Continuous heat treatment device for large-batch metal fasteners

Abstract

The utility model discloses a continuous heat treatment device for mass metal fasteners, which comprises heat treatment frames and a first conveying mechanism, a pre-cooling frame is fixedly connected between two adjacent heat treatment frames, a second conveying mechanism is arranged on the inner bottom side of the pre-cooling frame, two sides of the pre-cooling frame are respectively provided with a feed port, two sides of the pre-cooling frame are respectively provided with a first groove, and a second conveying mechanism is arranged on the first groove. The precooling frame is located on the first groove and fixedly connected with an air guide pipe, a liquid nitrogen bottle is arranged on one side of the air guide pipe, an electric control valve is fixedly connected to one side of an outlet of the liquid nitrogen bottle, a pipe fitting is fixedly connected to one side of the electric control valve, and one end of the pipe fitting is communicated with the air guide pipe. According to the utility model, the pre-cooling frame is arranged between the two heat treatment frames, and the two air guide fans are matched with the air guide pipe and the liquid nitrogen bottle, so that nitrogen circulating airflow can be formed, the metal fastener is pre-cooled, an oxide layer formed by contact of oxygen and the metal fastener is reduced, and the thermal stress and the deformation risk are reduced.

Description

Technical Field

[0001] This utility model relates to the field of heat treatment technology for metal fasteners, and specifically to a continuous heat treatment device for mass production of metal fasteners. Background Technology

[0002] Metal fasteners first need to pass through a heating zone, then undergo austenitization at a precisely controlled temperature, followed by rapid cooling in a quenching tank to form a martensitic structure. After cleaning to remove surface residues, they are finally tempered in a tempering furnace to eliminate quenching stress and adjust mechanical properties. By processing metal fasteners in batches, product quality can be improved.

[0003] According to Chinese Patent Publication No. CN220977087U, entitled "A Continuous Heat Treatment Device for Mass Metal Fasteners," the main process involves pulling a pull plate, which in turn drives a connecting rod. The moving connecting rod then drives a slider, which slides along the inner wall of a guide rail. Simultaneously, the slider moves a support plate, providing temporary support for the workpiece. The moving support plate also activates an anti-slip pad, preventing the workpiece from slipping on the support plate surface. The connecting rod's movement also drives a circular plate, which in turn activates a surface-mounted limiting plate. Pressing the connecting rod until the support plate is adjusted to the designated position is sufficient. Pulling the connecting rod then causes the limiting plate to insert along the surface of a rectangular hole until it engages with the inner wall of the hole. The limiting plate temporarily secures the support plate.

[0004] Common continuous heat treatment equipment for metal fasteners typically includes key modules such as heating, conveying, cooling, and drying during the actual heat treatment process. By adopting automated design, production efficiency and heat treatment quality can be improved. However, during the heat treatment process, metal fasteners are usually subjected to high temperatures, and due to the large temperature difference between the surface and the core, severe thermal stress can be triggered, leading to workpiece deformation and cracks, which affects the quality of the workpiece. Utility Model Content

[0005] To address the shortcomings of existing technologies, this invention provides a continuous heat treatment device for mass production of metal fasteners, thereby reducing workpiece deformation and cracking and improving workpiece quality.

[0006] The technical solution adopted by this utility model to solve the technical problem is: a continuous heat treatment device for mass production of metal fasteners, including a heat treatment frame and a first conveying mechanism. A pre-cooling frame is fixedly connected between two adjacent heat treatment frames. A second conveying mechanism is provided on the bottom side of the pre-cooling frame. Feed inlets are opened on both sides of the pre-cooling frame. A first groove is opened on both sides of the pre-cooling frame. A bracket is fixedly connected in the first groove. A guide fan is rotatably connected to the bracket. A gas guide pipe is fixedly connected to the pre-cooling frame on the first groove. A liquid nitrogen bottle is provided on one side of the gas guide pipe. An electric control valve is fixedly connected to the outlet side of the liquid nitrogen bottle. A pipe is fixedly connected to one side of the electric control valve. One end of the pipe communicates with the gas guide pipe. A nitrogen concentration sensor is fixedly connected to one side of the gas guide pipe. A connecting plate is fixedly connected to one side of the gas guide pipe. An air inlet pipe is evenly fixedly connected between two opposite connecting plates. A water-cooling frame is fixedly connected to the upper end of the pre-cooling frame. The air inlet pipe is located in the water-cooling frame.

[0007] As a preferred technical solution of this utility model, a fixing plate is fixedly connected to both sides of the precooling frame. The fixing plate is located between the first conveying mechanism and the second conveying mechanism. By setting the fixing plate, the translation of the metal fastener can be facilitated.

[0008] As a preferred technical solution of this utility model, a support plate is provided inside the second conveying mechanism. The support plate is fixedly connected inside the precooling frame. By providing the support plate, further support can be provided for the metal fasteners.

