Vertical heating furnace for pit type roller shell hot charging

Abstract

The invention provides a vertical heating furnace for pit type roller shell hot charging, and belongs to the technical field of metallurgical rollers. The furnace comprises a furnace body; a furnace cover; the furnace lining is used for storing heat; the measurement control system is used for measuring the temperature and swelling capacity of the outer surface of the roller sleeve; the at least one layer of operation platform is used for operators to observe and operate; the roller sleeve supporting base is arranged between the lower pit and the upper pit; the roller sleeve bottom supporting bracket is arranged on the roller sleeve supporting base; one end of the first spiral compression spring is arranged on the roller sleeve bottom supporting bracket, and the other end supports the outer side annular spiral compression spring bracket; a heat circulation ventilation opening is formed between the roller sleeve supporting base and the roller sleeve bottom supporting bracket; a lower pit heating system and an upper pit heating system are arranged in the lower pit and the upper pit correspondingly and used for heating the roller sleeve. The lifting height can be effectively reduced, the safety of the lifting process can be improved, the pit type heating furnace is low in investment and good in heat preservation performance, and energy consumption can be greatly reduced.

Description

Technical Field

[0001] The invention relates to the technical field of metallurgical rollers, in particular to a vertical heating furnace for hot-charging a pit-type roller sleeve. Background Art

[0002] The backup rolls in large, heavy plate mills often have barrel lengths exceeding 5 meters (up to 5.5 meters), and the total length of the rolls exceeds 10 meters. During the shrink-fit process, the roll shafts, each exceeding 10 meters in length, must be vertically inserted into the inner bore of the roll sleeve. Simultaneously, the sleeves themselves must be heated in a heating furnace. Given the height limitations of the pit furnace and crane cranes, traditional plant structures are unable to meet the requirements of shrink-fitting backup rolls in large, heavy plate mills. Summary of the Invention

[0003] In view of this, in order to solve the technical problem that the hot installation and sleeve insertion of the support rolls of large wide and thick plate rolling mills cannot be completed in traditional factory buildings, the present invention provides a pit-type vertical heating furnace for hot installation of roll sleeves, which is used for hot installation of large support roll sleeves. It can effectively reduce the lifting height and is conducive to improving the safety of the lifting process. The pit-type heating furnace has low investment and good thermal insulation performance, which can greatly reduce energy consumption. Through the measurement and control system, precise control of the roll sleeve heating process is achieved, and at least one operating platform is designed to facilitate real-time monitoring of detection data at different positions of the roll sleeve and inspection and maintenance of the heating furnace.

[0004] To achieve the above object, the present invention provides the following technical solutions: A vertical heating furnace for hot-loading of pit-type roller sleeves, comprising: The furnace body consists of a lower pit and an upper pit; A furnace cover, used to cover the furnace body for heat preservation; A furnace lining is provided in the furnace body and is used for heat storage; Measurement and control system, used to measure the temperature and expansion of the outer surface of the roller sleeve and perform control according to the temperature and expansion; At least one operating platform for operators to observe and operate; A roller sleeve supporting base is arranged between the lower pit and the upper pit; The roller sleeve bottom support bracket is arranged on the roller sleeve support base; A helical compression spring, one end of which is arranged on the bottom support bracket of the roller sleeve, and the other end of which supports the outer annular helical compression spring bracket; A heat circulation vent is provided between the roller sleeve support base and the roller sleeve bottom support bracket; The lower pit and the upper pit are respectively provided with a lower pit heating system and an upper pit heating system for heating the roller sleeve.

[0005] Preferably, the lower pit heating system includes: a first ceramic fiber thermal insulation material, disposed at the bottom of the lower pit; a second ceramic fiber thermal insulation material, laid on top of the ceramic fiber thermal insulation material; A high-temperature insulating and heat-resistant ceramic chassis is arranged above the high-aluminum ceramic fiber insulation material; The bottom of the lower pit is heated by a high-temperature nickel-chromium electric heating wire, which is circumferentially arranged near the high-temperature insulating heat-resistant ceramic chassis to heat the inner wall of the roller sleeve; High-temperature clay refractory bricks are circumferentially arranged around the high-temperature nickel-chromium heating wire used for heating the bottom of the lower pit; The third ceramic fiber insulation material is circumferentially arranged in the high temperature insulating heat-resistant ceramic chassis The lower pit is circumferentially heated by a high-temperature nickel-chromium heating wire, which is circumferentially arranged on the side wall of the lower pit; The high-temperature insulating heat-resistant ceramic tray of the heating wire is arranged in the lower pit to circumferentially heat the high-temperature nickel-chromium heating wire.

