Furnace pressure adjusting device of pit type gas carburizing furnace
Through the well-type gas carburizing furnace pressure adjustment device, the problems of incomplete exhaust emissions and carbon black accumulation are solved, the quality of carburizing and production safety are improved, and the harmless treatment and green production of waste gas are achieved.
Patent Information
- Application Number
- CN202422494497.9
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-10-16
- Publication Date
- 2025-08-01
- Estimated Expiration
- 2034-10-16
AI Technical Summary
During the carburizing process of the existing well gas carburizing furnace, the exhaust gas emission is not thorough, which affects the determination of the carbon potential in the furnace. There is also carbon black accumulated on the inner wall of the exhaust pipe, resulting in unstable carburizing quality and safety hazards.
A well-type gas carburizing furnace pressure regulation device is designed, including a bracket, annular seat, lever and pressure gland. The exhaust pipe port can be quickly closed and adjusted through the lever principle, combined with a heat insulation cover to prevent open flame leakage, use the chimney effect to promote the exhaust gas oxidation reaction, and adjust the pressure through sealing filler and counterweight nut.
Effective emission and oxidation reaction of waste gas are achieved, the quality of carburizing is improved, open flame leakage is avoided, production safety is ensured, and green production is achieved.
Smart Images
Figure CN223176172U_ABST
Abstract
Description
Technical Field
[0001] The utility model relates to the field of gas carburizing heat treatment of steel parts, in particular to a pit-type gas carburizing furnace pressure regulating device for surface strengthening of gear parts. Background Art
[0002] Gears are high-precision components for realizing mechanical power transmission. To improve the surface hardness and wear resistance of gears and keep the core of the gears strong and tough, gas carburizing is the best surface strengthening heat treatment method. Gas carburizing is to place gear workpieces in an active carburizing medium (carburizing agent), and after heating to a certain temperature, a carbon concentration gradient is formed on the surface layer of the workpieces; however, the necessary condition for the internal furnace chamber of the carburizing furnace to have a stable carbon potential is to maintain the furnace pressure within a certain range. Therefore, furnace pressure regulation is crucial for the carburizing speed and quality of gears.
[0003] During the gas carburizing process, when the temperature rises above 750 °C and the carburizing agent starts to be introduced into the furnace chamber, the original gas inside the furnace chamber needs to be discharged. Secondly, there is a situation where the carburizing agent cannot be completely decomposed during the carburizing process, and the waste gas (such as carbon dioxide, carbon monoxide, and hydrogen, etc.) inside the furnace chamber needs to be discharged in time to avoid affecting the measurement of the actual carbon potential in the furnace; in addition, after a long time of heating, the undecomposed carburizing agent will accumulate carbon black at the bottom of the furnace chamber. At this time, under the disturbance of the furnace cover fan, the carbon black will accumulate on the inner wall of the exhaust pipe, further affecting the true carbon potential inside the carburizing furnace chamber, and ultimately affecting the carburizing effect of the product and causing quality accidents. Therefore, on the premise of ensuring the convenient cleaning of the exhaust holes of the pit-type carburizing furnace, being able to freely adjust the furnace pressure of the pit-type gas carburizing furnace is crucial for the carburizing quality of the product. Summary of the Invention
[0004] The purpose of the utility model is to provide a pit-type gas carburizing furnace pressure regulating device aiming at the defects of the prior art. This device is installed on the exhaust pipe of the pit-type gas carburizing furnace, and can easily realize the free and rapid adjustment of the furnace pressure of the pit-type gas carburizing furnace.
[0005] To achieve the above purpose, the utility model can adopt the following technical solutions:
[0006] The pit-type gas carburizing furnace pressure regulating device described in the utility model includes a bracket arranged on the exhaust pipe of the pit-type gas carburizing furnace. A ring seat sleeved on the outer wall of the exhaust pipe is arranged on the bracket. A ring groove closely attached to the outer wall of the exhaust pipe is opened on the upper surface of the ring seat, and a sealing filler is filled in the ring groove; on the outer wall of the ring seat, a lever is hinged through a connecting frame. One end of the lever is a holding end, and the other end is connected with a pressing cover buckled on the ring seat for covering the exhaust pipe. An insulating cover movably inserted on the outer wall of the ring seat is arranged outside the pressing cover, and an avoidance opening through which the lever passes is provided on the insulating cover.
[0007] Specifically, the bracket includes an annular support plate sleeved on the exhaust pipe, and 3 to 5 oblique support rods are evenly distributed along the circumference on the bottom surface of the annular support plate and are fixedly connected to the outer wall of the exhaust pipe with an inward tilt.
[0008] Furthermore, the ring seat is a frustum-shaped structure that is small at the top and large at the bottom, and the heat insulation cover is a cylindrical structure, which is composed of a frustum-shaped closing section, a cylindrical connecting section and a frustum-shaped plug-in section from top to bottom. The frustum-shaped plug-in section should match the ring seat of the frustum-shaped structure and can be easily plugged into the ring seat, thereby easily realizing the plugging in or disassembly of the heat insulation cover.
