limiting block; 606. Anti-detachment block;

[0062] 7. Air guiding assembly; 701. Air guiding cylinder; 702. Air guiding pipe; 703. Air inlet pipe; 704. Air outlet pipe;

[0063] 8. Positioning assembly; 801. Servo motor; 802. Rotary shaft; 803. Connecting plate; 804. Second telescopic rod;

[0064] 9. Heating alloy wire. Detailed Implementation

[0065] In the description of this utility model, it should be understood that the terms "center," "longitudinal," "transverse," "length," "width," "thickness," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," "clockwise," "counterclockwise," "axial," "radial," and "circumferential" indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, or the orientation or positional relationship commonly used when the product of this utility model is in use, or the orientation or positional relationship commonly understood by those skilled in the art. They are only used to facilitate the description of this utility model and to simplify the description, and are not intended to indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this utility model.

[0066] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of this utility model, "a plurality of" means two or more, unless otherwise explicitly specified.

[0067] Given that in existing technologies, when workpieces are suspended and moved into or out of the furnace, the lack of buffering and protection makes them prone to collisions with the furnace's feed / discharge ports, resulting in surface damage or deformation of the workpieces. This also affects the sealing of the furnace opening, reduces the stability and uniformity of the atmosphere inside the furnace, and ultimately affects the carburizing quality. When workpieces are placed on the support platform, their bottoms are often covered by the support structure, forming carburizing dead zones, leading to uneven carburizing and affecting the overall carburizing effect and performance consistency of the workpieces. This poses a particular challenge for workpieces requiring high-precision and high-uniformity carburizing.

[0068] Please see Figures 1-9 As shown, this utility model embodiment provides a pit-type gas carburizing furnace, comprising:

[0069] Furnace body 1, with furnace cover 2 and furnace bottom 3 respectively installed at the top and bottom of furnace body 1;

[0070] The protection component 4 is installed at the feed / discharge end of the furnace body 1. The protection component 4 prevents the workpiece from directly colliding with the feed / discharge port of the furnace body 1 when it enters or exits the furnace body 1. The protection component 4 adopts a multi-set design, and the multiple sets of protection components 4 are evenly distributed and arranged circumferentially on the inner wall of the furnace body 1.

[0071] Support component 5 is located at the bottom of the interior of furnace body 1. The support component 5 adopts a multi-group design, and the multiple support components 5 work together to provide multi-point support for the workpiece placed on them.

[0072] The gas guiding component 7 is installed on the furnace cover 2 and the furnace bottom 3 respectively, and is connected to the furnace body 1;

[0073] The inner wall surface of the furnace body 1 is equipped with an electric heating alloy wire 9.

[0074] Furthermore, protection component 4 includes:

[0075] The movable groove 401 is formed on the inner wall of the furnace body 1;

[0076] Active block 402 is located within active slot 401;

[0077] The first spring 403 is connected between the movable slot 401 and the movable block 402;

[0078] Force-bearing block 404 is installed at the end of movable block 402 away from the first spring 403, and the geometry of force-bearing block 404 is designed to be hemispherical;

[0079] Rubber sleeve 405 is installed on the outside of the force-bearing block 404 in a wrapping manner;

[0080] The fixing plate 406 is installed on the outer wall of the movable block 402 near the first spring 403.

[0081] Stop 407 is installed on the inner wall of the movable groove 401 at the end away from the first spring 403.

[0082] Through the above technical solution:

[0083] In use, under normal operating conditions, the elastic force of the first spring 403 keeps the force-bearing block 404 outside the movable groove 401.

[0084] The workpiece enters and exits the furnace body 1 via a suspension method. Multiple sets of protective components 4 are evenly distributed circumferentially on the inner wall of the furnace body 1. This design ensures effective protection regardless of the direction from which the workpiece enters or leaves the furnace body 1. When the workpiece's sway is too large, it will first collide with the force-bearing block 404. Since the force-bearing block 404 is wrapped with a rubber sleeve 405, the rubber sleeve 405 will undergo elastic deformation at the moment of impact, thereby absorbing part of the impact energy and playing a buffering role. Because the force-bearing block 404 has a hemispherical geometry, it will generate a centripetal force when subjected to the impact force of the workpiece, causing the force-bearing block 404 to move inward towards the movable groove 401. This movement will drive the movable block 402 connected to it to move together, thereby compressing the first spring 403. At this time, the first spring 403 is compressed, converting the kinetic energy of the workpiece into elastic potential energy, thereby reducing the collision force between the workpiece and the equipment. This multi-protection mechanism significantly improves equipment safety and effectively reduces maintenance costs by reducing equipment failures caused by collisions. When the feed / discharge port of furnace body 1 is subjected to impact, the unique structural design ensures its stability and prevents seal failure due to deformation. This design not only protects the feed / discharge port from deformation caused by impact, but also ensures the integrity of its sealing function, thereby ensuring the stability and safety of the carburizing process.

