A temperature-controlled cooling device for rapid spheroidizing annealing of bolt steel

Abstract

This utility model relates to the technical field of temperature control and cooling devices, and in particular to a temperature control and cooling device for rapid spheroidizing annealing of bolt steel. The device includes a furnace body, which is a cylindrical structure. Several electric heating tubes are fixedly installed through the inner wall of the furnace body, arranged in a ring along the inner wall. The terminals of the heating tubes are connected to a common electrical connector, which is a ring structure with a power interface at its outer end. This design achieves uniform heating of the bolt steel through the ring-shaped heating tubes, ensuring heating stability and avoiding localized overheating or uneven heating. Cold air is directly introduced through the cold air inlet for heat exchange, reducing the use of indirect cooling components and improving cooling efficiency. A thermometer monitors the cold air temperature in real time, and a thermocouple thermometer precisely controls the furnace temperature, ensuring the accuracy of the annealing process and thus improving the quality and efficiency of spheroidizing annealing of bolt steel.

Description

Technical Field

[0001] This utility model relates to the technical field of temperature control and cooling devices, and in particular to a temperature control and cooling device for rapid spheroidizing annealing of bolt steel. Background Technology

[0002] Spheroidizing annealing is a heat treatment process primarily used to reduce the hardness of materials, improve their plasticity and toughness, and enhance their machinability. This process is mainly applied to medium carbon steel, high carbon steel, and certain alloy steels.

[0003] The main purpose of spheroidizing annealing is to improve the mechanical properties of materials, making them more suitable for subsequent processing and use. For example, the existing technology, Chinese Patent Publication No. "CN222082862U", provides a spheroidizing annealing rapid cooling device for bolt processing, including: an annealing box, a cooling box provided on one side of the annealing box, two pulleys rotatably connected to the inner walls of the annealing box and the cooling box, and a belt drivingly connected to the surfaces of the two pulleys; a cooling mechanism is provided on the inner wall of the cooling box. In this device, two sets of upper and lower spray pipes and nozzles are used to spray cold air onto the annealed bolts, thereby reducing the cooling time of the bolts. The first impeller is used to achieve uniform spraying of cold air onto the bolts, ensuring the uniformity of bolt cooling, thereby improving the bolt processing effect. The connecting frame, driving rod and driven block are used to realize the back-and-forth swing of multiple spray pipes, thereby improving the uniformity of the nozzles spraying air to cool the bolts, thus improving the bolt cooling effect.

[0004] Currently, bolt steel requires spheroidizing annealing during processing. In this process, the material is heated to a temperature slightly below its critical point and held for a period of time, causing the carbide particles inside the material to transform from plate-like or blocky to spherical. This transformation reduces the material's hardness and improves its plasticity and toughness. Then, the material needs to be cooled slowly, usually in a furnace, to prevent the formation of new hard phases. In most cases, cooling is achieved through water cooling circulation. However, water cooling circulation relies solely on the continuous heat exchange between the high-temperature gas in the furnace and the cold water pipes. This method has low cooling efficiency during continuous processing. Furthermore, the temperature of the circulating water needs to be adjusted during cooling temperature control, resulting in numerous indirect steps and a cumbersome operation. Utility Model Content

[0005] The purpose of this invention is to address the aforementioned shortcomings in the existing technology by proposing a temperature-controlled cooling device for rapid spheroidizing annealing of bolt steel.

[0006] To achieve the above objectives, the present invention adopts the following technical solution:

[0007] Design a temperature-controlled cooling device for rapid spheroidizing annealing of bolt steel, including a furnace body, the furnace body being a cylindrical structure, with several electric heating tubes fixed through the inner wall of the furnace body, the several electric heating tubes being arranged in a ring along the inner wall of the furnace body, the wiring terminals of the several electric heating tubes being connected to the same electrical socket, the electrical socket being a ring structure, and a power interface being provided at the outer end of the electrical socket;

[0008] A material tray seat is fixedly installed at the bottom of the interior of the furnace body, and a material tray assembly is provided at the top of the material tray seat;

[0009] A cold air inlet is fixed through the lower end of one side of the furnace body. A valve is installed on the surface of the cold air inlet. The valve core of the valve is embedded inside the cold air inlet. A transition interface is connected to the outer flange of the valve. A thermometer is installed on the surface of the transition interface. The temperature measuring end of the thermometer is located inside the transition interface.

[0010] In detail, the tray assembly includes a central column, the lower end of which is inserted and connected to the interior of the tray seat, and a positioning column is fixedly installed on the upper end of the central column, with several tray bodies distributed on the surface of the positioning column.