[0006] Preferably, a high-temperature insulating sleeve for the heating wire at the bottom of the pit is provided at the bottom of the pit; The side wall of the lower pit is provided with a lower pit circumferential electric heating wire high-temperature insulation sleeve.

[0007] Preferably, the upper pit heating system includes: A high-temperature nickel-chromium heating wire is used to heat the outer wall of the upper pit roller sleeve, which is circumferentially arranged on the side wall of the upper pit and is used to heat the outer wall of the roller sleeve; The fourth ceramic fiber thermal insulation material and the fifth ceramic fiber thermal insulation material are circumferentially arranged on the side wall of the upper pit and are located outside the high-temperature nickel-chromium heating wire used for heating the outer wall of the upper pit roller sleeve; The pit mouth is surrounded by high-temperature clay refractory bricks and is installed around the edge of the furnace mouth.

[0008] Preferably, the measurement and control system includes: A high-temperature ceramic insulating sleeve passes through the side wall of the upper pit; A roller sleeve thermal expansion measuring rod, one end of which passes through the high-temperature ceramic insulating sleeve and is used to measure the change in the roller sleeve diameter; A roller sleeve thermal expansion measuring scale is provided near the other end of the roller sleeve thermal expansion measuring rod and has a numerical scale; a roller sleeve thermal expansion measurement pointer, one end of which is connected to the other end of the roller sleeve thermal expansion measurement rod, and the other end of which is used to indicate the scale on the roller sleeve thermal expansion measurement scale; a thermocouple thermometer, one end of which passes through the high-temperature ceramic insulating sleeve and is used to measure the temperature of the outer surface of the roller sleeve; A display screen, connected to the other end of the thermocouple thermometer, for displaying the temperature of the outer surface of the roller sleeve in real time; The display screen is provided with a control element, which is at least used to control the lower pit heating system and the upper pit heating system.

[0009] Preferably, in order to ensure the temperature measurement accuracy, a pressing force is applied to the thermocouple temperature measuring head through the second helical compression spring and the insulating spring bracket, so that the thermocouple temperature measuring head needs to be tightly attached to the outer surface of the roller sleeve.

[0010] Preferably, the operating platform has four layers, namely: a first layer operating platform, a second layer operating platform, a third layer operating platform and a fourth layer operating platform.

[0011] Preferably, the operating platform is fixed by supporting columns and hollow columns.

[0012] Preferably, it also includes: The shrink-fit guide device support and the heating furnace door opening and closing adjustment track are used to guide the insertion of the roller sleeve and roller shaft and adjust the opening and closing degree of the furnace door respectively.

[0013] Compared with the prior art, the present invention has the following beneficial effects: (1) The vertical heating furnace for hot installation of roller sleeves provided by the present invention is used for hot installation of large supporting roller sleeves, which can effectively reduce the lifting height and is conducive to improving the safety of the lifting process. The heating furnace is specially designed for hot installation of large supporting roller sleeves. The pit design greatly reduces the lifting height, thereby reducing the risk during the lifting process and improving the safety of the operation. In addition, the pit heating furnace has low investment and good thermal insulation performance, which can greatly reduce energy consumption. The pit heating furnace has a compact structure and relatively low manufacturing cost. At the same time, its excellent thermal insulation performance effectively reduces heat loss, reduces energy consumption, and improves energy utilization efficiency. In addition, the roller sleeve heating process can be precisely controlled through the measurement and control system. Through the equipped measurement and control system, the heating furnace can achieve precise control of the roller sleeve heating process, ensure uniform heating of the roller sleeve, and improve product quality and production efficiency. In addition, at least one operating platform is designed to facilitate real-time monitoring of detection data at different positions of the roller sleeve and inspection and maintenance of the heating furnace. The design of the operating platform enables staff to conveniently monitor the detection data at different positions of the roller sleeve in real time, and is also conducive to the daily inspection and maintenance of the heating furnace, thereby improving the reliability and service life of the equipment.

