High-chrome steel roll for middle plate with high wear resistance

Abstract

The utility model relates to the field of high chromium steel roll, specifically provide a high wear resistance's medium plate high chromium steel roll, the utility model discloses the roll includes work part, extension, axle rod, the extension is located the both ends of work part, avoids the interference that causes with the roll working state, the outside of extension is provided with cooling mechanism, the utility model provides a high wear resistance's medium plate high chromium steel roll, through cooling mechanism, the detachable cooling jacket of extension outside both ends of roll work part is installed, and the cooling jacket part is immersed in the container that contains cooling medium, and this structure avoids the complex water channel in the roll internal processing, significantly reduces the manufacturing cost and process difficulty, and the heat is conducted from work part to extension, and then is transferred to medium through the cooling jacket of high thermal conductivity, realizes high -efficient heat dissipation, and simultaneously, the scheme adopts the closed cooling mode, and the pollution of traditional spraying to the rolled material and environment is eliminated.

Description

Technical Field

[0001] This utility model relates to the field of high-chromium steel rolls, and more particularly to a medium plate high-chromium steel roll with high wear resistance. Background Technology

[0002] Medium plate high chromium steel rolls are high-performance rolls manufactured using centrifugal composite casting technology. Their outer layer typically contains 8%-15% chromium. Due to the high-hardness M7C3 type carbides and tough martensitic matrix formed in the outer layer of the roll body, these rolls have extremely high wear resistance and excellent resistance to hot cracking. They are particularly suitable for harsh working conditions such as roughing and finishing mill stands in medium and heavy plate rolling mills.

[0003] The inventors of this application have discovered the following problems during practical use:

[0004] Currently, high-chromium steel rolls accumulate a large amount of heat during use. Current solutions often involve creating water channels inside the roll body and installing an outer shell to dissipate the heat through water circulation, or directly installing a spray system on the outside of the roll body. For example, CN219745845U discloses "a roll with internal cooling effect." However, traditional internal cooling methods place extremely high demands on the roll body's manufacturing process, resulting in high production costs. Therefore, the inventors urgently need to design a cooling mechanism that achieves both high cooling efficiency and avoids the environmental pollution caused by traditional spraying, thereby reducing roll costs and improving ease of use.

[0005] Therefore, it is necessary to provide a high wear-resistant medium plate high-chromium steel roll to solve the above-mentioned technical problems. Utility Model Content

[0006] The technical problem to be solved by this utility model is to provide a high wear-resistant medium plate high chromium steel roll, which addresses the above-mentioned defects of the prior art.

[0007] To achieve the above objectives, the technical solution of this utility model is: a high wear-resistant medium plate high chromium steel roll, the roll including a working part, an extension part, and a shaft, the extension part being located at both ends of the working part to avoid interference with the working state of the roll, and a cooling mechanism being provided on the outer side of the extension part;

[0008] The cooling mechanism includes a cooling sleeve, which is sleeved on the outside of the extension. One side of the cooling sleeve is detachably connected to the extension via an installation mechanism. The cooling sleeve is made of a metal with high thermal conductivity. A container for holding the cooling medium is provided below the outside of the cooling sleeve, and part of the cooling sleeve is placed inside the container.

[0009] By adopting the above technical solution, a highly efficient heat transfer path is constructed by fitting a cooling jacket made of highly thermally conductive metal on the outside of the extension at both ends of the working section and partially immersing it in a container filled with cooling medium: the heat generated by the working section of the roll is conducted to the cooling jacket through the extension and then transferred to the cooling medium in the container by the cooling jacket, thereby achieving continuous cooling of the roll. This eliminates the traditional method of processing complex cooling water channels inside the roll body, significantly reduces the manufacturing process difficulty and production cost of the roll itself, and avoids the pollution of the working environment and rolled material by open spraying.

[0010] Furthermore, the container has an inlet and an outlet on one side, and is connected to an external cooling medium circulation system via pipelines and a pump body.

