Segmented bolt steel material spheroidizing annealing furnace

Abstract

The utility model relates to annealing furnace technical field especially relates to a sectional type bolt steel material spheroidizing annealing furnace, including furnace body, the lower end distribution fixed of furnace body has a plurality of support legs, and the inside of furnace body is provided with a plurality of furnace cavities, and the inner wall both sides of furnace cavity are installed with a plurality of heat insulation seats on the upper end, and the inside insertion fixed of heat insulation seat has electric heating tube, and the inside lower end of furnace cavity is fixed with the same number of heat insulation sleeve as electric heating tube and penetrates. This scheme adopts sectional type electric heating tube design, and the symmetrical electric heating tube of both sides cooperates ceramic heat insulation seat and heat insulation sleeve, ensures the temperature uniformity in furnace cavity, avoids local overheating, reduces the loss of heat to furnace body shell simultaneously. Through the power supply seat connection temperature regulating switch, can flexibly adjust each electric heating tube temperature, satisfies the annealing process demand of different steel, built-in thermocouple thermometer real time monitoring furnace temperature, combines cold gas pipeline and protective gas interface, realizes heating - heat preservation - cooling whole process accurate control.

Description

Technical Field

[0001] This utility model relates to the field of annealing furnace technology, and in particular to a segmented bolt steel spheroidizing annealing furnace. Background Technology

[0002] A segmented bolt steel spheroidizing annealing furnace is a device used for spheroidizing annealing bolt steel. Spheroidizing annealing is a heat treatment process mainly used to reduce material hardness, improve machinability, eliminate internal stress, refine grains, and prepare for subsequent quenching or other heat treatments.

[0003] The furnace body is divided into multiple heating zones, each with independently controllable temperature. This design facilitates more precise temperature control, meeting the annealing requirements at different stages. For example, Chinese Patent Publication No. CN220413452U provides a temperature-controlled annealing furnace for processing large hexagonal high-strength bolts. This furnace includes a base plate, with a first support and a second support fixedly mounted on its upper surface, the second support positioned above the first support. A conveying assembly is installed in the middle of the first support, conveying hexagonal nuts. A guiding assembly is installed in the middle of the second support, arranging the nuts. A heating coil is mounted on the surface of the base plate, connected to an external high-frequency AC power supply. The heating coil is equipped with a control assembly, which controls its movement and placement onto the hexagonal nut. In this invention, the hexagonal nut is heated by the high-frequency magnetic field generated by the heating coil, inducing eddy currents within the nut. This design is more suitable for processing large hexagonal nuts, solving the problem of low annealing efficiency for large hexagonal nuts in related technologies.

[0004] Currently, the mass production of bolt steel involves processes such as heating and annealing. Conventional heating and annealing processes are carried out using heating and annealing furnaces. However, most heating and annealing furnaces only have a single furnace chamber structure. After heating, it is necessary to wait for the annealing to finish before the next batch of production can begin, which greatly reduces production efficiency. Utility Model Content

[0005] The purpose of this utility model is to address the aforementioned shortcomings in the existing technology by proposing a segmented bolt steel spheroidizing annealing furnace.

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

[0007] Design a segmented bolt steel spheroidizing annealing furnace, including a furnace body, with several legs fixedly distributed at the lower end of the furnace body, and several furnace cavities opened inside the furnace body. Several heat insulation seats are installed on the upper ends of both sides of the inner wall of the furnace cavity, and electric heating tubes are inserted and fixed inside the heat insulation seats. The same number of heat insulation sleeves as the electric heating tubes are fixed through the lower end of the inner wall of the furnace cavity. The surface of the electric heating tubes extends outward through the interior of the heat insulation sleeves. Both the heat insulation seats and the heat insulation sleeves are made of ceramic material.

[0008] Several electric heating tubes arranged side by side along one side of the furnace cavity share the same power socket at their lower ends.

[0009] The furnace cavity is equipped with an object placement assembly, which includes a back plate. The lower end of the back plate is fixed to the bottom of the furnace cavity. Two vertically distributed placement plates are fixed on the side of the object placement assembly facing the opening of the furnace cavity. The upper end of the placement plates is provided with a placement groove.

[0010] In detail, a thermometer is installed through the upper part of the furnace cavity, and the measuring end of the thermometer is located inside the furnace cavity.

[0011] In detail, a valve for exhaust is fixed through the upper part of the furnace cavity, and the valve and the thermometer are arranged side by side.

[0012] In detail, a tube seat is fixedly installed on one side of the upper end of the furnace body by a bracket, and a cold air pipe is inserted into the inside of the tube seat.

[0013] In detail, the lower end of the cold air pipe is fixed with a cold air interface that matches the number of furnace cavities. The cold air interface is connected to the furnace cavity through the furnace body. A valve three is provided on the surface of the cold air interface, and the valve core of the valve three is embedded inside the cold air interface.