[0014] (2) Break through height restrictions and save reconstruction costs.

[0015] Due to the height limitations of pit furnaces and cranes, shrink-fitting the extra-large backup roll sleeves for large, wide, and heavy plate mills is difficult in traditional mills. The use of a pit-type heating furnace effectively overcomes this challenge. This design eliminates the need for significant factory and crane reconstruction and can be completed in-situ within the existing mill with minimal investment, significantly reducing costs.

[0016] (3) The advantages of using heat circulation ventilation hole design for the bottom support seat of the roller sleeve in the pit-type vertical heating furnace are mainly reflected in: This design ensures forced convection heat circulation between the inner and outer surfaces of the roller sleeve during heating, effectively promoting even heat distribution. This helps maintain consistent temperature variations between the inner and outer surfaces of large roller sleeves during heating, significantly reducing thermal stress and strain generated during heating. This feature not only improves heating efficiency but also extends the service life of the roller sleeve, enhancing the stability and reliability of the equipment.

[0017] (4) Thermocouple thermometers and thermal expansion measuring rods are installed at different locations on the outer surface of the roller sleeve and on the bottom of the roller sleeve at the opening of the heating furnace. This setting can monitor the dynamic changes in the roller sleeve temperature and thermal expansion in real time during the heating process. Through such monitoring, the heating process can be precisely controlled to ensure the stability and efficiency of the heating process.

[0018] (5) The heating furnace achieves flexible heating control through the measurement and control system. The measurement and control system can be used to independently control the bottom of the lower pit, the circumferential side of the lower pit, and the circumference of the upper pit. This design enables the heating furnace to adopt different heating process parameters according to the requirements of roller sleeves of different specifications. This flexibility not only improves the efficiency and accuracy of heating, but also ensures that the roller sleeve is evenly heated during the heating process, avoiding quality problems caused by uneven heating. Therefore, the heating furnace has significant advantages in the field of roller sleeve heating.

[0019] (6) The vertical heating furnace for hot-loading roller sleeves of the present invention is an ultra-energy-saving, periodically operated pit-type furnace. It is insulated by high-purity ceramic fiber. The material of the fiber is of high standard. The furnace lining insulation design is more energy-efficient, saving 30% to 50% of electricity compared with similar products. The vertical heating furnace for hot-loading roller sleeves of the present invention can be used for annealing, quenching, tempering and other heat treatments of metal rings such as alloy steel, high chromium steel and high manganese steel. The power is optional from 350 to 2800kW; the furnace diameter is Ф1.5 to Ф11m, and the maximum depth can reach 48m. The furnace lining insulation of the vertical heating furnace for hot-loading roller sleeves of the present invention is insulated by high-purity ceramic fiber high-voltage modules. The heating element adopts widened 0Cr27Al7Mo2 resistance wire as the heating wire, which is designed for long life, has high heating efficiency, good insulation performance and can be continuously produced without breakage all year round. The vertical heating furnace for shrink-fitting roll sleeves is fully interlocked with the heating and mechanical operations. Power can only be connected when the furnace lid is closed. When the lid is opened, a limit switch immediately cuts off the control power to ensure safe operation. The vertical heating furnace for shrink-fitting roll sleeves is equipped with a high-precision process curve automatic temperature control cabinet, ensuring uniform upper and lower temperature zones. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1 It is a schematic diagram of the AA section; Figure 2 It is a schematic diagram of the BB section; Figure 3 for Figure 2 A top view of Figure 4 Schematic diagram of high-temperature nickel-chromium heating wire and ceramic fiber insulation material for bottom heating; Figure 5 for Figure 1 Partial view at center Ⅰ; Figure 6 for Figure 2 Partial view at center II; Figure 7 for Figure 2 Partial view at center III; Figure 8 for Figure 6 Schematic diagram of the middle DD section; Figure 9 This is a schematic diagram of the roller sleeve support base; Figure 10 This is a schematic diagram of the roller sleeve bottom support bracket; In the figure, 1. first ceramic fiber thermal insulation material; 2. second ceramic fiber thermal insulation material; 3. high-temperature insulating heat-resistant ceramic chassis; 4. high-temperature nickel-chromium electric heating wire for heating the bottom of the lower pit; 5. high-temperature clay refractory brick; 6. third ceramic fiber thermal insulation material; 7. high-temperature insulating heat-resistant ceramic tray with electric heating wire; 8. high-temperature nickel-chromium electric heating wire for circumferential heating of the lower pit; 9. roller sleeve support base; 10. first helical compression spring; 11. outer annular helical compression spring bracket; 12. roller sleeve bottom support bracket; 13. high-temperature nickel-chromium electric heating wire for heating the outer wall of the upper pit roller sleeve; 14. high-temperature clay refractory brick at the pit mouth; 15. hot-loading guide device support and heating furnace door opening and closing adjustment track; 16. high-temperature ceramic insulating sleeve; 17. roller sleeve thermal expansion measuring rod; 18. roller sleeve thermal expansion measuring scale; 19. roller sleeve Thermal expansion measurement pointer; 20. Display screen; 21. Thermocouple thermometer; 22. Second spiral compression spring; 23. Insulating spring bracket; 24. Fourth ceramic fiber thermal insulation material; 25. Fifth ceramic fiber thermal insulation material; 26. First-layer operating platform; 27. Outer support column of first-layer operating platform; 28. Middle support column of first and second-layer operating platforms; 29. Second-layer operating platform; 30. Inner support and wire threading hollow column of operating platform; 31. Third-layer operating platform; 32. Circumferential heating wire high-temperature insulating sleeve of lower pit; 33. Support column between third-layer operating platform and fourth-layer operating platform; 34. Fourth-layer operating platform; 35. Heating wire high-temperature insulating sleeve at the bottom of lower pit; 36. Thermocouple thermometer at the bottom of roller sleeve; 37. Inner annular spiral compression spring bracket. DETAILED DESCRIPTION