[0011] By adopting the above technical solution, the cooling medium flows continuously under the drive of the pump, which can quickly remove the heat absorbed by the surface of the cooling jacket and dissipate heat efficiently through the external heat exchanger. This ensures that there is always a cooling medium with a lower temperature in contact with the cooling jacket, thereby maintaining a stable and efficient heat exchange efficiency. It avoids the problem of a sharp drop in cooling capacity caused by the cooling medium in the static pool becoming saturated with heat absorption. It is particularly suitable for long-term, high-load continuous rolling production.

[0012] Furthermore, the roll also includes a shaft, which is connected to an external drive device. The outer surface of the extension has an inclined structure, and the extension as a whole has a conical structure. The cooling jacket abuts against the inclined surface of the extension.

[0013] By adopting the above technical solution, the conical fit can generate a self-tightening effect. When the roll rotates at high speed, under the action of centrifugal force, the fit between the cooling jacket and the extension becomes tighter, effectively reducing the contact thermal resistance and ensuring that heat can be efficiently and evenly transferred from the extension to the cooling jacket, greatly improving the stability of cooling efficiency. At the same time, the conical structure plays a good positioning role, which facilitates the quick and accurate installation of the cooling jacket, ensures its concentricity with the roll, reduces vibration or uneven force caused by installation deviation, and improves the stability and reliability of equipment operation.

[0014] Furthermore, the upper end of the container is an open structure, used to accommodate the cooling jacket and to collect the cooling medium adhering to the surface of the cooling jacket.

[0015] By adopting the above technical solution, the effective part of the cooling jacket is submerged, ensuring that there is a sufficiently large heat exchange area in direct contact with the cooling medium, thereby guaranteeing the basic cooling capacity. At the same time, the open design greatly facilitates the installation, commissioning, and daily observation and maintenance of the cooling jacket, allowing operators to intuitively check the immersion depth of the cooling jacket and the cleanliness of the medium.

[0016] In a further configuration, the mounting mechanism includes a fastening ring and a flange. The flange is assembled and connected to one side of the extension. An installation ring is fixedly provided on the inner side of the fastening ring. The fastening ring is bolted to the extension via the installation ring, the flange, and the extension.

[0017] By adopting the above technical solution, the fastening ring, mounting ring and flange are pressed onto the extension by bolts, which can generate huge preload force. This ensures that the cooling jacket remains in close contact with the extension under the conditions of high-speed rotation and vibration of the rolls, and will not loosen or shift, thus ensuring the stability of heat transfer and the safety of the equipment.

[0018] In a further configuration, the flange is detachably connected to the rolls via bolts.

[0019] By adopting the above technical solution, the entire cooling mechanism can be designed and manufactured as a complete and independent module, achieving complete decoupling from the roll body. This modularity greatly simplifies the structure of the roll body, and the roll only needs to provide a standard connection interface, which is conducive to the standardized production and cost control of the roll.

[0020] In a further provision, a washer ring is attached to the side of the fastening ring near the cooling sleeve. The washer ring is a rigid washer and abuts against the cooling sleeve.

[0021] By adopting the above technical solution, a rigid gasket is added between the fastening ring and the cooling sleeve. This is crucial for ensuring connection reliability and sealing. The core function of the gasket is to transmit the tightening force generated by the bolt to the end face of the cooling sleeve more evenly and gently, avoiding stress concentration and preventing excessive local pressure from damaging the precision mating surface of the cooling sleeve, thereby protecting the integrity of the cooling sleeve and extending its service life.

[0022] Compared with related technologies, the high wear-resistant high-chromium steel roll for medium plates provided by this utility model has the following beneficial effects:

[0023] This invention provides a high-wear-resistant medium plate high-chromium steel roll. Through a cooling mechanism, detachable cooling jackets are installed on the outer side of the extensions at both ends of the working section of the roll. The cooling jackets are partially immersed in a container containing a cooling medium. This structure avoids the need to process complex water channels inside the roll, significantly reducing manufacturing costs and process difficulty. Heat is conducted from the working section to the extensions, and then transferred to the medium through the highly thermally conductive cooling jackets, achieving efficient heat dissipation. At the same time, this solution adopts a closed cooling method, eliminating the pollution of the rolled material and the environment caused by traditional spraying.