[0085] During the movement of the movable block 402, the movement limit position of the fixed plate 406 connected to it is restricted by the stop block 407. The stop block 407 can prevent the fixed plate 406 from moving out of the movable groove 401, thereby ensuring that the movable block 402 will not fall out of the movable groove 401 and ensuring the structural stability of the entire device.

[0086] After the workpiece is loaded into the basket or hanger and placed in position, the support assembly 5 provides stable support for the workpiece. Subsequently, the furnace cover 2 seals and closes, and the gas guiding assembly 7 introduces a mixture of carburizing gases such as propane and methane with protective gases such as nitrogen into the furnace. Simultaneously, the heating alloy wire 9 is energized and heats up, gradually raising the furnace temperature to the carburizing process temperature, typically 900-950℃. Under this high-temperature environment, the carburizing gas decomposes to produce active carbon atoms, which penetrate the workpiece surface through adsorption and diffusion processes, completing the carburizing process.

[0087] Support component 5 includes:

[0088] Support plate 501 is located at the bottom of the interior of furnace body 1, and elastic component 6 is provided inside support plate 501.

[0089] The first telescopic rod 502 has its two ends connected between the support plate 501 and the furnace bottom 3, respectively.

[0090] Furthermore, the resilient component 6 includes:

[0091] Mounting slot 601 is formed on the upper end face of support plate 501;

[0092] Mounting plate 602 is disposed on one side of mounting groove 601, and a portion of mounting plate 602 is located within mounting groove 601;

[0093] The second spring 603 is connected between the mounting slot 601 and the mounting plate 602;

[0094] The limiting groove 604 is formed on the inner wall of the mounting groove 601 along the extension and retraction direction of the second spring 603.

[0095] Limiting block 605 is fixed to the outer wall of mounting plate 602, and a portion of limiting block 605 is located within limiting groove 604;

[0096] Anti-detachment block 606 is fixed to the inner wall of the end of the limiting groove 604 away from the second spring 603.

[0097] Through the above technical solution:

[0098] When supporting the workpiece, the support assembly 5 contains multiple support plates 501, which are alternately activated by a first telescopic rod 502. During operation, the first telescopic rod 502 drives the support plates 501 to rise and fall alternately. When some support plates 501 move downward, the corresponding area at the bottom of the workpiece is exposed, allowing the carburizing gas to fully contact the workpiece. This alternating movement design ensures that there are no dead spots in the bottom of the workpiece, achieving all-round carburizing, and also ensures the workpiece remains stable during the alternating support process, preventing it from tipping over, thanks to its multi-point support characteristics. This structural design allows all parts of the workpiece to receive the carburizing gas evenly during the carburizing process, significantly improving the uniformity and consistency of carburizing and effectively avoiding rework due to localized lack of carburizing. This not only greatly improves carburizing efficiency, shortens the overall process time, and increases production line capacity, but also makes the carburizing depth and hardness distribution of the workpiece more uniform, enhancing product quality and reliability.

[0099] An elastic component 6 is provided inside the support plate 501, and a mounting plate 602 is located inside the support plate 501. During the upward movement of the support plate 501 and when the workpiece is placed, the mounting plate 602 will first contact the workpiece. Since the mounting plate 602 is connected to the second spring 603, the reaction force of the workpiece will press the mounting plate 602, thereby squeezing the second spring 603. The second spring 603 will thus extend and retract, effectively reducing the instantaneous collision force between the workpiece and the support component 5. This design not only protects the equipment but also prevents potential damage to the workpiece due to collision.

[0100] When the mounting plate 602 moves within the mounting groove 601, it causes the limiting block 605 to move within the limiting groove 604. This design ensures that the mounting plate 602 moves only along the extension and retraction direction of the second spring 603, thereby reducing swaying. Simultaneously, the anti-detachment block 606 blocks the limiting block 605, limiting its extreme movement position and preventing the limiting block 605 from falling out of the limiting groove 604, thus ensuring the structural stability of the entire device.

[0101] To ensure the performance of the first spring 403 and the second spring 603 within the furnace body 1, the spring surfaces are treated with metal plating. Taking nickel plating as an example, the nickel layer effectively blocks the penetration of carbon atoms because nickel has a weak bonding ability with carbon, and the nickel layer possesses good chemical stability. Furthermore, chromium plating improves the surface hardness and corrosion resistance of the springs; the dense chromium layer prevents the carburizing atmosphere from contacting the spring substrate. The alumina film formed after aluminum plating has excellent high-temperature resistance and oxidation resistance, while also hindering carburizing to a certain extent. These surface treatment measures ensure the long-term stability and reliability of the springs under high-temperature, carburizing environments.