[0021] The following will clearly and completely describe the technical solutions in the embodiments of the present invention in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all the embodiments. All other embodiments obtained by ordinary technicians in this field based on the embodiments of the present invention without making creative work shall fall within the scope of protection of the present invention.

[0022] In the description of the present invention, it should be noted that the terms "upper," "lower," "inner," "outer," "top / bottom," and the like, indicating orientations or positional relationships, are based on the orientations or positional relationships shown in the accompanying drawings and are intended solely to facilitate and simplify the description of the present invention. They are not intended to indicate or imply that the devices or components referred to must have, be constructed, or operate in a specific orientation, and therefore should not be construed as limitations on the present invention. Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance.

[0023] In the description of the present invention, it should be noted that, unless otherwise expressly specified or limited, the terms "installed," "provided with," "mounted / connected," and "connected" should be understood in a broad sense. For example, "connected" can mean a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium, and it can be internal communication between two components. Those skilled in the art will understand the specific meanings of the above terms in the present invention based on specific circumstances.

[0024] like Figure 1-10 As shown, the present invention provides a vertical heating furnace for hot-loading of pit-type roller sleeves, comprising: The furnace body consists of a lower pit and an upper pit. The structure of the furnace body is similar to that of a standard box-type furnace. The outer shell is welded from A3 steel plates and section steel and then placed inside the furnace pit.

[0025] The furnace cover is used to cover the furnace body for heat preservation. It is welded from steel sections and steel plates. The furnace cover lining adopts a full fiber structure, which has good heat preservation performance and light weight.

[0026] The furnace lining, installed within the furnace body, is used for heat storage. It features an internal heating system and is assembled from fiber panels to form a single, all-fiber lining structure. The fiber lining is manufactured with a compression ratio of ≥45-50%, and a certain amount of compression is allowed during the manufacturing process to ensure that each ceramic module expands in different directions after assembly, forming a seamless, integrated structure that achieves optimal heat storage. Furthermore, this product is quick and easy to install and can be directly fixed to the stainless steel anchors of the furnace shell steel plate.

[0027] Measurement and control system, used to measure the temperature and expansion of the outer surface of the roller sleeve and perform control according to the temperature and expansion; At least one operating platform is used for operators to observe and operate. It is located in layers on the side wall of the pit to provide maintenance, monitoring, and operation space. The multi-layer design can adapt to detection needs at different heights (such as temperature measurement and reading expansion values).