[0014] In detail, an air pump is fixed to the side of the furnace body away from the tube seat by a bracket, and the air outlet of the air pump is connected to the flange at the end of the cold air interface away from the tube seat.

[0015] In detail, the air pump has a transition interface at the air inlet flange, and a filter screen is embedded inside the transition interface. The filter screen is made of aluminum alloy wire mesh material.

[0016] In detail, the front of the furnace body is hinged with several door panels, which cover the opening of the furnace cavity. A handle lock is installed on the door panel away from the hinge point.

[0017] In detail, several protective gas ports are fixedly installed through the back of the furnace body. One end of the protective gas port is connected to the inside of the furnace cavity. A second valve is provided on the surface of the protective gas port, and the valve core of the second valve is embedded inside the protective gas port.

[0018] The design scheme proposed in this utility model has the following beneficial effects in application:

[0019] 1. This design employs a segmented heating element design, with symmetrically distributed heating elements on both sides, combined with ceramic insulation bases and insulation sleeves, to ensure uniform temperature within the furnace cavity, prevent localized overheating, and reduce heat loss to the furnace shell. A temperature control switch connected to the power socket allows for flexible adjustment of the temperature of each heating element to meet the annealing process requirements of different steels. An internal thermocouple thermometer monitors the furnace temperature in real time, and combined with cold gas piping and protective gas interfaces, precise control of the entire heating-holding-cooling process is achieved.

[0020] 2. As described in 1, the furnace body adopts a multi-chamber independent structure. Each furnace chamber is equipped with a detachable shelf, an independent cold air interface and a protective gas interface, which supports the simultaneous processing of multiple batches of bolt steel of different specifications. The cold air system achieves efficient and clean cooling through air pumps and filters. The valves can independently adjust the cooling rate of each furnace chamber. The inert gas protection function effectively prevents steel oxidation. Attached Figure Description

[0021] Figure 1 This is a schematic diagram of the overall front structure of this utility model;

[0022] Figure 2 This is a schematic diagram of the overall rear structure of this utility model;

[0023] Figure 3 This is a schematic diagram of the internal structure of the furnace cavity of this utility model;

[0024] Figure 4 This is a schematic diagram of the internal structure of the transition interface of this utility model.

[0025] In the diagram: 1. Furnace body; 10. Support leg; 11. Furnace cavity; 12. Insulation base; 13. Insulation sleeve; 14. Heating element; 15. Power socket; 16. Item placement assembly; 1601. Back panel; 1602. Shelf; 17. Thermometer; 18. Valve 1; 2. Protective gas interface; 21. Valve 2; 3. Pipe seat; 31. Cold air pipe; 32. Cold air interface; 33. Valve 3; 34. Air pump; 35. Transition interface; 36. Filter screen; 4. Door panel; 41. Handle lock. Detailed Implementation

[0026] 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.

[0027] Reference Figures 1-4A segmented spheroidizing annealing furnace for bolt steel includes a furnace body 1. Several support legs 10 are fixedly distributed at the lower end of the furnace body 1. Several furnace cavities 11 are opened inside the furnace body 1. Several heat insulation seats 12 are installed on the upper ends of both sides of the inner wall of the furnace cavity 11. Electric heating tubes 14 are inserted and fixed inside the heat insulation seats 12. The same number of heat insulation sleeves 13 as the electric heating tubes 14 are fixedly inserted through the lower end of the inner wall of the furnace cavity 11. The surface of the electric heating tubes 14 extends outward through the interior of the heat insulation sleeves 13. The heat insulation seats 12 and heat insulation sleeves 13 are both made of ceramic material. The distribution of electric heating tubes 14 on both sides of the furnace cavity 11 can ensure the uniform heating of the bolt steel. The heat insulation seats 12 and heat insulation sleeves 13 can facilitate the heating of the electric heating tubes 14, and the heat should not affect the shell of the furnace body 1 as much as possible.

[0028] Several electric heating tubes 14 arranged side by side along one side of the furnace cavity 11 are all mounted on the same power socket 15 at their lower ends. The power socket 15 can be connected to an external temperature control switch via wires, thereby allowing the temperature of the electric heating tubes 14 to be adjusted.

[0029] An object placement assembly 16 is installed inside the furnace cavity 11. The object placement assembly 16 includes a back plate 1601. The lower end of the back plate 1601 is fixed to the bottom of the furnace cavity 11. Two vertically distributed placement plates 1602 are fixed on the side of the object placement assembly 16 facing the opening of the furnace cavity 11. The upper end of the placement plate 1602 is provided with a placement groove. The placement groove of the placement plate 1602 can be used to place bolt steel for heating and annealing, so as to ensure the stability of its position during the heating and annealing process.