[0024] This invention provides a high wear-resistant medium plate high chromium steel roll, which adopts modular assembly. The cooling mechanism is connected to the roll body through components such as flanges and fastening rings to form an independent module. This structure makes the cooling jacket easy to disassemble and assemble, convenient for maintenance and replacement, and can be pre-assembled and tested as an independent module. Attached Figure Description

[0025] Figure 1 This is a three-dimensional structural diagram of the present invention;

[0026] Figure 2 This is a schematic diagram of the main structure of this utility model;

[0027] Figure 3 This is a cross-sectional structural diagram of the present invention;

[0028] Figure 4 This utility model Figure 3 A magnified structural diagram of point A in the middle.

[0029] The following are the labels in the diagram: 1. Roll; 101. Working section; 102. Extension section; 103. Shaft; 2. Cooling mechanism; 201. Cooling jacket; 202. Flange; 203. Fastening ring; 204. Mounting ring; 205. Gasket ring; 206. Container. Detailed Implementation

[0030] To facilitate understanding of this utility model, a more comprehensive description will be provided below with reference to the accompanying drawings. The drawings show typical embodiments of this utility model.

[0031] In this embodiment:

[0032] like Figure 1-4 As shown, this utility model discloses a high wear-resistant medium plate high chromium steel roll. The roll 1 includes a working part 101, an extension part 102, and a shaft 103. The extension part 102 is located at both ends of the working part 101 to avoid interference with the working state of the roll. A cooling mechanism 2 is provided on the outer side of the extension part 102.

[0033] The cooling mechanism 2 includes a cooling sleeve 201, which is fitted onto the outside of the extension 102. One side of the cooling sleeve 201 is detachably connected to the extension 102 via an installation mechanism. The cooling sleeve 201 is made of a highly thermally conductive metal. A container 206 for holding the cooling medium is provided below the outside of the cooling sleeve 201. Part of the cooling sleeve 201 is placed inside the container 206. By fitting the highly thermally conductive metal cooling sleeve 201 onto the outside of the extension 102 at both ends of the working part 101 and partially immersing it in the container 206 containing the cooling medium, an efficient heat transfer path is constructed: the heat generated by the working part 101 of the roll is conducted to the cooling sleeve 201 via the extension 102, and then transferred from the cooling sleeve 201 to the container 206. The cooling medium continuously cools the roll 1, eliminating the traditional method of machining complex cooling channels inside the roll body. This significantly reduces the manufacturing difficulty and production cost of the roll itself, while avoiding the pollution of the working environment and rolled material caused by open spraying. In addition, the solution modularizes the cooling function, and the cooling mechanism 2 is detachably connected to the roll body, so that components such as the cooling jacket 201 and container 206 can be manufactured, maintained and replaced independently. This not only facilitates daily cleaning and maintenance, but more importantly, when the cooling mechanism 2 is damaged or the working part 101 of the roll is worn to the limit, only a single module can be replaced, which greatly improves maintenance efficiency, reduces the total life cycle cost, and achieves a good balance between cooling effect and economy.

[0034] like Figure 1 As shown, container 206 has an inlet and an outlet on one side, and is connected to an external cooling medium circulation system through pipelines and a pump. The cooling medium flows continuously under the drive of the pump, which can quickly remove the heat absorbed by the surface of cooling jacket 201 and dissipate it efficiently through an external heat exchanger. This ensures that there is always a cool medium with a low temperature in contact with cooling jacket 201, thereby maintaining a stable and efficient heat exchange efficiency. This avoids the problem of a sharp drop in cooling capacity caused by the cooling medium in the static pool becoming saturated due to heat absorption. It is particularly suitable for long-term, high-load continuous rolling production. At the same time, this closed-loop circulation system realizes the recovery and reuse of the cooling medium, further improving environmental protection and economy. In addition, it allows for precise control of the flow rate and temperature of the coolant, thereby enabling more precise adjustment of the cooling intensity of roll 1. This is beneficial for optimizing the temperature control of the roll, improving the plate shape quality, and providing a reliable process guarantee for the production of high-quality medium and heavy plates.