[0028] The roller sleeve supporting base 9 is arranged between the lower pit and the upper pit, and is used to bear the weight of the roller sleeve. It is linked with the outer annular spiral compression spring bracket 11 described below to buffer thermal expansion stress.

[0029] The roller sleeve bottom support bracket 12 is arranged on the roller sleeve support base 9, located directly below the roller sleeve, directly in contact with the roller sleeve, and conducts heat. A heat circulation vent is set at the connection with the roller sleeve support base 9 to force air convection between the inner and outer surfaces, so that the temperature inside and outside the roller sleeve is synchronized, reducing thermal stress.

[0030] The first helical compression springs 10 are installed in 12 evenly distributed inner holes on the bottom support bracket 12 of the roller sleeve. Preferably, there are 12 first helical compression springs 10. The upper ends of the 12 first helical compression springs 10 support the outer annular helical compression spring bracket 11, and the upper ends of the other 12 first helical compression springs 10 support the inner annular helical compression spring bracket 37 (the thermocouple temperature meter 36 at the bottom of the roller sleeve is installed on the inner annular helical compression spring bracket 37). The main functions are: (1) combined with the conical structure designed for the bottom support bracket 12, the position of the bottom of the roller sleeve can be adaptively adjusted to ensure the verticality of the axis of the roller sleeve; (2) the air flow space can be increased; (3) the lifting force applied by the spring to the bottom of the roller sleeve is conducive to reducing the contact stress and deformation at the contact position between the corners of the roller sleeve and the support frame, thereby avoiding affecting the quality of the roller sleeve. The outer annular helical compression spring bracket 11 can fix the spring position to ensure the stability of the elastic support system.

[0031] like Figure 5 、 Figure 9 and Figure 10 As shown, axial and radial heat circulation vents are provided between the roller sleeve support base 9 and the roller sleeve bottom support bracket 12. The axial vents are 24 evenly spaced cylindrical holes located on the support bracket 9 and the support base 12, while the radial vents are 8 evenly spaced annular grooves located on the conical surface of the support bracket 12.

[0032] The lower pit and the upper pit are respectively provided with a lower pit heating system and an upper pit heating system for heating the roller sleeve.

[0033] The present invention adopts a rear exhaust method to exhaust smoke. A smoke outlet is opened at the rear of the furnace body, which is conducive to the pipeline entering the main smoke duct of the workshop. Air heat exchangers are set in the front and rear smoke exhaust ducts to recover the waste heat in the high-temperature smoke and heat the combustion air to about 250°C, which is more conducive to production operations.

[0034] In the present invention, the lower pit heating system includes: The first ceramic fiber insulation material 1, preferably 1260 standard ceramic fiber insulation (1260 standard aluminum silicate fiber insulation), is placed at the bottom of the pit, providing basic insulation and reducing heat loss. Combined with the second ceramic fiber insulation material 2 described below, it achieves layered insulation, balancing cost and performance.

[0035] The second ceramic fiber insulation material 2 is laid above the ceramic fiber insulation material, preferably arranged at the bottom of the furnace, preferably 1400 high-aluminum ceramic fiber insulation material (1400 high-aluminum aluminum silicate ceramic fiber cotton), which withstands high temperature loads and prevents heat leakage from the bottom. It cooperates with the following high-temperature insulating and heat-resistant ceramic chassis 3 to enhance the thermal stability of the bottom.

[0036] The high-temperature insulating heat-resistant ceramic chassis 3 is arranged above the high-aluminum ceramic fiber insulation material to provide insulation and heat insulation to prevent the heating wire from contacting and short-circuiting with the metal shell.

[0037] The high-temperature nickel-chromium heating wire 4 for heating the bottom of the lower pit is circumferentially arranged near the high-temperature insulating and heat-resistant ceramic chassis 3 to heat the inner wall of the roller sleeve. It is used in conjunction with the high-temperature nickel-chromium heating wire 8 for circumferential heating of the lower pit described below to achieve dual-zone temperature control and ensure uniform heating inside and outside.

[0038] High temperature clay refractory bricks 5 are circumferentially arranged around the high temperature nickel-chromium heating wire 4 for heating the bottom of the lower pit, locally enhancing the refractory performance, complementing the lining of the fiber furnace lining, and extending the life of the furnace body.

