A reinforcing bar rolling apparatus

Abstract

The utility model discloses a reinforcing steel bar rolling equipment for rolling the steel billet into reinforcing steel bar, which comprises a roller set, at least including one of a rough rolling unit, a medium rolling unit and a finishing rolling unit; the rough rolling unit, the medium rolling unit and the finishing rolling unit respectively include a first roller pair, a second roller pair and a third roller pair; a temperature control module, which comprises a cantilever support including a first cross bar and a second cross bar; a temperature detector is installed at one end of the first cross bar close to the steel billet, and the temperature detector is used for monitoring the temperature of the steel billet; a heat supplement ring is installed at one end of the second cross bar close to the steel billet, and the heat supplement ring is connected to a power supply and used for heating the steel billet; wherein, the heat supplement ring is electrically connected to the temperature detector; when the temperature detector monitors that the temperature of the steel billet is lower than a predetermined value, the heat supplement ring heats the steel billet. The utility model uses the temperature detector and the heat supplement ring to cooperate with each other, monitors and controls the temperature of the steel billet, and can improve the rolling quality of the steel billet to a certain extent.

Description

Technical Field

[0001] This utility model relates to the field of steel bar rolling technology, and in particular to a steel bar rolling equipment. Background Technology

[0002] As the primary solid metal product of continuous casting, steel billets play a crucial role in raw material conversion during rebar rolling. Their initial cross-sectional dimensions (e.g., 160mm square billets or Φ200mm round billets) need to be gradually reduced to the target specifications (e.g., Φ16mm ribbed rebar) through multiple hot rolling plastic deformation passes. Simultaneously, the high-temperature rolling process (1050±30℃) eliminates as-cast dendritic structures and refines grains (austenite grain size ≥7), providing a uniform initial microstructure for high-strength rebars such as HRB500E. Ultimately, this ensures that the mechanical properties and cold bending performance of the rebar meet standard requirements.

[0003] In the current steel bar rolling process, insufficient temperature control precision leads to certain fluctuations in steel bar performance. The temperature fluctuation of traditional gas-fired heating methods exceeds ±100℃, while the final rolling temperature of HRB500E needs to be strictly controlled within ±20℃, otherwise the strength-to-yield ratio fluctuation will exceed the standard limit of 0.13.

[0004] It is necessary to provide a rolling mill that can dynamically replenish heat based on the real-time temperature of the billet. Utility Model Content

[0005] To address the above issues and overcome the shortcomings of existing technologies, this invention provides a steel bar rolling device through a three-dimensional spatial decoupling design. This device uses a thermometer and a heating ring in conjunction to monitor and control the temperature of the steel billet, thereby improving the rolling quality to some extent. Specifically, the thermometer and heating ring are staggered vertically to eliminate horizontal magnetic field coupling. Furthermore, along the steel billet's axial direction, the distance between the thermometer and the heating ring is ≥300 mm, allowing the thermometer to avoid the eddy current dissipation field of the heating ring to some extent. The thermometer's line of sight is tilted at a 42°~48° angle to the main radiation direction of the heating ring's magnetic field, allowing the thermometer to enter the electromagnetic sidelobe region, thus achieving attenuation of no less than 10 dB.

[0006] To achieve the above objectives, this utility model provides the following technical solution:

[0007] This utility model provides a steel bar rolling equipment for rolling steel billets into steel bars, comprising:

[0008] A rolling mill assembly, which includes at least one of a roughing mill unit, an intermediate mill unit, and a finishing mill unit;

[0009] The roughing mill unit includes a first roll pair driven by a motor; the intermediate mill unit includes a second roll pair driven by a motor; and the finishing mill unit includes a third roll pair driven by a motor.

[0010] At least one temperature control module includes a cantilever bracket, the cantilever bracket including a first crossbar and a second crossbar; both the first crossbar and the second crossbar extend from the cantilever bracket toward the steel billet; a temperature measuring instrument is installed at the end of the first crossbar near the steel billet, the temperature measuring instrument being used to monitor the temperature of the steel billet; a heat-compensating ring is installed at the end of the second crossbar near the steel billet, the heat-compensating ring being connected to an AC power supply for heating the steel billet;

[0011] in,

[0012] The heating coil is electrically connected to the temperature measuring instrument;

[0013] When the temperature measuring instrument detects that the billet temperature is lower than the predetermined value, the heating coil can heat the billet.

[0014] Furthermore, the thermometer is an industrial temperature sensing device based on the principle of non-contact infrared radiation temperature measurement.