[0030] It should be further noted that a thermometer 17 is installed through the upper part of the furnace cavity 11. The temperature measuring end of the thermometer 17 is located inside the furnace cavity 11. The thermometer 17 is a thermocouple thermometer, which can detect the heating and annealing temperature inside the furnace cavity 11.

[0031] It should be further noted that a valve 18 for exhaust is also fixed through the upper part of the furnace cavity 11. The valve 18 and the thermometer 17 are arranged side by side. The valve 18 is a gas valve structure, which can be used to exhaust the furnace cavity 11 when the pressure inside the furnace cavity 11 is too high or when exhaust is required.

[0032] It should be further noted that a pipe seat 3 is fixedly installed on one side of the upper end of the furnace body 1 by a bracket. A cold air pipe 31 is inserted into the inside of the pipe seat 3. The cold air pipe 31 is set across the furnace body 1 to ensure that the path of cold air delivery can cover the position of each furnace cavity 11.

[0033] It should be further explained that the lower end of the cold air pipe 31 is fixed with a number of cold air interfaces 32 matching the number of furnace cavities 11. The cold air interfaces 32 are connected to the furnace body 1 and the furnace cavity 11. A valve 33 is provided on the surface of the cold air interface 32. The valve core of the valve 33 is embedded inside the cold air interface 32. The cold air interface 32 can supply cold air to the furnace cavity 11. Each cold air interface 32 is equipped with an independent valve 33, which can supply or cut off the cold air supply according to the current annealing status in the furnace cavity 11 and whether annealing is required.

[0034] It should be further noted that an air pump 34 is fixed to the side of the furnace body 1 away from the tube seat 3 by a bracket. The air outlet of the air pump 34 is connected to the flange at the end of the cold air interface 32 away from the tube seat 3. The air pump 34 can provide sufficient airflow during cold air delivery.

[0035] It should be further noted that the air pump 34 has a transition interface 35 connected to the air inlet flange. A filter screen 36 is embedded inside the transition interface 35. The filter screen 36 is made of aluminum alloy wire mesh. The filter screen 36 can block particulate impurities such as lint and dust when cold air is drawn in. The transition interface 35 can be connected to external cold air equipment through a pipe to ensure a stable supply of cold air. The temperature of the cold air delivery equipment can also be adjusted by measuring the temperature of the thermometer 17.

[0036] It should be further noted that several door panels 4 are hinged to the front of the furnace body 1 via door hinges. The door panels 4 cover the opening of the furnace cavity 11. A handle lock 41 is installed on the door panel 4 away from the hinge point. The door panel 4 can play a sealing role when heating in the furnace cavity 11, and the handle lock 41 can ensure the stable installation of the door panel 4.

[0037] It should be further explained that several protective gas ports 2 are fixedly installed through the back of the furnace body 1. One end of the protective gas port 2 is connected to the inside of the furnace cavity 11. A valve 21 is provided on the surface of the protective gas port 2. The valve core of the valve 21 is embedded in the protective gas port 2. Inert gases such as argon can be introduced into the inside of the furnace cavity 11 through the protective gas port 2 to protect the bolt steel when it is heated.

[0038] Operating Method: This solution achieves segmented heating through the symmetrical distribution of heating elements 14 on both sides of the furnace cavity 11. The heating elements 14 are embedded in the ceramic insulation base 12 and insulation sleeve 13, which reduces heat conduction loss to the furnace shell 1 and ensures that the heat is concentrated inside the furnace cavity. The power supply base 15 connects multiple heating elements 14 side by side, and precise temperature control is achieved through an external temperature control switch to avoid local overheating or underheating. Thermometer 17 (thermocouple thermometer) monitors the temperature inside the furnace cavity 11 in real time and feeds the data back to the temperature control system to dynamically adjust the power of the heating elements, so that the bolt steel is heated evenly during spheroidizing annealing. In addition, the insulation sleeve 13 isolates the extended part of the heating elements 14 to further reduce heat loss and ensure the stability of the temperature field inside the furnace cavity 11.

[0039] The protective gas port 2 on the back of the furnace body 1 can be used to introduce inert gases such as argon. Valve 21 controls the gas flow. During the heating process, the inert gas replaces the oxygen in the furnace chamber 11 to prevent oxidation or decarburization of the bolt steel surface. The thermometer 17 and valve 18 work together: when the pressure in the furnace chamber 11 increases due to heating, valve 18 automatically opens to exhaust gas to avoid excessive internal pressure affecting the sealing performance. After annealing, valve 18 can be manually opened to accelerate the discharge of cooling gas. The cold gas pipe 31 delivers external cold gas to each furnace chamber 11 through the air pump 34 after being filtered by the filter screen 36. Valve 33 independently controls the cold gas flow of each furnace chamber to achieve segmented cooling. This design not only protects the surface quality of the steel, but also ensures the safety of the annealing process through the pressure balance system.