[0039] The third ceramic fiber thermal insulation material 6 is circumferentially arranged in the high temperature insulating heat-resistant ceramic chassis 3 to form a gradient insulation layer with the ceramic fiber thermal insulation material. The lower pit is circumferentially heated by a high-temperature nickel-chromium heating wire 8, which is circumferentially arranged on the side wall of the lower pit to heat the outer wall of the roller sleeve. The temperature is independently controlled in each zone to adapt to roller sleeves of different specifications.

[0040] The high-temperature insulating heat-resistant ceramic tray 7 of the heating wire is arranged in the lower pit to circumferentially heat the high-temperature nickel-chromium heating wire 8 to prevent the heating wire from shifting or grounding failure.

[0041] In the present invention, a high-temperature insulating sleeve 35 for the heating wire at the bottom of the pit is provided at the bottom of the pit, which is used to wrap the high-temperature nickel-chromium heating wire 4 used for heating the bottom of the pit, provide insulation protection, prevent short circuit, and ensure long-term stable operation of the heating wire.

[0042] The side wall of the lower pit is provided with a high-temperature insulating sleeve 32 for the circumferential heating wire of the lower pit, which is used to wrap the high-temperature nickel-chromium heating wire 8 for circumferential heating of the lower pit, provide insulation protection, prevent short circuit, and ensure long-term stable operation of the heating wire.

[0043] In the present invention, the upper pit heating system includes: The outer wall of the upper pit roller sleeve is heated by a high-temperature nickel-chromium heating wire 13, which is circumferentially arranged on the side wall of the upper pit and is used to heat the upper outer wall of the roller sleeve to form a three-dimensional heating network and eliminate temperature gradients.

[0044] A fourth ceramic fiber insulation material 24 (preferably 1260 standard ceramic fiber insulation material) and a fifth ceramic fiber insulation material 25 (preferably 1400 high-aluminum ceramic fiber insulation material) are circumferentially arranged around the sidewalls of the upper pit, outside the high-temperature nickel-chromium heating wire 13 used to heat the outer wall of the upper pit roller sleeve. This reduces the temperature of the operating platform area and ensures personnel safety. The combined effects of these two materials enhance local heat resistance.

[0045] The pit mouth high temperature clay refractory bricks 14 are arranged around the edge of the furnace mouth to resist the erosion of high temperature airflow, protect the fragile fiber material, and reduce damage to the furnace mouth.

[0046] In the present invention, the measurement and control system includes: The high-temperature ceramic insulating sleeve 16 passes through the side wall of the upper pit to protect the roller sleeve thermal expansion measuring rod 17 and the thermocouple temperature meter 21 of the wire harness, ensuring that the sensor works accurately at high temperatures.

[0047] The roller sleeve thermal expansion measuring rod 17 has one end passing through the high-temperature ceramic insulating sleeve 16 and contacts the outer wall of the roller sleeve. It is used to measure the change of the roller sleeve diameter in real time and forms a mechanical expansion monitoring system with the roller sleeve thermal expansion measuring scale 18 and roller sleeve thermal expansion measuring pointer 19 described below.

[0048] The roller sleeve thermal expansion measuring scale 18 is arranged near the other end of the roller sleeve thermal expansion measuring rod 17, and is provided with a digital scale to display the expansion scale, so that workers can directly read the data.

[0049] The roller sleeve thermal expansion measuring pointer 19 has one end connected to the other end of the roller sleeve thermal expansion measuring rod 17, and the other end is used to indicate the scale on the roller sleeve thermal expansion measuring scale 18, so as to amplify and indicate the expansion value and improve the reading accuracy.

[0050] One end of the thermocouple thermometer 21 passes through the high-temperature ceramic insulating sleeve 16 and is used to measure the temperature of the outer surface of the roller sleeve, and is linked to the control system or automatic control cabinet in the display screen 20 to achieve precise process adjustment.

[0051] The display screen 20 is connected to the other end of the thermocouple thermometer 21 and is used to display the temperature of the outer surface of the roller sleeve in real time. The digital display of temperature data replaces manual close-range reading to ensure safety.