[0035] like Figure 1 , Figure 2As shown, the roll 1 also includes a shaft 103, which is connected to an external drive device. The outer surface of the extension 102 has an inclined structure, and the extension 102 as a whole has a conical structure. The cooling sleeve 201 abuts against the inclined surface of the extension 102. The conical fit can generate a self-tightening effect. When the roll 1 rotates at high speed, under the action of centrifugal force, the fit between the cooling sleeve 201 and the extension 102 becomes tighter, effectively reducing the contact thermal resistance and ensuring that heat can be efficiently and evenly transferred from the extension 102 to the cooling sleeve 201, greatly improving the cooling efficiency. In addition to stability, the conical structure provides excellent positioning, facilitating the quick and accurate installation of the cooling jacket 201, ensuring its concentricity with the roll 1, reducing vibration or uneven stress caused by installation deviations, and improving the stability and reliability of equipment operation. Furthermore, the transmission connection between the shaft 103 and the external drive equipment is the foundation for the roll to achieve its rolling function. The clear division between the conical extension 102, the working part 101, and the transmission part makes the overall structure more reasonable, the force flow transmission smoother, and helps to reduce stress concentration and extend the service life of the roll 1 and its support bearings.

[0036] like Figure 1 , Figure 2 As shown, the upper end of container 206 is an open structure, used to accommodate cooling jacket 201 and collect cooling medium adhering to the surface of cooling jacket 201. This achieves effective partial immersion of cooling jacket 201, ensuring a sufficiently large heat exchange area for direct contact with the cooling medium, thereby guaranteeing the cooling capacity of the foundation. At the same time, the open design greatly facilitates the installation, commissioning, and daily observation and maintenance of cooling jacket 201. Operators can intuitively check the immersion depth of cooling jacket 201 and the cleanliness of the medium. More importantly, this open structure, as an efficient collection device, effectively prevents the medium from splashing onto the mill foundation or the surface of the rolled material, avoiding pollution of the working environment, reducing medium waste, and eliminating safety hazards caused by slippery ground. It truly realizes the cleanliness and intensification of the cooling process, meeting the requirements of modern green manufacturing.

[0037] like Figure 4As shown, the mounting mechanism includes a fastening ring 203 and a flange 202. The flange 202 is assembled and connected to one side of the extension 102. An installation ring 204 is fixedly installed on the inner side of the fastening ring 203. The fastening ring 203 and the extension 102 are connected by bolts in a detachable manner through the installation ring 204 and the flange 202. The fastening ring 203, the installation ring 204 and the flange 202 are pressed onto the extension 102 by bolts, which can generate a huge pre-tightening force to ensure that the cooling jacket 201 remains in close contact with the extension 102 under the conditions of high-speed rotation and vibration of the roll 1, without loosening or displacement, thus ensuring the stability of heat transfer and the safety of the equipment. At the same time, separating the cooling mechanism 2 from the roll 1 body allows components such as the cooling jacket 201 and the fastening ring 203 to be pre-assembled and maintained offline as an independent assembly. When it is necessary to replace the roll or repair the cooling mechanism 2, disassembly and assembly can be completed quickly by simply loosening and tightening the bolts, which greatly shortens the downtime and improves the operating rate of the production line.

[0038] like Figure 4 As shown, flange 202 is detachably connected to roll 1 by bolts, allowing the entire cooling mechanism 2 to be designed and manufactured as a complete and independent module, achieving complete decoupling from the roll 1 body. This modular design greatly simplifies the structure of the roll 1 body, requiring only a standard connection interface, which is beneficial for standardized production and cost control of roll 1. At the same time, the split design provides great flexibility for maintenance operations. When the cooling mechanism 2 needs major repairs or upgrades, it can be completely removed from roll 1 without affecting other settings of roll 1 in the machine position.

[0039] like Figure 4 As shown, a washer ring 205 is attached to the side of the fastening ring 203 near the cooling sleeve 201. The washer ring 205 is a rigid washer and abuts against the cooling sleeve 201. The addition of the rigid washer ring 205 between the fastening ring 203 and the cooling sleeve 201 is crucial for ensuring connection reliability and sealing. The core function of the washer ring 205 is to transmit the tightening force generated by the bolts more evenly and gently to the end face of the cooling sleeve 201, avoiding stress concentration and preventing excessive local pressure from damaging the precision mating surface of the cooling sleeve 201. This protects the integrity of the cooling sleeve 201 and extends its service life. At the same time, as a rigid washer, the washer ring 205 itself is not easily deformed and can provide a stable and uniform support plane, ensuring that the cooling sleeve 201 is firmly locked in the axial direction. This effectively prevents fretting wear and loosening that may occur when the roll 1 starts or stops or changes in speed, and improves the stability of the entire cooling mechanism 2 under long-term dynamic load.