[0102] The first telescopic pole 502 needs to meet requirements such as high temperature resistance, oxidation resistance, and carburization resistance. For example, the GH4169 model telescopic pole was selected for its excellent high temperature resistance and mechanical properties, ensuring long-term stable operation in high temperature and carburizing environments.

[0103] The air guiding assembly 7 includes:

[0104] The gas guide tube 701 is installed on one side of the furnace cover 2 and the furnace bottom 3 respectively;

[0105] The gas guide pipe 702 is connected between the gas guide cylinder 701 and the furnace body 1;

[0106] The air intake pipe 703 is connected to one side of the air guide tube 701;

[0107] The air outlet pipe 704 is connected to one side of the air guide tube 701, and both the air inlet pipe 703 and the air outlet pipe 704 are equipped with valves.

[0108] Through the above technical solution:

[0109] During operation, the gas guiding components 7 on the furnace cover 2 and furnace bottom 3 work in an alternating cycle during the introduction of carburizing gas into the furnace body 1. Specifically, when the inlet pipe 703 on the furnace cover 2 is working, the outlet pipe 704 on the furnace bottom 3 is opened, allowing airflow to circulate from top to bottom within the furnace. After a set period of time, the outlet pipe 704 on the furnace cover 2 starts working, and simultaneously the inlet pipe 703 on the furnace bottom 3 is opened, allowing airflow to circulate from bottom to top within the furnace. Through this alternating cycle, the airflow circulates within the furnace, ensuring that the carburizing gas is evenly distributed in every corner of the furnace, thereby avoiding carburizing dead zones caused by uneven airflow.

[0110] An adjustment assembly 8 is provided between the furnace body 1 and the furnace cover 2. The adjustment assembly 8 includes:

[0111] Servo motor 801 is installed on the side wall of furnace body 1;

[0112] The rotating shaft 802 is connected to the output end of the servo motor 801;

[0113] Connecting plate 803 is fixed to the end of rotating shaft 802 away from servo motor 801;

[0114] The second telescopic rod 804 has its two ends connected to the connecting plate 803 and the furnace cover 2, respectively.

[0115] Through the above technical solution:

[0116] In operation, after the workpiece is placed, the servo motor 801 is started. The servo motor 801 drives the connecting plate 803, the second telescopic rod 804, and the furnace cover 2 to rotate together via the rotating shaft 802. During rotation, the furnace cover 2 moves to face directly above the furnace body 1. At this time, the second telescopic rod 804 begins to work, extending and retracting to ensure a tight seal between the furnace cover 2 and the furnace body 1. When the furnace cover 2 needs to be removed, the operation steps are reversed. To control the servo motor 801 and the second telescopic rod 804, the servo driver is correctly connected to the servo motor 801, including a stable power connection and a reliable signal connection. It is also ensured that the driver's power specifications are fully matched to the motor, enabling the motor to accurately respond to control signals. Secondly, an encoder or displacement sensor is installed on the second telescopic rod 804 and connected to the controller. The sensor provides real-time feedback of the telescopic rod's position information, achieving closed-loop control to ensure the telescopic rod reaches the designated position. Furthermore, the closed state of the second telescopic rod 804 can be set as its limit position to regulate the operating range and improve control stability and safety.

[0117] Furthermore, the heating alloy wire 9 is installed in a spiral shape on the inner wall surface of the furnace body 1, and the heating alloy wire 9 is led out to the outside of the furnace body 1 through the lead-out rod.

[0118] Specifically, the heating alloy wire 9, as a resistance heating element, converts electrical energy into heat energy through its internal resistance according to Joule's law when current flows through it, providing the heat required for carburizing in the furnace. The spiral arrangement increases the heating area, effectively improving heating uniformity within the furnace and ensuring consistent temperature distribution. The lead-out rod, as the connection between the heating alloy wire 9 and the external power source, plays a crucial role in conducting current, ensuring the smooth delivery of electrical energy to the heating alloy wire 9. To reduce transmission losses, the lead-out rod is typically made of highly conductive materials such as copper or copper alloys, thereby improving energy transmission efficiency and ensuring stable operation of the carburizing furnace.

[0119] Furthermore, the innermost side of the furnace body 1 is provided with a furnace lining 101, the outer side of the furnace lining 101 is fitted with a first insulation sleeve 102, and the outer side of the first insulation sleeve 102 is fitted with a second insulation sleeve 103.

[0120] Specifically, the innermost part of the furnace body 1 is provided with a furnace lining 101, the main function of which is to protect the structure of the furnace body 1 and provide heat insulation. Since the furnace lining 101 is in direct contact with the high-temperature environment inside the furnace, it is usually made of high-temperature resistant materials such as refractory bricks and ceramic fibers to ensure good thermal and chemical stability under high-temperature conditions.