[0040] The furnace chamber 11 adopts a multi-chamber independent design. Each chamber is equipped with an independent object placement assembly 16, electric heating tube group and cold air interface 32. The placement slot of the placement plate 1602 fixes the position of the bolt steel, so that it is heated evenly and avoids stacking deformation. After the annealing stage, the air pump 34 injects cold air into the cold air pipe 31 through the transition interface 35 (including aluminum alloy filter screen 36), and distributes it to the designated furnace chamber 11 through valve three 33 to achieve rapid and controllable cooling. The thermometer 17 monitors the cooling curve of each furnace chamber in real time. The operator can adjust the cooling rate of different chambers according to the difference in steel material by adjusting the temperature switch and valve three 33 to meet the needs of spheroidizing annealing for slow cooling or isothermal transformation. The handle lock 41 of the door plate 4 ensures the airtightness of the furnace chamber. The multi-chamber parallel processing design significantly improves the efficiency of batch production and is suitable for segmented heat treatment of bolts of different specifications.

[0041] 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 segmented bolt steel spheroidizing annealing furnace, comprising a furnace body (1), characterized in that: The furnace body (1) has several support legs (10) fixed at its lower end. The furnace body (1) has several furnace cavities (11) inside. Several heat insulation seats (12) are installed on the upper ends of both sides of the inner wall of the furnace cavity (11). Electric heating tubes (14) are inserted and fixed inside the heat insulation seats (12). The same number of heat insulation sleeves (13) as the electric heating tubes (14) are fixed through the lower end of the furnace cavity (11). The surface of the electric heating tubes (14) extends outward through the interior of the heat insulation sleeves (13). The heat insulation seats (12) and heat insulation sleeves (13) are both made of ceramic material. Several electric heating tubes (14) arranged side by side along one side of the furnace cavity (11) are all connected to the same power socket (15) at their lower ends. The furnace cavity (11) is equipped with an object placement assembly (16). The object placement assembly (16) includes a back plate (1601). The lower end of the back plate (1601) is fixed to the bottom of the furnace cavity (11). The object placement assembly (16) has two vertically distributed placement plates (1602) fixed on the side of the object placement assembly (16) facing the opening of the furnace cavity (11). The upper end of the placement plate (1602) is provided with a placement groove.

2. The segmented bolt steel spheroidizing annealing furnace according to claim 1, characterized in that: A thermometer (17) is installed through the upper part of the furnace cavity (11), and the measuring end of the thermometer (17) is located inside the furnace cavity (11).

3. The segmented bolt steel spheroidizing annealing furnace according to claim 1, characterized in that: The upper part of the furnace cavity (11) is also fixed with a valve (18) for exhaust, which is arranged side by side with the thermometer (17).

4. A segmented bolt steel spheroidizing annealing furnace according to claim 1, characterized in that: A tube seat (3) is fixedly installed on one side of the upper end of the furnace body (1) by a bracket, and a cold air pipe (31) is inserted into the inside of the tube seat (3).

5. A segmented bolt steel spheroidizing annealing furnace according to claim 4, characterized in that: The lower end of the cold air pipe (31) is fixed with a number of cold air interfaces (32) matching the number of furnace chambers (11). The cold air interfaces (32) are connected to the furnace body (1) and the furnace chambers (11). A valve three (33) is provided on the surface of the cold air interface (32). The valve core of the valve three (33) is embedded inside the cold air interface (32).

6. A segmented bolt steel spheroidizing annealing furnace according to claim 5, characterized in that: An air pump (34) is fixed to the side of the furnace body (1) away from the tube seat (3) by a bracket. The air outlet of the air pump (34) is connected to the flange of the cold air interface (32) away from the tube seat (3).

7. A segmented bolt steel spheroidizing annealing furnace according to claim 6, characterized in that: The air pump (34) has an air inlet flange with a transition interface (35), and a filter screen (36) is embedded inside the transition interface (35). The filter screen (36) is made of aluminum alloy wire mesh material.

8. A segmented bolt steel spheroidizing annealing furnace according to claim 1, characterized in that: The front of the furnace body (1) is hinged with several door panels (4) by door hinges. The door panels (4) cover the opening of the furnace cavity (11). A handle lock (41) is installed on the door panel (4) away from the hinge point.

9. A segmented bolt steel spheroidizing annealing furnace according to claim 1, characterized in that: Several protective gas ports (2) are fixed through the back of the furnace body (1). One end of the protective gas port (2) is connected to the inside of the furnace cavity (11). A valve (21) is provided on the surface of the protective gas port (2). The valve core of the valve (21) is embedded inside the protective gas port (2).

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