[0011] In detail, an inner sleeve is provided through the center of the material tray body. The inner sleeve and the material tray body are integrally formed. The interior of the inner sleeve slides through the positioning post, and the connection between the two is fixed by screws.

[0012] In detail, a thermocouple thermometer is fixedly installed at the end of the furnace body away from the cold air inlet, and the measuring end of the thermocouple thermometer is connected to the interior of the furnace body.

[0013] In detail, a protective gas interface is also fixed through the lower end of the side wall of the furnace body. A second valve is provided on the surface of the protective gas interface, and the valve core of the second valve is embedded inside the protective gas interface.

[0014] In detail, the furnace body is covered with a furnace cover, and a pressure gauge is fixedly installed through one side of the furnace cover. A valve for exhausting gas is fixedly connected through the gas line of the pressure gauge.

[0015] In detail, several threaded posts are fixedly distributed on the upper part of the furnace body, and mounting sleeves corresponding to the positions of the threaded posts are fixedly through the surface of the furnace cover. The surface of the threaded posts and the interior of the mounting sleeves are slidably connected.

[0016] In detail, the end of the threaded column is threaded with a threaded cap, and the surface of the threaded cap is fixed with knobs. The end face of the threaded cap is fitted to the end of the mounting sleeve.

[0017] The design scheme proposed in this utility model has the following beneficial effects in application:

[0018] 1. This solution achieves uniform heating of bolt steel through a ring-shaped distribution of electric heating tubes, ensuring heating stability and avoiding local overheating or uneven heating. Cold air is directly introduced through the cold air inlet for heat exchange, reducing the use of indirect cooling components and improving cooling efficiency. The thermometer monitors the cold air temperature in real time, and the thermocouple thermometer accurately controls the furnace temperature, ensuring the precision of the annealing process, thereby improving the spheroidizing annealing quality and efficiency of bolt steel.

[0019] 2. As described in 1, the material tray assembly adopts a multi-layer detachable design, which facilitates batch processing of bolt steel. The central column and positioning column structure ensures the stability of the material tray. The protective gas interface allows nitrogen or argon to be introduced to prevent oxidation. The pressure gauge and pressure relief valve monitor the furnace pressure in real time to ensure operational safety. The furnace cover and furnace body are quickly assembled through threaded columns, which has good sealing performance and is easy to maintain. The overall structure is compact and flexible in operation, which is suitable for the needs of industrial production. Attached Figure Description

[0020] Figure 1 This is a schematic diagram of the overall front structure of this utility model;

[0021] Figure 2 This is a schematic diagram of the overall side structure of this utility model;

[0022] Figure 3 This is a schematic diagram of the internal structure of the present invention;

[0023] Figure 4 This is an enlarged schematic diagram of point A of this utility model.

[0024] In the diagram: 1. Furnace body; 11. Heating element; 12. Electrical connector; 13. Power interface; 14. Material tray seat; 15. Material tray assembly; 16. Cold air inlet; 17. Valve 1; 18. Transition interface; 19. Thermometer; 1501. Center column; 1502. Positioning column; 1503. Material tray body; 1504. Internal sleeve; 2. Thermocouple thermometer; 3. Protective gas interface; 31. Valve 2; 4. Furnace cover; 41. Pressure gauge; 42. Valve 3; 4001. Threaded column; 4002. Mounting sleeve; 4003. Threaded cap. Detailed Implementation

[0025] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments of the present utility model. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments.

[0026] Reference Figures 1-4A temperature-controlled cooling device for rapid spheroidizing annealing of bolt steel includes a furnace body 1, which is a cylindrical structure. Several electric heating tubes 11 are fixed through the inner wall of the furnace body 1. The several electric heating tubes 11 are arranged in a ring along the inner wall of the furnace body 1. The terminals of the several electric heating tubes 11 are connected to the same electrical socket 12. The electrical socket 12 is a ring structure. The outer end of the electrical socket 12 is provided with a power interface 13. Through the uniformly distributed electric heating tubes 11, the bolt steel can be uniformly heated at multiple positions during heating, ensuring its heating stability.

[0027] A material tray seat 14 is fixedly installed at the bottom of the furnace body 1. A material tray assembly 15 is provided at the upper end of the material tray seat 14. The material tray assembly 15 can store multiple bolt steels and ensure their stable position during heating or annealing.