[0052] The display screen 20 is provided with a control element for controlling at least the lower pit heating system and the upper pit heating system, for example, controlling the heating temperature of the lower pit heating system and the upper pit heating system.

[0053] In the present invention, the thermocouple thermometer 21 is reset by the second helical compression spring 22 and the insulating spring bracket 23 .

[0054] In the present invention, the operating platform has four layers, namely: a first layer operating platform 26 , a second layer operating platform 29 , a third layer operating platform 31 and a fourth layer operating platform 34 .

[0055] In the present invention, the operating platform is fixed by supporting columns and hollow columns.

[0056] For example, the fourth- and third-level operating platforms are fixedly connected to support columns 33 between the third and fourth-level operating platforms. The first-, second-, and third-level operating platforms are respectively fixedly connected to the first-level operating platform's outer support columns 27 and the first- and second-level operating platform's intermediate support columns 28. After the first, second, third, and fourth-level operating platforms are secured by these support columns, their other ends are fixedly connected to hollow support columns 30 located near the sidewalls of the heating furnace. These hollow support columns 30 serve as the wiring for components in the upper and lower pit heating systems, as well as the expansion and measurement control systems.

[0057] The present invention also includes: The shrink-fit guide device supports and the heating furnace door opening and closing adjustment track 15 are used to guide the insertion of the roller sleeve and roller shaft and adjust the opening and closing degree of the furnace door, respectively, to ensure that the roller sleeve and roller shaft are accurately docked and reduce the risk of collision.

[0058] The working method of the present invention is as follows: When large metallurgical roll sleeves and roll shafts need to be hot-fitted, the sleeves are first placed in the upper pit of the heating furnace. At this time, the bottom of the sleeves will contact the outer annular helical compression spring bracket 11, thereby fixing the sleeves. When the roller sleeve position is determined, the outer wall of the upper pit roller sleeve is heated by the high-temperature nickel-chromium heating wire 13, and the inner wall of the roller sleeve is heated by the high-temperature nickel-chromium heating wire 4 through the bottom of the lower pit; A heat circulation vent is provided at the connection between the roller sleeve bottom support bracket 12 and the roller sleeve support base 9, which can ensure forced convection heat circulation on the inner and outer surfaces of the roller sleeve during heating, ensuring that the temperature changes of the inner and outer surfaces of the large roller sleeve during heating are as uniform as possible; The roller sleeve thermal expansion measuring rod 17, the roller sleeve thermal expansion measuring scale 18, and the roller sleeve thermal expansion measuring pointer 19 measure the diameter of the roller sleeve outer wall; Thermocouple thermometer 21 measures the temperature of the outer surface of the roller sleeve, and the measured data is displayed in real time through the temperature display screen 20. The worker will observe and control the size on the first operating platform; After heating for a certain period of time, it can be measured that the size of the roller sleeve meets the requirements of hot-loading. At this time, the roller is placed vertically into the roller sleeve to complete the hot-loading process.

[0059] The above description is merely a preferred embodiment of the present invention. However, the scope of protection of the present invention is not limited thereto; any person skilled in the art who, within the technical scope disclosed by the present invention, makes equivalent substitutions or modifications based on the technical solutions and improved concepts of the present invention shall be covered by the scope of protection of the present invention.

Claims

1. A vertical heating furnace for hot-loading of pit-type roller sleeves, characterized in that: include: The furnace body consists of a lower pit and an upper pit; A furnace cover, used to cover the furnace body for heat preservation; A furnace lining is provided in the furnace body and is used for heat storage; Measurement and control system, used to measure the temperature and expansion of the outer surface of the roller sleeve and perform control according to the temperature and expansion; At least one operating platform for operators to observe and operate; A roller sleeve supporting base is arranged between the lower pit and the upper pit; The roller sleeve bottom support bracket is arranged on the roller sleeve support base; a first helical compression spring, one end of which is arranged on the bottom support bracket of the roller sleeve, and the other end of which supports the outer annular helical compression spring bracket; A heat circulation vent is provided between the roller sleeve support base and the roller sleeve bottom support bracket; The lower pit and the upper pit are respectively provided with a lower pit heating system and an upper pit heating system for heating the roller sleeve.