[0009] As a preferred technical solution of this utility model, an electric push rod is fixedly connected to the upper end of the precooling frame, and a sealing plate is fixedly connected to the output end of the electric push rod. The sealing plate corresponds to the feed inlet. By setting the electric push rod, the sealing plate can be driven to close the feed inlet, thereby reducing the gap and facilitating the precooling of metal fasteners.

[0010] As a preferred technical solution of this utility model, the precooling frame is fixedly connected to an air guide hood on one side of the first groove, and an inclined plate is fixedly connected inside the air guide hood. The inclined plate is evenly provided with through holes. By setting the air guide hood and the inclined plate, it is easy to guide the airflow to contact the metal fastener.

[0011] This utility model has the following advantages: by setting a pre-cooling frame between two heat treatment frames and using two guide fans in conjunction with the air guide pipe and liquid nitrogen bottle, a nitrogen circulation airflow can be formed to pre-cool the metal fasteners while reducing the oxide layer formed by oxygen contacting the metal fasteners, and reducing the risk of thermal stress and deformation. Attached Figure Description

[0012] Figure 1 This is a side cross-sectional view of a preferred embodiment of the continuous heat treatment device for mass production of metal fasteners according to this utility model.

[0013] Figure 2 This is a side cross-sectional view of the precooling frame of a preferred embodiment of the present invention for a continuous heat treatment device for mass production of metal fasteners.

[0014] Figure 3 This is an enlarged structural diagram of point A of a preferred embodiment of a continuous heat treatment device for mass production of metal fasteners.

[0015] Explanation of reference numerals in the attached drawings: 1. Heat treatment frame; 2. First conveying mechanism; 3. Pre-cooling frame; 4. Second conveying mechanism; 5. Feed inlet; 6. First groove; 7. Guide fan; 8. Gas guide pipe; 9. Liquid nitrogen bottle; 10. Electrically controlled valve; 11. Gas inlet pipe; 12. Water-cooled frame; 13. Nitrogen concentration sensor; 14. Fixing plate; 15. Support plate; 16. Electric push rod; 17. Sealing plate; 18. Gas guide hood; 19. Inclined plate. Detailed Implementation

[0016] The present invention will be further described below with reference to the accompanying drawings.

[0017] Please refer to the following: Figure 1-3The device for continuous heat treatment of large batches of metal fasteners includes a heat treatment frame 1 and a first conveying mechanism 2. A pre-cooling frame 3 is fixedly connected between two adjacent heat treatment frames 1. A second conveying mechanism 4 is provided on the bottom side of the pre-cooling frame 3. Both the first conveying mechanism 2 and the second conveying mechanism 4 are controlled to rotate by servo motors. Plates for supporting metal fasteners can be placed on the conveyor belt, enabling batch conveying of metal fasteners. Feed inlets 5 are provided on both sides of the pre-cooling frame 3. The feed inlets 5 are higher than the height of the metal fasteners, so as not to obstruct the movement of the metal fasteners and the supporting plates. First grooves 6 are provided on both sides of the pre-cooling frame 3. A bracket is fixedly connected to the first groove 6. Two guide fans 7 are rotatably connected to the bracket. The two guide fans 7 are driven by a drive motor and rotate to guide the airflow. Simultaneously, the two guide fans 7 rotate asynchronously. The airflow speed of the guide fan 7 on the side closer to the liquid nitrogen cylinder 9 is higher than that of the other guide fan 7. This pressurizes the precooling frame 3 and precools the metal fasteners while causing nitrogen to escape from the gaps, reducing the chance of air entering the precooling frame 3. A gas guide pipe 8 is fixedly connected to the precooling frame 3 on the first groove 6. A liquid nitrogen cylinder 9 is located on one side of the gas guide pipe 8. An electric control valve 10 is fixedly connected to the outlet side of the liquid nitrogen cylinder 9. The electric control valve 10 consists of a rotating plate and a servo motor. The servo motor drives the rotating plate to rotate, enabling communication between the liquid nitrogen cylinder 9 and the gas guide pipe 8. A fitting is fixedly connected to one side of the electric control valve 10, with one end of the fitting connected to the gas guide pipe 8. A nitrogen concentration sensor 13 is fixedly connected to one side of the gas guide pipe 8. The nitrogen concentration sensor 13 is connected in series with the servo motor on the electric control valve 10 via a wire. The nitrogen concentration sensor 13 is a BAPI model. The ZPS-ACC10 has a connecting plate fixedly connected to one side of the gas duct 8, and an inlet pipe 11 is evenly fixedly connected between the two opposite connecting plates. A water-cooling frame 12 is fixedly connected to the upper end of the pre-cooling frame 3. The inlet pipe 11 is located inside the water-cooling frame 12. When nitrogen carries the heat from the metal fasteners, it passes through the inlet pipe 11 and completes heat exchange with the cooling water.

