Steel belt heat treatment equipment

Abstract

The utility model relates to steel belt heat treatment equipment which comprises an annular steel belt supply line and a heat treatment tunnel furnace matched with the annular steel belt supply line, the annular steel belt supply line comprises a driving frame roller and a driven frame roller which are arranged at the front end and the rear end of the heat treatment tunnel furnace, and an annular steel belt which is driven among the driving frame roller, the driven frame roller and the supporting frame rollers; the driving frame roller comprises a driving side frame body and a power roller mounted on the driving side frame body, and the driven frame roller comprises a driven side frame body and a driven roller mounted on the driven side frame body; the heat treatment tunnel furnace comprises a lower furnace body located below the upper-layer steel belt and an upper furnace cover located above the upper-layer steel belt, and a heat treatment channel is arranged in the furnace body. According to the utility model, through the adaptive design of the annular steel belt supply line and the heat treatment tunnel furnace, the steel belt enters the heat treatment tunnel furnace for heat treatment in an annular posture at a certain advancing speed, the deformation of the steel belt is small, and the stress concentration or shaping effect cannot be generated.

Description

Technical Field

[0001] This utility model relates to a heat treatment device for steel strip, belonging to the technical field of heat treatment equipment for steel strip. Background Technology

[0002] Circular steel strips are widely used in the conveying and transporting processes of industrial equipment. Heat treatment is an important means to meet the required mechanical, physical, and chemical properties of the steel strips. Existing steel strip heat treatment equipment generally uses bell-type or box-type heat treatment furnaces, directly feeding the entire coil of steel strip into the furnace for heat treatment. The disadvantages of this method are that it causes inconsistent heating curves between the outer and inner rings of the steel coil, uneven heating, inconsistent hardness, significant shaping effect, and difficulty in uncoiling the heat-treated steel coil. Summary of the Invention

[0003] The present invention aims to solve the various problems mentioned above, and thus provide a steel strip heat treatment equipment with optimized structure and good heat treatment effect.

[0004] To solve the above problems, the technical solution adopted by this utility model is as follows:

[0005] A steel strip heat treatment device is characterized by including an annular steel strip supply line that keeps the steel strip in an annular position, and a heat treatment tunnel furnace adapted to the annular steel strip supply line. The steel strip is fed into the heat treatment tunnel furnace in an annular position through the annular steel strip supply line for heat treatment, so as to achieve a better steel strip heat treatment effect.

[0006] The annular steel strip supply line includes active and driven rollers arranged at the front and rear ends of the heat treatment tunnel furnace, and an annular steel strip that is driven between the active rollers, driven rollers and each support roller.

[0007] The active frame roller includes an active side frame and a power roller mounted on the active side frame. The power roller is driven by a motor and a reducer. The two shaft ends of the power roller are respectively mounted on the support beams on both sides of the active side frame through bearing seats. The driven frame roller includes a driven side frame and a driven roller mounted on the driven side frame. The position of the driven roller is relatively fixed, and its power torque comes from the annular steel belt.

[0008] The heat treatment tunnel furnace includes a lower furnace body located below the upper steel strip and an upper furnace cover located above the upper steel strip. The furnace body is equipped with a heat treatment channel. The furnace cavity is divided into several temperature control zones that are corresponding to each other and grouped in pairs. The front end of the furnace body is a rapid heating zone, and its furnace chamber is equipped with dense electric heating tubes. Behind the rapid heating zone is a heat preservation zone, and the electric heating tubes inside the furnace chamber of the heat preservation zone are relatively dispersed. The furnace body is equipped with a fan to turbulently disperse the heat.

[0009] Furthermore, in order to adapt to steel strips of different specifications, the distance between the driving roller and the driven roller is adjustable, and the bearing seat and the support beam are slidably connected through a hydraulic cylinder, a slider, and a guide rail; the hydraulic cylinder is fixed on the active side frame, and its output rod end is fixedly connected to the bearing seat on one side of the driving roller. A slider is installed below the bearing seat and slides with the guide rail installed on the support beam through the slider, and the bearing seat is driven to slide on the support beam by the hydraulic cylinder.

[0010] Furthermore, a plurality of support rollers are arranged at predetermined intervals between the active and driven rollers. The support rollers are used to support the annular steel strip between the active and driven rollers. They include an upper support shaft mounted on an upper support frame and a lower support shaft mounted on a lower support frame. The upper support shaft is used to support and roll in contact with the upper steel strip, and the lower support shaft is used to support and roll in contact with the lower steel strip.

[0011] Furthermore, the heat treatment tunnel furnace also includes a furnace cover lifting mechanism, which includes a lifting gantry and several lifting beams located above the lifting gantry. Each lifting beam is equipped with a pair of lifting components. The lifting components include a motor and a worm gear driven and controlled by the motor. The worm gear serves as a lifting rod, and its end is fixedly connected to the upper furnace cover through a connector.