[0015] Furthermore, the heating coil is a medium-frequency inductor based on the principle of electromagnetic induction heating, which generates eddy currents inside the steel billet through a variable frequency power supply.

[0016] Furthermore, the temperature measuring instrument of the temperature control module is located above the steel billet; the heat compensation ring of the temperature control module is located below the steel billet.

[0017] in,

[0018] The distance between the thermometer and the heating coil is 600~1200mm.

[0019] Furthermore, the installation distance between the optical center of the temperature measuring instrument and the near end face of the heat exchanger along the axis of the billet is at least 300 mm.

[0020] Furthermore, the angle between the line of sight of the thermometer and the main radiation direction of the magnetic field of the heating coil is 42°~48°.

[0021] The temperature measuring instrument is located in the sidelobe region where the electromagnetic field attenuation of the heating coil is greater than 10dB.

[0022] Furthermore, the working surface of the heating ring of the temperature control module is 60~100mm away from the steel billet.

[0023] This utility model has at least the following advantages or beneficial effects:

[0024] In this invention, the temperature measuring instrument and the heating coil are connected via signal transmission. When the temperature measuring instrument detects that the billet temperature is lower than a set threshold, the heating coil executes a heating operation based on a control command. The response time from the temperature measuring instrument detecting the billet temperature to the heating coil starting to heat is less than 1 second, thus enabling immediate reheating of the billet and improving the yield.

[0025] In this invention, the thermometer and the heating ring are arranged in a vertically offset manner: the thermometer is placed above the steel billet, and the heating ring is placed below the steel billet, so as to eliminate horizontal magnetic field coupling; along the rolling axis, the axial offset of the optical center of the thermometer relative to the near-end reference plane of the heating ring is ≥300mm, which can avoid eddy current dissipation field to a certain extent; the line of sight of the thermometer forms an angle of 42°~48° with the main radiation direction of the magnetic field of the heating ring, so that it is in the sidelobe region where the electromagnetic field attenuation value is greater than 10dB. Attached Figure Description

[0026] To more clearly illustrate the technical solutions in the embodiments of this application or the prior art, the drawings used in the description of the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this application. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0027] Figure 1 This is a schematic diagram of the steel bar rolling equipment of this utility model (the motor driving the rolling rollers and other equipment that are common knowledge are not shown in the figure).

[0028] Figure 2 This is a schematic diagram of the temperature control module structure of this utility model;

[0029] Figure 3 for Figure 2 A schematic diagram of the front view of the central temperature control module;

[0030] Figure label:

[0031] 1-Steel billet;

[0032] 2-Roll set; 21-Roughing unit; 211-First roll pair; 22-Intermediate rolling unit; 221-Second roll pair; 23-Finishing unit; 231-Third roll pair;

[0033] 3-Temperature control module; 31-Cantilever bracket; 311-First crossbar; 312-Second crossbar; 32-Thermometer; 33-Heating coil; Detailed Implementation

[0034] The present invention will be further described below with reference to the accompanying drawings and embodiments.

[0035] It should be noted that the following detailed descriptions are exemplary and intended to provide further illustration of this application. Unless otherwise specified, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application pertains.

[0036] It should be noted that the terminology used herein is for the purpose of describing particular embodiments only and is not intended to limit the exemplary embodiments according to this application. As used herein, the singular form is intended to include the plural form as well, unless the context clearly indicates otherwise. Furthermore, it should be understood that when the terms "comprising" and / or "including" are used in this specification, they indicate the presence of features, steps, operations, devices, components, and / or combinations thereof.

[0037] In this utility model, terms such as "upper", "lower", "left", "right", "front", "back", "vertical", "horizontal", "side", and "bottom" indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only used to facilitate the description of the structural relationship between the various parts or elements of this utility model and do not specifically refer to any part or element in this utility model. They should not be construed as limitations on this utility model.

[0038] In this utility model, terms such as "fixed", "connected", and "linked" should be interpreted broadly, indicating that it can be a fixed connection, an integral connection, or a detachable connection; it can be a direct connection or an indirect connection through an intermediate medium. For relevant scientific researchers or technicians in this field, the specific meaning of the above terms in this utility model can be determined according to the specific circumstances, and should not be construed as a limitation of this utility model.

[0039] The embodiments of this utility model will be described in detail below.

[0040] This utility model discloses a steel bar rolling equipment.

[0041] Figure 1 This is a schematic diagram of the steel bar rolling equipment of this utility model. Only equipment related to the core content of the embodiments of this utility model is shown in this diagram; necessary equipment involved in the entire steel bar rolling production process that belongs to the prior art is not shown. As can be seen from the diagram, the embodiments of this utility model mainly include a steel billet 1 as the raw material for steel bar rolling. After the steel billet 1 passes through the roll group 2, its cross-sectional size is reduced, thereby obtaining steel bars and other products.