[0018] The precooling frame 3 is fixedly connected to two sides by a fixing plate 14. The fixing plate 14 is located between the first conveying mechanism 2 and the second conveying mechanism 4. By setting the fixing plate 14, the gap between the first conveying mechanism 2 and the second conveying mechanism 4 can be sealed, which facilitates the movement of the plate that supports the metal fastener.

[0019] The second conveying mechanism 4 is equipped with a support plate 15, which is fixedly connected to the precooling frame 3. By setting the support plate 15, the movement of the plate can be further stabilized.

[0020] Among them, an electric push rod 16 is fixedly connected to the upper end of the precooling frame 3, and a sealing plate 17 is fixedly connected to the output end of the electric push rod 16. The sealing plate 17 corresponds to the feed inlet 5. By setting the electric push rod 16 to drive the sealing plate 17 to seal the feed inlet 5, the gap between the precooling frame 3 and the second conveying mechanism 4 is reduced.

[0021] Among them, the precooling frame 3 is fixedly connected to the gas guide hood 18 on one side of the first groove 6, and the gas guide hood 18 is fixedly connected to the inclined plate 19. The inclined plate 19 is evenly provided with through holes. By setting the gas guide hood 18, the inclined plate 19 and the through holes, the contact between nitrogen and the receiving metal fastener can be increased.

[0022] Working principle: The plate bearing the metal fastener moves from the first conveying mechanism 2 in the heat treatment frame 1 to the pre-cooling frame 3. Then, the electric push rod 16 drives the sealing plate 17 to close the feed port 5. At this time, the drive motor on the electric control valve 10 drives the valve plate to open, allowing nitrogen to enter the gas guide pipe 8. Then, the two guide fans 7 rotate, causing the nitrogen to circulate in the pre-cooling frame 3 and the gas guide pipe 8. Furthermore, the heat on the metal fastener enters the air inlet pipe 11 with the airflow. After water cooling, it returns to the pre-cooling frame 3. This can provide continuous heat treatment for a large number of metal fasteners and provide pre-cooling for the metal fasteners, reducing the risk of thermal stress and deformation.

[0023] The above are merely preferred embodiments of this utility model. It should be noted that those skilled in the art can make various improvements and modifications without departing from the principle of this utility model, and these improvements and modifications should also be considered within the scope of protection of this utility model.

[0024] All other parts of this utility model that are not described in detail belong to the prior art, and therefore will not be described in detail here.

[0025] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of this utility model, and are not intended to limit it. Although the utility model has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some or all of the technical features therein. Such modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of this utility model.

Claims

1. A continuous heat treatment apparatus for mass production of metal fasteners, comprising a heat treatment frame (1) and a first conveying mechanism (2), characterized in that, A precooling frame (3) is fixedly connected between two adjacent heat treatment frames (1). A second conveying mechanism (4) is provided on the bottom side of the precooling frame (3). A feed inlet (5) is provided on both sides of the precooling frame (3). A first groove (6) is provided on both sides of the precooling frame (3). A bracket is fixedly connected in the first groove (6). A guide fan (7) is rotatably connected to the bracket. A gas guide pipe (8) is fixedly connected to the precooling frame (3) on the first groove (6). A liquid nitrogen bottle (9) is provided on one side of the gas guide pipe (8). The liquid nitrogen cylinder (9) is fixedly connected to an electric control valve (10) on one side of the outlet. The electric control valve (10) is fixedly connected to a pipe fitting on one side. One end of the pipe fitting is connected to the gas guide pipe (8). The gas guide pipe (8) is fixedly connected to a nitrogen concentration sensor (13) on one side. The gas guide pipe (8) is fixedly connected to a connecting plate on one side. An inlet pipe (11) is evenly fixedly connected between two opposite connecting plates. A water cooling frame (12) is fixedly connected to the upper end of the precooling frame (3). The inlet pipe (11) is located inside the water cooling frame (12).

2. The continuous heat treatment apparatus for mass production of metal fasteners as described in claim 1, characterized in that, The precooling frame (3) is fixedly connected to two sides by a fixing plate (14), which is located between the first conveying mechanism (2) and the second conveying mechanism (4).

3. The continuous heat treatment apparatus for mass production of metal fasteners as described in claim 2, characterized in that, The second conveying mechanism (4) is provided with a support plate (15), which is fixedly connected to the precooling frame (3).

4. The continuous heat treatment apparatus for mass production of metal fasteners as described in claim 3, characterized in that, An electric push rod (16) is fixedly connected to the upper end of the precooling frame (3), and a sealing plate (17) is fixedly connected to the output end of the electric push rod (16). The sealing plate (17) corresponds to the feed inlet (5).

5. The continuous heat treatment apparatus for mass production of metal fasteners as described in claim 4, characterized in that, The precooling frame (3) is fixedly connected to an air guide hood (18) on one side of the first groove (6). An inclined plate (19) is fixedly connected inside the air guide hood (18), and through holes are evenly opened on the inclined plate (19).

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