[0012] This utility model discloses a steel strip heat treatment device. Through the adaptive design of the annular steel strip supply line and the heat treatment tunnel furnace, the steel strip enters the heat treatment tunnel furnace in an annular posture and at a certain speed for heat treatment. Under the action of the furnace cover lifting mechanism, the upper furnace cover can perform vertical lifting and lowering movements. During heat treatment, the upper furnace cover and the lower furnace body are closed; after heat treatment, the upper furnace cover is raised for ventilation and heat dissipation. During the heat treatment process, the steel strip is heat-treated under annular belt tension, resulting in minimal deformation and preventing stress concentration or shaping effects. Attached Figure Description

[0013] Figure 1 : Schematic diagram of the overall structure of the heat treatment equipment in Example 1;

[0014] Figure 2 Schematic diagram of the active roller structure of the steel strip supply line;

[0015] Figure 3 Schematic diagram of the support frame roller structure of the steel strip supply line;

[0016] Figure 4 Schematic diagram of the furnace cover lifting mechanism. Detailed Implementation

[0017] The present invention will now be described in detail with reference to the accompanying drawings.

[0018] Example 1

[0019] This embodiment relates to a heat treatment device for improving the mechanical properties of 07Cr15Ni7Mo2Al martensitic precipitation hardening stainless steel strip. It aims to solve the problem that temperature changes and different morphologies of the strip during heat treatment have an adverse effect on the mechanical properties and morphology of the stainless steel.

[0020] This embodiment describes a heat treatment device for improving the mechanical properties of 07Cr15Ni7Mo2Al martensitic precipitation hardening stainless steel strip. Its main functional structure includes two parts: an annular steel strip supply line and a heat treatment tunnel furnace.

[0021] The annular steel strip supply line provides power to the steel strip, enabling it to rotate clockwise or counterclockwise in a circular motion on the production line. The tunnel furnace is installed in the middle of the annular steel strip supply line, and the upper layer of steel strip always passes slowly through the tunnel furnace until the entire steel strip has completed heat treatment.

[0022] The annular steel strip supply line includes active frame rollers 1 and driven frame rollers 2 arranged at the front and rear ends of the heat treatment tunnel furnace, a number of support frame rollers 3 arranged at predetermined intervals between the active frame rollers 1 and driven frame rollers 2, and an annular steel strip 4 that drives the active frame rollers 1, driven frame rollers 2, and each support frame roller 3. The active frame roller 1 includes an active side frame 11 and a power roller 12 mounted on the active side frame 11. The power roller 12 is driven by a motor and a reducer 13. The two shaft ends of the power roller 12 are respectively mounted on the support rollers on both sides of the active side frame 11 through bearing seats 14. On the support beam 15, and in order to adapt to steel strips of different specifications, the bearing seat 14 and the support beam 15 are slidably connected through a hydraulic cylinder 16, a slider 17, and a guide rail 18. Specifically, the hydraulic cylinder 16 is fixed on the active side frame 11, and its output rod end is fixedly connected to the bearing seat 14 on one side of the power roller 12. The slider 17 is installed below the bearing seat 14 and slides with the guide rail 18 installed on the support beam 15 through the slider 17. The hydraulic cylinder 16 drives the bearing seat 14 to slide on the support beam 15, thereby making the position of the power roller 12 adjustable. The driven frame roller 2 includes a driven side frame 21 and a driven roller 22 installed on the driven side frame 11. The position of the driven roller 22 is relatively fixed, and its power torque comes from the annular steel strip 4. The support frame roller 3 is used to support the annular steel strip 4 between the driving frame roller 1 and the driven frame roller 2. It includes an upper support shaft 33 installed on the upper support frame 31 and a lower support shaft 34 installed on the lower support frame 32. The upper support shaft 33 is used to support and roll in contact with the upper steel strip, and the lower support shaft 34 is used to support and roll in contact with the lower steel strip.

[0023] The heat treatment tunnel furnace includes a lower furnace body 5, an upper furnace cover 6, and a furnace cover lifting mechanism 7. After the upper furnace cover 6 is fitted to the lower furnace body 5, it forms a heat treatment channel for the fitted annular steel strip 4. The lower furnace body 5 is located below the upper steel strip, and the upper furnace cover 6 is located above the upper steel strip. In this embodiment, the furnace cavity is divided into eight temperature control zones, with each zone forming a pair, acting on the area above and below the upper steel strip. Temperature control zones 1 and 2 are located at the front of the furnace body, and their furnace chambers are equipped with relatively dense electric heating tubes, forming a rapid heating zone 9. Temperature control zones 3 and 4, 5 and 6, and 7 and 8 are sequentially arranged behind the rapid heating zone, forming a heat preservation zone 10. The electric heating tubes inside the furnace chamber of the heat preservation zone are relatively dispersed. Four fans 8 are sequentially arranged inside the upper furnace cover 6. These fans 8 are used to turbulently disperse the heat inside the furnace chamber, making the heat more even.