[0042] Rolling mill 2 includes roughing mill unit 21, intermediate mill unit 22, and finishing mill unit 23.

[0043] The roughing rolling unit 21 consists of multiple first roll pairs 211. In this embodiment, only one first roll pair 211 is shown. The roughing rolling unit performs an initial large deformation reduction on the steel billet, and implements a single-pass reduction rate of 11%-25% in the austenite recrystallization zone at 1050±30℃ (e.g., rolling the cross-sectional diameter of the steel billet from 160mm to 40mm). The coarse-grained structure in the cast state is broken up by a rolling force of 2800kN, providing a uniform intermediate billet for subsequent rolling.

[0044] The intermediate rolling unit 22 is composed of multiple second roll pairs 221. In this embodiment, only two second roll pairs 221 are shown. The intermediate rolling unit implements a cumulative reduction rate of 40%-60% on the roughing intermediate billet (e.g., rolling the cross-sectional diameter of the billet from 40mm to 20mm), and controls the rolling to refine the grains in the non-recrystallization zone at 890-920℃, while simultaneously pre-rolling transverse ribs to achieve transition diameter reduction and preliminary rib formation.

[0045] The finishing rolling unit 23 consists of multiple third roll pairs 231. In this embodiment, only two third roll pairs 231 are shown. The finishing rolling unit completes the precision forming of the finished product, controlling the ferrite phase transformation with a final rolling reduction rate of 8%-12% (e.g., rolling the cross-sectional diameter of the steel billet from 20mm to 16mm) and a final rolling temperature of 860±10℃, to ensure the mechanical property requirements of high rib precision and strength-to-yield ratio.

[0046] In this system, each roll in the first roll assembly 211, the second roll assembly 221, and the third roll assembly 231 is driven by a motor. The motor is existing technology. Figure 1 The transmission structure between the motor and the first roll pair 211, the second roll pair 221, and the third roll pair 231 is not shown in the figure.

[0047] Temperature control modules 3 are installed near the roughing rolling unit 21, intermediate rolling unit 22, and finishing rolling unit 23. The temperature control modules 3 are mainly used to monitor the temperature of the billet 1 during the rolling process and also have the function of heating the billet 1. The temperature control modules 3 mainly include a cantilever support 31, a thermometer 32, and a heat exchanger 33. The cantilever support 31 is equipped with a first crossbar 311 and a second crossbar 312 extending towards the billet 1. A thermometer 32 is installed at the end of the first crossbar 311 near the billet 1; a heat exchanger 33 is installed at the end of the second crossbar 312 near the billet 1. The thermometer 32 and the heat exchanger 33 are electrically connected and exchange electrical signals. The thermometer 32 is used to monitor the temperature of the billet 1 in its vicinity; the heat exchanger 33 is used to heat the billet 1 in its vicinity. The temperature measuring instrument 32 is located above the steel billet 1, while the heat-repairing ring 33 is located below the steel billet 1; the straight-line distance between the temperature measuring instrument 32 and the heat-repairing ring 33 is 600~1200mm. The steel billet 1 is spaced between the heat-repairing ring 33 and the temperature measuring instrument 32, which can reduce the influence of the heat-repairing ring 33 on the temperature measuring instrument 32 to a certain extent.

[0048] The temperature measuring instrument 32 can be an industrial temperature sensing device based on the principle of non-contact infrared radiation temperature measurement; the heating coil 33 can be a medium-frequency inductor based on the principle of electromagnetic induction heating, which excites eddy currents inside the steel billet 1 through a frequency converter, thereby heating the steel billet 1. To improve the heating performance of the heating coil 33, the distance between the working surface of the heating coil 33 and the steel billet 1 is 60~100mm, and this distance range ensures that the electromagnetic coupling efficiency is not less than 85%. In this embodiment, the distance between the working surface of the heating coil 33 and the steel billet 1 is 80mm, and this design ensures that the conversion rate of electrical energy to eddy current heat is not less than 80%.

[0049] To further reduce the impact of the heat exchanger 33 on the temperature measuring instrument 32, the installation distance between the optical center of the temperature measuring instrument 32 and the near-end face of the heat exchanger 33 in the same group along the axial direction of the billet 1 is at least 300 mm. In this embodiment, the distance between the optical center of the temperature measuring instrument 32 and the near-end face of the heat exchanger 33 along the axial direction of the billet 1 is 350 mm. The axial spacing of 350 mm between the temperature measuring instrument 32 and the heat exchanger 33 keeps the temperature measuring instrument 32 away from the core area of ​​the strong eddy current dissipation field of the heat exchanger 33, while increasing the oblique distance of the heat radiation transfer path, thereby reducing the impact of the heat exchanger 33 on the temperature measuring instrument 32.