2. The vertical heating furnace for hot-loading of pit-type roller sleeves according to claim 1, characterized in that: The lower pit heating system includes: a first ceramic fiber thermal insulation material, disposed at the bottom of the lower pit; a second ceramic fiber thermal insulation material, laid on top of the ceramic fiber thermal insulation material; A high-temperature insulating and heat-resistant ceramic chassis is arranged above the high-aluminum ceramic fiber insulation material; The bottom of the lower pit is heated by a high-temperature nickel-chromium electric heating wire, which is circumferentially arranged near the high-temperature insulating heat-resistant ceramic chassis to heat the inner wall of the roller sleeve; High-temperature clay refractory bricks are circumferentially arranged around the high-temperature nickel-chromium heating wire used for heating the bottom of the lower pit; The third ceramic fiber insulation material is circumferentially arranged in the high temperature insulating heat-resistant ceramic chassis The lower pit is circumferentially heated by a high-temperature nickel-chromium heating wire, which is circumferentially arranged on the side wall of the lower pit; The high-temperature insulating heat-resistant ceramic tray of the heating wire is arranged in the lower pit to circumferentially heat the high-temperature nickel-chromium heating wire.

3. The vertical heating furnace for hot-loading of pit-type roller sleeves according to claim 1, characterized in that: The bottom of the lower pit is provided with a high-temperature insulating sleeve for the electric heating wire at the bottom of the lower pit; The side wall of the lower pit is provided with a lower pit circumferential electric heating wire high-temperature insulation sleeve.

4. The vertical heating furnace for hot-loading of pit-type roller sleeves according to claim 1, characterized in that: The upper pit heating system includes: A high-temperature nickel-chromium heating wire is used to heat the outer wall of the upper pit roller sleeve, which is circumferentially arranged on the side wall of the upper pit and is used to heat the outer wall of the roller sleeve; The fourth ceramic fiber thermal insulation material and the fifth ceramic fiber thermal insulation material are circumferentially arranged on the side wall of the upper pit and are located outside the high-temperature nickel-chromium heating wire used for heating the outer wall of the upper pit roller sleeve; The pit mouth is surrounded by high-temperature clay refractory bricks and is installed around the edge of the furnace mouth.

5. The vertical heating furnace for hot-loading of pit-type roller sleeves according to claim 1, characterized in that: The measurement and control system comprises: A high-temperature ceramic insulating sleeve passes through the side wall of the upper pit; A roller sleeve thermal expansion measuring rod, one end of which passes through the high-temperature ceramic insulating sleeve and is used to measure the change in the roller sleeve diameter; A roller sleeve thermal expansion measuring scale is provided near the other end of the roller sleeve thermal expansion measuring rod and has a numerical scale; a roller sleeve thermal expansion measurement pointer, one end of which is connected to the other end of the roller sleeve thermal expansion measurement rod, and the other end of which is used to indicate the scale on the roller sleeve thermal expansion measurement scale; a thermocouple thermometer, one end of which passes through the high-temperature ceramic insulating sleeve and is used to measure the temperature of the outer surface of the roller sleeve; A display screen, connected to the other end of the thermocouple thermometer, for displaying the temperature of the outer surface of the roller sleeve in real time; The display screen is provided with a control element, which is at least used to control the lower pit heating system and the upper pit heating system.

6. The vertical heating furnace for hot-loading of pit-type roller sleeves according to claim 5, characterized in that: The second helical compression spring and the insulating spring bracket apply a pressing force to the thermocouple temperature measuring head, so that the thermocouple temperature measuring head is closely fitted to the outer surface of the roller sleeve.

7. The vertical heating furnace for shrink-fitting of pit-type roller sleeves according to claim 1, characterized in that: The operating platform has four layers, namely: a first layer operating platform, a second layer operating platform, a third layer operating platform and a fourth layer operating platform.

8. The vertical heating furnace for shrink-fitting of pit-type roller sleeves according to claim 7, characterized in that: The operating platform is fixed by supporting columns and hollow columns.

9. A vertical heating furnace for hot-charging roller sleeves in a pit according to any one of claims 1 to 8, characterized in that: Also includes: The shrink-fit guide device support and the heating furnace door opening and closing adjustment track are used to guide the insertion of the roller sleeve and roller shaft and adjust the opening and closing degree of the furnace door respectively.

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