[0040] During implementation, the large amount of heat generated by the working part 101 of the roll 1 during rolling is conducted radially to the lower-temperature extensions 102 on both sides. The cooling mechanism 2 installed on the extension 102 is the key to heat dissipation: the highly thermally conductive cooling jacket 201 is tightly fitted on the outside of the tapered extension 102 through the mounting mechanism consisting of the fastening ring 203, the mounting ring 204 and the flange 202, ensuring good thermal contact. Heat is efficiently transferred from the extension 102 to the cooling jacket 201. The cooling jacket 201, which is partially immersed in the container 206 containing the cooling medium, continuously releases heat to the medium or air through its huge surface area. The open design at the top of the container 206 facilitates the immersion of the cooling jacket 201 and helps to collect the dripping medium. Finally, through the pipeline and pump body connected to the inlet and outlet of the container 206, the heated cooling medium can be cooled and reused in the external circulation system, thereby achieving continuous, efficient and clean cooling of the working part 101 of the roll 1.

[0041] The advantages of this technical solution in practical applications include, but are not limited to, the following:

[0042] 1. A detachable cooling jacket is installed on the outer side of the extension at both ends of the working section of the roll. The cooling jacket is partially immersed in a container containing a cooling medium. Heat is conducted from the working section to the extension and then transferred to the medium through the highly thermally conductive cooling jacket, thus achieving efficient heat dissipation.

[0043] 2. The cooling mechanism is connected to the roll body through components such as flanges and fastening rings, forming an independent module.

[0044] Although embodiments of the present invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the present invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. A high-wear-resistant medium plate high-chromium steel roll, characterized in that: The roll (1) includes a working part (101), an extension part (102), and a shaft (103). The extension part (102) is located at both ends of the working part (101) to avoid interference with the working state of the roll. A cooling mechanism (2) is provided on the outside of the extension part (102). The cooling mechanism (2) includes a cooling sleeve (201), which is sleeved on the outside of the extension (102). One side of the cooling sleeve (201) is detachably sleeved with the extension (102) through an installation mechanism. The cooling sleeve (201) is made of a metal with high thermal conductivity. A container (206) for holding the cooling medium is provided below the outside of the cooling sleeve (201), and part of the cooling sleeve (201) is placed inside the container (206).

2. The high wear-resistant high-chromium steel roll for medium plates according to claim 1, characterized in that, The container (206) has an inlet and an outlet on one side, and is connected to an external cooling medium circulation system through pipelines and a pump body.

3. A high-wear-resistant medium plate high-chromium steel roll according to claim 1, characterized in that, The roll (1) also includes a shaft (103), which is connected to an external drive device. The outer surface of the extension (102) is inclined, and the extension (102) is tapered. The cooling sleeve (201) abuts against the inclined surface of the extension (102).

4. A high-wear-resistant medium plate high-chromium steel roll according to claim 1, characterized in that, The upper end of the container (206) is an open structure, used to accommodate the cooling jacket (201) and to collect the cooling medium adhering to the surface of the cooling jacket (201).

5. A high-wear-resistant medium-plate high-chromium steel roll according to claim 1, characterized in that, The mounting mechanism includes a fastening ring (203) and a flange (202). The flange (202) is assembled and connected to one side of the extension (102). An installation ring (204) is fixedly provided on the inner side of the fastening ring (203). The fastening ring (203) is bolted and detachably connected to the extension (102) through the installation ring (204), the flange (202).

6. A high-wear-resistant medium-plate high-chromium steel roll according to claim 5, characterized in that, The flange (202) is detachably connected to the roll (1) by bolts.

7. A high-wear-resistant medium-plate high-chromium steel roll according to claim 5, characterized in that, A washer ring (205) is attached to the side of the fastening ring (203) near the cooling sleeve (201). The washer ring (205) is a rigid washer and abuts against the cooling sleeve (201).

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