[0050] Furthermore, the angle between the line of sight of the thermometer 32 and the main radiation direction of the magnetic field of the heating coil 33 (normal to the coil axis) is 42°~48°. The thermometer 32 is located in the sidelobe region where the electromagnetic field attenuation of the heating coil 33 is greater than 10dB. In this embodiment, the angle between the line of sight of the thermometer 32 and the main radiation direction of the magnetic field of the heating coil 33 (normal to the coil axis) is 45°.

[0051] Therefore, during the rolling process of billet 1, it is necessary to ensure that the temperature of billet 1 remains within a preset range as it passes through the roughing unit 21, intermediate rolling unit 22, and finishing rolling unit 23. When the temperature of billet 1 entering the roughing unit 21, intermediate rolling unit 22, or finishing rolling unit 23 is higher than the preset temperature, the motor speed can be reduced, thereby reducing the moving speed of billet 1 and appropriately extending the time for billet 1 to enter the roughing unit 21, intermediate rolling unit 22, or finishing rolling unit 23, thus allowing billet 1 to cool down. When the temperature of billet 1 entering the roughing unit 21, intermediate rolling unit 22, or finishing rolling unit 23 is lower than the preset temperature, the heating coil 33 in the temperature control module 3 is activated to heat billet 1 during the rolling process, so that the temperature of billet 1 enters the preset range.

[0052] The above description is merely a preferred embodiment of this application and is not intended to limit this application. Various modifications and variations can be made to this application by those skilled in the art. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of this application should be included within the protection scope of this application.

Claims

1. A steel bar rolling equipment for rolling steel billets (1) into steel bars, characterized in that, include: A roll group (2) comprising at least one of a roughing unit (21), an intermediate rolling unit (22), and a finishing unit (23); The roughing unit (21) includes a first roll pair (211) driven by a motor; the intermediate rolling unit (22) includes a second roll pair (221) driven by a motor; and the finishing rolling unit (23) includes a third roll pair (231) driven by a motor. At least one temperature control module (3) includes a cantilever bracket (31), the cantilever bracket (31) including a first crossbar (311) and a second crossbar (312); the first crossbar (311) and the second crossbar (312) both extend from the cantilever bracket (31) toward the billet (1); a thermometer (32) is installed at the end of the first crossbar (311) near the billet (1), the thermometer (32) is used to monitor the temperature of the billet (1); a heat-compensating ring (33) is installed at the end of the second crossbar (312) near the billet (1), the heat-compensating ring (33) is connected to an AC power source, and is used to heat the billet (1); in, The heating coil (33) is electrically connected to the temperature measuring instrument (32); When the temperature measuring instrument (32) detects that the temperature of the billet (1) is lower than the predetermined value, the heating coil (33) can heat the billet (1).

2. The steel bar rolling equipment according to claim 1, characterized in that, The thermometer (32) is an industrial temperature sensing device based on the principle of non-contact infrared radiation temperature measurement.

3. The steel bar rolling equipment according to claim 1, characterized in that, The heating coil (33) is a medium-frequency inductor based on the principle of electromagnetic induction heating, which generates eddy currents inside the billet (1) through a variable frequency power supply.

4. The steel bar rolling equipment according to any one of claims 1 to 3, characterized in that, The temperature measuring instrument (32) of the temperature control module (3) is located above the steel billet (1); the heat exchanger (33) of the temperature control module (3) is located below the steel billet (1); in, The distance between the thermometer (32) and the heating coil (33) is 600~1200mm.

5. The steel bar rolling equipment according to any one of claims 1 to 3, characterized in that, The optical center of the thermometer (32) is installed at a distance of at least 300 mm from the near end face of the heat exchanger (33) along the axis of the billet (1).

6. The steel bar rolling equipment according to any one of claims 1 to 3, characterized in that, The angle between the line of sight of the thermometer (32) and the main radiation direction of the magnetic field of the heating coil (33) is 42°~48°. The thermometer (32) is located in the sidelobe region where the electromagnetic field attenuation of the heating coil (33) is greater than 10dB.

7. The steel bar rolling equipment according to any one of claims 1 to 3, characterized in that, The working surface of the heating ring (33) of the temperature control module (3) is 60~100mm away from the steel billet (1).

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