[0009] Furthermore, a lower boss extending into the exhaust pipe orifice is provided on the bottom surface of the gland. The lower boss is a cone-shaped structure with a larger upper portion and a smaller lower portion, which can be easily pressed into the exhaust pipe orifice, thereby improving the sealing performance of the entire gland to the exhaust pipe.
[0010] Furthermore, the holding end of the lever is a threaded screw that is inclined upward by 25 to 30 degrees. A pair of counterweight nuts are threadedly installed on the threaded screw, and a counterweight ring is sandwiched between the two counterweight nuts. The position of the counterweight ring on the holding end of the lever can be easily adjusted through the counterweight nut, so as to change the pressure of the pressure cover at the other end of the lever on the exhaust pipe orifice, and at the same time, change the force applied to the holding end of the lever by the operator during subsequent pressure relief and pressure regulation operations.
[0011] The utility model has the advantage that it can be quickly installed on the exhaust pipe of the well-type gas carburizing furnace, thereby forming an effective seal on the pipe mouth of the exhaust pipe, so that the exhaust gas in the furnace of the well-type gas carburizing furnace can be effectively burned near the relatively closed exhaust pipe pipe mouth, so that the exhaust gas discharged from the furnace undergoes an oxidation reaction, thereby improving the harmlessness of the exhaust gas emission of the well-type gas carburizing furnace; at the same time, the lever principle can be used to easily complete the pressure relief and pressure regulation work of the well-type gas carburizing furnace. In addition, the upper and lower ends of the heat insulation cover of the cylindrical structure have through holes, which can form a chimney effect. During the normal carburizing process, the heat insulation cover can gather the burning flames emerging from the edge of the pressure cover upward, and then filter the exhaust gas again through the workshop oil fume purification system, thereby realizing green production, and can effectively block the open flames emerging from the exhaust pipe, avoid accidental injury to operators by open flames, realize open flame-free production of the heat treatment carburizing and quenching production line, and eliminate safety hazards in production. BRIEF DESCRIPTION OF THE DRAWINGS
[0012] Figure 1 It is a structural diagram of the present utility model.
[0013] Figure 2 yes Figure 1 Axonometric view of the center heat shield. DETAILED DESCRIPTION
[0014] Next, in conjunction with the accompanying drawings in the embodiments of the present utility model, the technical solutions in the embodiments of the present utility model will be clearly and completely described. Obviously, the described embodiments are only a part of the embodiments of the present utility model, rather than all the embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative work belong to the scope of protection of the present utility model.
[0015] As Figure 1 , 2 shown, the furnace pressure regulating device of the well-type gas carburizing furnace of the present utility model includes a bracket 1 provided on the exhaust pipe 100 of the well-type gas carburizing furnace. The exhaust pipe 100 is vertically arranged, and the bracket 1 is sleeved around the pipe wall of the exhaust pipe 100. Specifically, the bracket 1 includes an annular support plate 1.1 sleeved on the exhaust pipe 100, and 3 to 5 inclined struts 1.2 are evenly distributed along the circumferential direction on the bottom surface of the annular support plate 1.1 and are fixedly connected to the outer wall of the exhaust pipe 100. To improve the stability of the entire bracket 1, the inner ring surface of the annular support plate 1.1 can also be welded to the outer wall of the exhaust pipe 100.
[0016] A ring seat 2 sleeved on the outer wall of the exhaust pipe 100 is provided on the annular support plate 1.1 of the bracket 1. Specifically, the ring seat 2 is a frustum-shaped structure with a smaller upper part and a larger lower part. The upper surface of the ring seat 2 is flush with the pipe orifice of the exhaust pipe 100, or slightly higher than the pipe orifice of the exhaust pipe 100. The ring seat 2 can be welded to the annular support plate 1.1. Of course, for easy and quick installation or disassembly, it is most preferable to place the ring seat 2 on the annular support plate 1.1. In addition, a ring groove 3 closely attached to the outer wall of the exhaust pipe 100 is opened on the upper surface of the ring seat 2, and a sealing filler 4 is filled in the ring groove 3. The sealing filler 4 is a packing that can withstand high-temperature burning and forms an effective seal by closely attaching to the outer wall of the exhaust pipe 100.