[0024] The furnace cover lifting mechanism 7 includes a lifting gantry 71 and several lifting beams 72 located above the lifting gantry 71. Each lifting beam 72 is equipped with a pair of lifting components. Each lifting component includes a motor 73 and a worm gear driven and controlled by the motor 73. The worm gear serves as a lifting rod 74, and its end is fixed to the upper furnace cover 6 via a connector. Under the action of the furnace cover lifting mechanism 7, the upper furnace cover 6 can perform vertical lifting and lowering movements. During heat treatment, the upper furnace cover 6 is closed to the lower furnace body 5. After heat treatment, the upper furnace cover 6 is raised for ventilation and heat dissipation. During the heat treatment process, the steel strip is heat-treated under annular belt tension, resulting in small deformation of the steel strip and preventing stress concentration or shaping effects.

[0025] This embodiment describes a heat treatment device for improving the mechanical properties of 07Cr15Ni7Mo2Al martensitic precipitation hardening stainless steel strip. The heat treatment process includes three stages: the first stage is the solution normalizing stage, the second stage is the heat holding stage, and the third stage is the cooling stage.

[0026] First stage: After cold rolling, the solution-treated martensitic precipitation-hardening stainless steel coils are uncoiled and fed into a tunnel heat treatment furnace via a ring-shaped steel strip supply line, where they are heated to 650°C within 30 minutes.

[0027] Second stage: Heat treatment furnace at 650℃ for 120 minutes.

[0028] Third stage: After the time is up, the air cools to room temperature.

[0029] When the heating rate is too low, the heating time is too long; when the heating rate is too high, defects such as cracks are likely to appear on the surface of the steel strip; when the temperature of the steel strip is too low, Cu atoms will not precipitate, and when the temperature of the steel strip is too high, ε-Cu precipitate will be formed directly; when the holding time is too short, Cu atoms will not precipitate, and when the holding time is too long, ε-Cu precipitate will be formed directly.

[0030] In practice, this method can increase the hardness of 07Cr15Ni7Mo2Al from less than 45HRC to 48-50HRC, saving processes, conserving energy, and reducing costs.

[0031] This utility model is not limited to the embodiments discussed above. The above description of specific embodiments is intended to describe and illustrate the technical solutions involved in this utility model. Obvious variations, substitutions, or combinations based on the teachings of this utility model should also be considered to fall within the protection scope of this utility model. The above specific embodiments are used to disclose the best implementation method of this utility model, so that those skilled in the art can apply various embodiments and alternative methods of this utility model to achieve the purpose of this utility model.

Claims

1. A heat treatment device for steel strip, characterized in that, The system includes an annular steel strip supply line that keeps the steel strip in an annular posture, and a heat treatment tunnel furnace adapted to the annular steel strip supply line. The annular steel strip supply line includes active and driven support rollers arranged at the front and rear ends of the heat treatment tunnel furnace, and an annular steel strip that is driven between the active support roller, the driven support roller and each support roller. The active frame roller includes an active side frame and a power roller mounted on the active side frame. The power roller is driven by a motor and a reducer. The two shaft ends of the power roller are respectively mounted on the support beams on both sides of the active side frame through bearing seats. The driven frame roller includes a driven side frame and a driven roller mounted on the driven side frame. The position of the driven roller is relatively fixed, and its power torque comes from the annular steel belt. The heat treatment tunnel furnace includes a lower furnace body located below the upper steel strip and an upper furnace cover located above the upper steel strip. The furnace body is equipped with a heat treatment channel. The furnace cavity is divided into several temperature control zones that are corresponding to each other and grouped in pairs. The front end of the furnace body is a rapid heating zone, and its furnace chamber is equipped with dense electric heating tubes. Behind the rapid heating zone is a heat preservation zone, and the electric heating tubes inside the furnace chamber of the heat preservation zone are relatively dispersed. The furnace body is equipped with a fan to turbulently disperse the heat.

2. The steel strip heat treatment equipment as described in claim 1, characterized in that, The distance between the driving roller and the driven roller is adjustable. The bearing seat and the support beam are slidably connected by a hydraulic cylinder, a slider, and a guide rail. The hydraulic cylinder is fixed on the active side frame, and its output rod end is fixedly connected to the bearing seat on one side of the driving roller. A slider is installed below the bearing seat and slides with the guide rail installed on the support beam through the slider. The bearing seat is driven to slide on the support beam by the hydraulic cylinder.

3. The steel strip heat treatment equipment as described in claim 1, characterized in that, A plurality of support rollers are arranged at predetermined intervals between the active and driven rollers. The support rollers are used to support the annular steel strip between the active and driven rollers. They include an upper support shaft mounted on an upper support frame and a lower support shaft mounted on a lower support frame. The upper support shaft is used to support and roll in contact with the upper steel strip, and the lower support shaft is used to support and roll in contact with the lower steel strip.

4. The steel strip heat treatment equipment as described in claim 1, characterized in that, The heat treatment tunnel furnace also includes a furnace cover lifting mechanism, which includes a lifting gantry and several lifting beams located above the lifting gantry. Each lifting beam is equipped with a pair of lifting components. The lifting components include a motor and a worm gear driven and controlled by the motor. The worm gear serves as a lifting rod, and its end is fixedly connected to the upper furnace cover through a connector.

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