[0121] A first insulation sleeve 102 is fitted on the outside of the furnace lining 101. Its function is to further enhance the heat insulation performance, reduce the heat loss from the furnace to the outside, and improve the thermal efficiency of the furnace body 1. The first insulation sleeve 102 is generally made of lightweight insulation materials such as aluminum silicate fiber and rock wool to achieve good insulation effect.

[0122] A second insulation sleeve 103 is fitted over the outer side of the first insulation sleeve 102, and together with the furnace lining 101, they form a multi-layer insulation structure. The second insulation sleeve 103 further reduces heat loss while significantly improving the overall insulation performance of the furnace body 1. Its material selection and structural design consider both mechanical strength and durability, ensuring stable and reliable insulation performance during long-term use. The second insulation sleeve 103 can be made of materials such as rock wool board, glass wool felt, aerogel felt, or composite silicate board.

[0123] Finally, it should be noted that the above description is merely a preferred embodiment of this utility model and is not intended to limit the utility model. Although the utility model has been described in detail with reference to the foregoing embodiments, those skilled in the art can still modify the technical solutions described in the foregoing embodiments or make equivalent substitutions for some of the technical features. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of this utility model should be included within the protection scope of this utility model.

Claims

1. A pit gas carburizing furnace characterized by comprising: include: The furnace body is provided with a furnace cover at the top and a furnace bottom at the bottom. The protective component is installed at the feed / discharge end of the furnace body. The protective component prevents the workpiece from directly colliding with the feed / discharge port of the furnace body when entering or leaving the furnace body. The protective component adopts a multi-set design, and the multiple sets of the protective components are evenly distributed and arranged circumferentially on the inner wall of the furnace body. A support assembly is located at the bottom of the furnace body. The support assembly is designed in multiple groups, and the multiple groups of support assemblies work together to provide multi-point support for the workpiece placed on them. A gas guiding assembly is installed on the furnace cover and the furnace bottom respectively, and is connected to the furnace body; The inner wall surface of the furnace body is fitted with an electric heating alloy wire.

2. A pit gas carburizing furnace according to claim 1, characterized in that The protection component includes: A movable groove is formed on the inner wall of the furnace body; A movable block, wherein the movable block is located within a movable slot; A first spring is connected between the movable slot and the movable block; The force-bearing block is installed at the end of the movable block away from the first spring, and the geometry of the force-bearing block is designed to be hemispherical. A rubber sleeve, which is installed on the outside of the stress-bearing block in a wrapping manner; A fixing plate is installed on the outer wall of the movable block near the end of the first spring; A stop block is installed on the inner wall of the movable groove at the end away from the first spring.

3. A pit gas carburizing furnace as defined in claim 1, wherein The support components include: A support plate is located at the bottom of the interior of the furnace body, and an elastic component is provided inside the support plate; The first telescopic rod has its two ends connected between the support plate and the furnace bottom, respectively.

4. A pit gas carburizing furnace as defined in claim 3, wherein The elastic component includes: The mounting groove is formed on the upper end face of the support plate; Mounting plate, wherein the mounting plate is disposed on one side of the mounting groove, and a portion of the mounting plate is located within the mounting groove; The second spring is connected between the mounting slot and the mounting plate; A limiting groove is formed on the inner wall of the mounting groove along the extension and retraction direction of the second spring; A limiting block, wherein the limiting block is fixed to the outer wall of the mounting plate, and a portion of the limiting block is located within a limiting groove; An anti-detachment block is fixed to the inner wall of the end of the limiting groove away from the second spring.

5. A pit gas carburizing furnace as defined in claim 1, wherein The air guiding assembly includes: Gas guide tubes are installed on one side of the furnace cover and the furnace bottom, respectively; A gas guide pipe, which connects the gas guide cylinder and the furnace body; An air intake pipe is connected to one side of the air guide tube; An air outlet pipe is connected to one side of the air guide cylinder, and both the air inlet pipe and the air outlet pipe are equipped with valves.

6. A pit gas carburizing furnace as defined in claim 1, wherein An adjustment assembly is provided between the furnace body and the furnace cover. The adjustment assembly includes: A servo motor, which is mounted on the side wall of the furnace body; A rotating shaft connected to the output end of a servo motor; A connecting plate, which is fixed to the end of the rotating shaft away from the servo motor; The second telescopic rod has its two ends connected to the connecting plate and the furnace cover, respectively.

7. A pit gas carburizing furnace as defined in claim 1, wherein The heating alloy wire is installed in a spiral shape on the inner wall surface of the furnace body, and the heating alloy wire is led out to the outside of the furnace body through the lead-out rod.

8. A pit gas carburizing furnace as defined in claim 1 wherein The innermost side of the furnace body is provided with a furnace lining, the outer side of the furnace lining is fitted with a first insulation sleeve, and the outer side of the first insulation sleeve is fitted with a second insulation sleeve.

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