[0017] A lever 6 is hinged to the outer wall of the ring seat 2 through a connecting frame 5. Specifically, one end of the lever 6 is a holding end, and the other end is connected to a pressing cover 7 buckled on the ring seat 2. The pressing cover 7 is used to close the exhaust passage of the exhaust pipe 100 and has a certain weight, and can tightly buckle on the pipe orifice of the exhaust pipe 100 by its own weight. In addition, a lower convex platform 8 extending into the pipe orifice of the exhaust pipe 100 is provided on the bottom surface of the pressing cover 7. The lower convex platform 8 is a frustum-shaped structure with a larger upper part and a smaller lower part, and can be easily pressed into the pipe orifice of the exhaust pipe 100 to effectively cover the pipe orifice of the exhaust pipe, improving the sealing performance of the entire pressing cover 7 to the exhaust pipe, enabling the waste gas in the furnace chamber of the well-type gas carburizing furnace to effectively burn at the relatively closed pipe orifice of the exhaust pipe 100, enhancing the oxidation reaction of the furnace chamber waste gas, ensuring the harmlessness of the waste gas emission of the well-type gas carburizing furnace, and at the same time, the lever principle can be used to turn the pressing cover 7 upwards to easily complete the pressure relief and pressure regulation work of the well-type gas carburizing furnace.
[0018] An insulating cover 9 which is movably inserted outside the gland 7 on the outer wall of the ring seat 2 is also provided. The insulating cover 9 has an avoidance opening 10 through which the lever 6 can pass. Specifically, the insulating cover 9 is of a cylindrical structure and is successively composed of a frustum-shaped closing section 9.1, a cylindrical connecting section 9.2, and a frustum-shaped plugging section 9.3 from top to bottom. And the frustum-shaped plugging section 9.3 should match the frustum-shaped ring seat 2 and can be easily plugged onto the ring seat 2, so as to easily realize the plugging or disassembly of the insulating cover 9, effectively blocking the open fire escaping outward from the gap between the exhaust pipe 100 and the gland 7, avoiding the open fire from accidentally injuring the operator, and eliminating the potential safety hazards existing in production. In addition, the insulating cover 9 can also be easily disassembled to open the gland 7, so as to facilitate the subsequent thorough cleaning of the carbon black attached to the inside of the exhaust pipe 100 by using special tools.
[0019] Furthermore, to facilitate the adjustment of the pressure of the gland 7, the holding end of the lever 6 can also be designed as a threaded screw rod 11 inclined upward by 25 to 30°. A pair of counterweight nuts 12 are screwed on the threaded screw rod 11, and at least one set of counterweight rings 13 is clamped between the two counterweight nuts 12 (of course, the number of counterweight rings 13 can be determined according to the actual weight of the gland 7 and the self-weight of the counterweight rings 13). The position of the counterweight rings 13 on the threaded screw rod 11 can be easily adjusted through the counterweight nuts 12, thereby changing the pressure of the gland 7 on the nozzle of the exhaust pipe 100. At the same time, it can also change the magnitude of the force applied to the holding end of the lever 6 by the operator during the subsequent pressure relief and pressure regulation operations.
[0020] It should be noted that all directional indications (such as up, down, left, right, front, back...) in the embodiments of the present invention are only used to explain the relative position relationship and movement conditions between components in a certain specific posture (as shown in the drawings). If this specific posture changes, then the directional indications will also change accordingly.
Claims
1. A well-type gas carburizing furnace furnace pressure regulating device, characterized in that: It includes a bracket arranged on the exhaust pipe of a pit-type gas carburizing furnace. A ring seat sleeving around the outer wall of the exhaust pipe is arranged on the bracket. A ring groove closely attached to the outer wall of the exhaust pipe is formed on the upper surface of the ring seat, and a sealing filler is filled in the ring groove. A lever is hinged to the outer wall of the ring seat through a connecting frame. One end of the lever is a holding end, and the other end is connected with a gland that buckles on the ring seat for covering the exhaust pipe. A heat insulation cover movably inserted on the outer wall of the ring seat is sleeved outside the gland, and an avoidance opening through which the lever passes is formed on the heat insulation cover.
2. The well-type gas carburizing furnace furnace pressure regulating device according to claim 1, characterized in that: The bracket includes an annular support plate sleeved on the exhaust pipe. 3 to 5 inclined struts fixedly connected to the outer wall of the exhaust pipe inwardly are circumferentially and uniformly distributed on the bottom surface of the annular support plate.
3. The well-type gas carburizing furnace furnace pressure regulating device according to claim 1, characterized in that: The ring seat is a frustum-shaped structure with a smaller upper part and a larger lower part. The heat insulation cover is a cylindrical structure, which is successively composed of a frustum-shaped closing section, a cylindrical connecting section, and a frustum-shaped inserting section from top to bottom.
4. The well-type gas carburizing furnace pressure regulating device according to claim 1, characterized in that: A lower convex platform extending into the pipe orifice of the exhaust pipe is arranged on the bottom surface of the gland. The lower convex platform is a frustum-shaped structure with a larger upper part and a smaller lower part.
5. The well-type gas carburizing furnace furnace pressure regulating device according to claim 1, characterized in that: The holding end of the lever is a threaded screw rod inclined upward at 25 to 30°. A pair of counterweight nuts are screwed on the threaded screw rod, and a counterweight ring is clamped between the two counterweight nuts.