[0028] A cold air inlet 16 is fixed through the lower end of one side of the furnace body 1. A valve 17 is installed on the surface of the cold air inlet 16. The valve core of the valve 17 is embedded inside the cold air inlet 16. The outer flange of the valve 17 is connected to a transition interface 18. A thermometer 19 is installed on the surface of the transition interface 18. The temperature measuring end of the thermometer 19 is located inside the transition interface 18. When bolt steel is annealed in the furnace body 1 through the cold air inlet 16, cold air is supplied, so that the cold air can directly exchange heat with the hot air in the furnace body 1, reducing the use of indirect cooling components. In addition, the thermometer 19 can measure the temperature of the cold air supplied through the cold air inlet 16 in real time, avoiding the occurrence of excessive temperature differences.

[0029] It should be further explained that the tray assembly 15 includes a central column 1501. The lower end of the central column 1501 is inserted and connected to the inside of the tray base 14. A positioning column 1502 is fixedly installed on the upper end of the central column 1501. Several tray bodies 1503 are distributed on the surface of the positioning column 1502. Through the cooperation between the central column 1501 and the tray base 14, the positioning of multiple tray bodies 1503 can be realized.

[0030] It should be further explained that an inner sleeve 1504 is provided through the center of the material tray body 1503. The inner sleeve 1504 and the material tray body 1503 are integrally formed. The interior of the inner sleeve 1504 is slidably connected to the positioning post 1502, and the connection between the two is fixed by screws. The multi-layered material tray body 1503 can store multiple bolts.

[0031] It should be further noted that a thermocouple thermometer 2 is fixedly installed at the end of the furnace body 1 away from the cold air inlet 16. The measuring end of the thermocouple thermometer 2 is connected to the interior of the furnace body 1. The thermocouple thermometer 2 can measure the temperature inside the furnace body 1 and facilitate the control of the temperature of the external cold air delivery equipment during annealing and cooling. The cold air inlet 16 is connected to the external cold air delivery equipment via the transition interface 18. The cold air pipe and the cold air delivery equipment are existing equipment and have not been described in detail.

[0032] It should be further noted that a protective gas interface 3 is also fixed through the lower end of the side wall of the furnace body 1. A valve 2 31 is provided on the surface of the protective gas interface 3. The valve core of the valve 2 31 is embedded inside the protective gas interface 3. Nitrogen or argon can be introduced into the protective gas interface 3 to protect the surface when the bolt steel is heated and annealed.

[0033] It should be further explained that the furnace body 1 is covered with a furnace cover 4, and a pressure gauge 41 is fixedly installed through one side of the furnace cover 4. A valve 3 42 for exhaust is fixedly connected through the gas line of the pressure gauge 41. The pressure gauge 41 can measure the pressure inside the furnace body 1 in real time, and when the pressure is too high, it can release pressure and exhaust gas through the valve 3 42, or allow air circulation inside the furnace body 1 when cold air is being supplied.

[0034] It should be further explained that several threaded posts 4001 are fixedly distributed on the upper part of the furnace body 1, and mounting sleeves 4002 corresponding to the positions of the threaded posts 4001 are fixedly inserted through the surface of the furnace cover 4. The surface of the threaded posts 4001 and the interior of the mounting sleeves 4002 are slidably inserted through each other. Through the insertion of the threaded posts 4001 and the mounting sleeves 4002 at multiple positions, multi-point positioning of the furnace body 1 and the furnace cover 4 can be achieved.

[0035] It should be further explained that a threaded cap 4003 is threadedly installed at the end of the threaded column 4001. Knobs are fixedly distributed on the surface of the threaded cap 4003. The end face of the threaded cap 4003 is fitted to the end of the mounting sleeve 4002. The assembly and fixation of the furnace body 1 and the furnace cover 4 can be achieved by the threaded connection between the threaded cap 4003 and the threaded column 4001.

[0036] Working method: This scheme uses multiple electric heating tubes 11 distributed in a ring on the inner wall of the furnace to uniformly heat the bolt steel. The electric heating tubes 11 are centrally powered through the junction box 12 to ensure that each heating unit works synchronously and avoid local overheating or uneven heating. Thermocouple temperature measuring instrument 2 monitors the furnace temperature in real time and feeds the data back to the control system to adjust the power of the electric heating tubes and maintain a stable annealing temperature. During the cooling stage, cold air with a controllable temperature is introduced through cold air inlet 16 and directly exchanges with the hot air in the furnace to achieve rapid cooling. Thermometer 19 monitors the cold air inlet temperature to ensure that the temperature difference between the cold air and the furnace meets the process requirements and avoids uneven internal stress or deformation of the bolt steel due to excessive temperature difference. In addition, nitrogen or argon can be introduced through the protective gas interface 3 to prevent oxidation of the steel surface at high temperature and further improve the annealing quality.

[0037] The bolt steel is placed in layers on the material tray assembly 15. Each layer of material tray body 1503 is fixed to the positioning column 1502 by the built-in sleeve 1504, forming a stable three-dimensional stacked structure. This design not only increases the single processing capacity, but also ensures that the steel is in uniform contact with the heat source or cold air during heating and cooling. During cooling, the cold air enters from the lower end of the furnace body inlet 16, passes through the gap between the material trays from bottom to top, and fully contacts the high-temperature steel to achieve efficient heat exchange. The pressure gauge 41 and valve 3 42 on the furnace cover 4 can adjust the gas pressure inside the furnace to avoid excessive pressure when the cold air is injected, which will affect the airflow distribution. By controlling the cold air flow and temperature, combined with the real-time feedback of the thermocouple temperature measuring instrument 2, the system can dynamically adjust the cooling rate to meet the spheroidizing annealing process requirements of different bolt steel materials.

[0038] The above description is only a preferred embodiment of the present utility model, but the protection scope of the present utility model is not limited thereto. Any equivalent substitutions or changes made by those skilled in the art within the technical scope disclosed in the present utility model, based on the technical solution and the inventive concept of the present utility model, should be included within the protection scope of the present utility model.

Claims

1. A temperature controlled cooling device for fast spheroidizing annealing of a bolt steel, comprising a furnace body (1), characterized in that: The furnace body (1) is a cylindrical structure. Several electric heating tubes (11) are fixed through the inner wall of the furnace body (1). The several electric heating tubes (11) are arranged in a ring along the inner wall of the furnace body (1). The terminals of the several electric heating tubes (11) are connected to the same electrical socket (12). The electrical socket (12) is a ring structure. The outer end of the electrical socket (12) is provided with a power interface (13). The furnace body (1) is fixedly installed with a material tray seat (14) at the bottom of the interior, and a material tray assembly (15) is provided at the top of the material tray seat (14). A cold air inlet (16) is fixed through the lower end of one side of the furnace body (1). A valve (17) is provided on the surface of the cold air inlet (16). The valve core of the valve (17) is embedded inside the cold air inlet (16). A transition interface (18) is connected to the outer flange of the valve (17). A thermometer (19) is provided on the surface of the transition interface (18). The temperature measuring end of the thermometer (19) is located inside the transition interface (18).

2. A temperature controlled cooling device for fast spheroidizing annealing of a bolt steel according to claim 1, characterized in that: The tray assembly (15) includes a central column (1501), the lower end of which is inserted into the interior of the tray seat (14), and a positioning column (1502) is fixedly installed on the upper end of the central column (1501). Several tray bodies (1503) are distributed on the surface of the positioning column (1502).

3. A temperature controlled cooling device for fast spheroidizing annealing of a bolt steel according to claim 2, characterized in that: An inner sleeve (1504) is provided through the center of the material tray body (1503). The inner sleeve (1504) and the material tray body (1503) are integrally formed. The interior of the inner sleeve (1504) slides through the positioning post (1502), and the connection between the two is fixed by screws.

4. A temperature controlled cooling device for fast spheroidizing annealing of a bolt steel according to claim 3, characterized in that: A thermocouple thermometer (2) is fixedly installed at one end of the furnace body (1) away from the cold air inlet (16), and the measuring end of the thermocouple thermometer (2) is connected to the interior of the furnace body (1).

5. A temperature controlled cooling device for fast spheroidizing annealing of a bolt steel according to claim 4, characterized in that: The lower end of the side wall of the furnace body (1) is also fixed with a protective gas interface (3). A valve two (31) is provided on the surface of the protective gas interface (3). The valve core of the valve two (31) is embedded in the interior of the protective gas interface (3).

6. A temperature controlled cooling device for fast spheroidizing annealing of a bolt steel according to claim 5, characterized in that: The furnace body (1) is covered with a furnace cover (4), and a pressure gauge (41) is fixedly installed through one side of the furnace cover (4). A valve three (42) for exhaust is fixedly connected through the gas line of the pressure gauge (41).

7. A temperature controlled cooling device for fast spheroidizing annealing of a bolt steel according to claim 6, characterized in that: Several threaded posts (4001) are fixedly distributed on the top of the furnace body (1), and an installation sleeve (4002) corresponding to the position of the threaded post (4001) is fixedly through the surface of the furnace cover (4). The surface of the threaded post (4001) and the interior of the installation sleeve (4002) are slidably connected.

8. The temperature-controlled cooling device for rapid spheroidizing annealing of bolt steel according to claim 7, characterized in that: The threaded post (4001) is threaded with a threaded cap (4003) at its end. Knobs are fixedly distributed on the surface of the threaded cap (4003). The end face of the threaded cap (4003) is fitted to the end of the mounting sleeve (4002).

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