Nickel-chromium-molybdenum chilled cast iron centrifugal composite roller
By adopting roller neck, positioning groove, protective sleeve and other structures in nickel-chromium molybdenum cold hard cast iron centrifugal composite rolls, the wear problem caused by friction between the roller neck and the bracket is solved, and more efficient use and maintenance is achieved, and production costs are reduced. .
Patent Information
- Application Number
- CN202420865017.2
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-04-24
- Publication Date
- 2024-12-17
- Estimated Expiration
- 2034-04-24
AI Technical Summary
During the rotation of the existing nickel-chromium molybdenum cold hard cast iron centrifugal composite rolls, friction between the roller neck and the bracket causes severe wear, increasing maintenance costs and reducing working efficiency.
A nickel-chromium molybdenum cold hard cast iron centrifugal composite roll was designed, adopting a combined structure of roll neck, positioning groove, protective sleeve, wear-resistant layer, heat-resistant layer and reinforcement ribs. Through the matching design of threaded holes and positioning card blocks, it is quickly Install and replace protective sleeves to reduce direct contact between the roller neck and the bracket, extend service life and improve working efficiency.
It effectively reduces the wear of the roller neck, reduces maintenance costs, extends the service life of the roller, improves work efficiency, and reduces the downtime in production.
Smart Images
Figure CN222175376U_ABST
Abstract
Description
Technical Field
[0001] The utility model belongs to the technical field of rollers, and more specifically, particularly relates to a nickel-chromium-molybdenum chilled cast iron centrifugal composite roller. Background Art
[0002] Chilled cast iron is also called "chilled cast iron". When making a casting mold, the parts of the casting surface that require wear resistance are made into metal molds with a faster cooling rate, and the rest of the parts are made into sand molds. By properly adjusting the chemical composition of the cast iron (such as reducing the silicon content), the casting can obtain white cast iron structure on the wear-resistant surface, and gray cast iron and mottled cast iron structure in the rest of the parts, so that the casting has both high hardness and wear resistance and good toughness. Rollers are tools that cause metal to undergo plastic deformation and are important consumables that determine the efficiency of the rolling mill and the quality of the rolled material. Rollers are important parts on the rolling mill of a steel mill. They use the pressure generated by a pair or a group of rollers when rolling to roll the steel. It mainly bears the influence of dynamic and static loads, wear and temperature changes during rolling.
[0003] Since some of the current nickel-chromium-molybdenum chilled cast iron centrifugal composite rolls are heavy, when installing the rolls, a bearing seat or bracket is usually installed directly below the roll neck to provide auxiliary support for the rolls. However, during the rotation of the rolls, the roll neck will frequently rub against the bracket, resulting in severe wear at the connection between the roll neck and the bracket. This requires workers to frequently maintain the roll neck before they can continue to use the rolls, which increases costs and reduces work efficiency.
[0004] Therefore, in view of this, the existing structure and defects are studied and improved, and a nickel-chromium-molybdenum chilled cast iron centrifugal composite roller is provided, in order to achieve a more practical purpose. Utility Model Content
[0005] In order to solve the above technical problems, the utility model provides a nickel-chromium-molybdenum chilled cast iron centrifugal composite roll, which is achieved by the following specific technical means:
[0006] A nickel-chromium-molybdenum chilled cast iron centrifugal composite rolling roller comprises a roller body, a pair of roller necks are symmetrically installed at both ends of the roller body, four positioning grooves are equidistantly provided on the opposite sides of the pair of roller necks, the bottom ends of the four positioning grooves are each provided with a first threaded hole, one side of the roller neck is provided with a protective sleeve, four positioning blocks are equidistantly installed on the inner side of the protective sleeve, the bottom ends of the four positioning blocks are each provided with a second threaded hole, and the second threaded hole passes through the protective sleeve, the surface of the protective sleeve is provided with a wear-resistant layer, the inside of the protective sleeve is provided with a heat-resistant layer, and a pair of roller necks are provided with roller heads on the opposite sides.
[0007] Furthermore, the position and size of the positioning block match the position and size of the positioning groove.
[0008] Furthermore, the position and size of the second threaded hole match the position and size of the first threaded hole.
[0009] Furthermore, the wear-resistant layer is made of nickel-chromium alloy.
[0010] Furthermore, the heat-resistant layer is made of ceramic fiber.
[0011] Furthermore, reinforcing ribs are provided inside the protective cover.
[0012] Furthermore, a pair of roller heads are provided with mounting holes on opposite sides.
[0013] Compared with the prior art, the utility model has the following beneficial effects:
[0014] The nickel-chromium-molybdenum chilled cast iron centrifugal composite roller in the utility model is used in conjunction with the roller neck, the positioning groove, the first threaded hole, the protective sleeve, the positioning block, the second threaded hole, the wear-resistant layer, the heat-resistant layer and the reinforcing ribs. It is convenient to quickly install the protective sleeve to the position where the roller neck is in direct contact with the bracket while installing the roller, and fix the protective sleeve with bolts so that the protective sleeve can protect the roller neck and reduce damage to the roller neck caused by direct contact between the roller neck and the bracket. After the protective sleeve has been used for a period of time, the protective sleeve can be quickly disassembled and replaced with a new protective sleeve, avoiding shutdowns due to the need to maintain the roller neck, thereby reducing production costs, extending the service life of the roller, and improving the working efficiency of the roller. BRIEF DESCRIPTION OF THE DRAWINGS
[0015] Figure 1 It is a three-dimensional schematic diagram of the utility model.
[0016] Figure 2 It is a three-dimensional explosion schematic diagram of the utility model.
[0017] Figure 3 It is a side cross-sectional schematic diagram of the internal structure of the roller neck of the utility model.
[0018] Figure 4 It is a side cross-sectional schematic diagram of the internal structure of the protective cover of the utility model.
[0019] Figure 5 It is a side cross-sectional schematic diagram of the wear-resistant layer, heat-resistant layer and reinforcing rib structure inside the protective cover of the utility model.
[0020] In the figure, the corresponding relationship between the component names and the figure numbers is as follows:
[0021] 1. Roller body; 2. Roller neck; 3. Positioning groove; 4. First threaded hole; 5. Protective cover; 6. Positioning block; 7. Second threaded hole; 8. Wear-resistant layer; 9. Heat-resistant layer; 10. Roller head; 11. Reinforcement rib; 12. Mounting hole. DETAILED DESCRIPTION
[0022] The following is a further detailed description of the implementation of the present utility model in conjunction with the accompanying drawings and examples. The following examples are used to illustrate the present utility model, but cannot be used to limit the scope of the present utility model.
[0023] In the description of the present invention, unless otherwise specified, "multiple" means two or more; the terms "upper", "lower", "left", "right", "inner", "outer", "front end", "rear end", "head", "tail" and the like indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings, which is only for the convenience of describing the present invention and simplifying the description, and does not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operate in a specific orientation, and therefore cannot be understood as limiting the present invention. In addition, the terms "first", "second", "third" and the like are only used for descriptive purposes and cannot be understood as indicating or implying relative importance.
[0024] In the description of the present invention, it should be noted that, unless otherwise clearly specified and limited, the terms "connected" and "connection" should be understood in a broad sense, for example, it can be 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. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.
[0025] Example:
[0026] As attached Figure 1 To Attachment Figure 5 As shown:
[0027] The utility model provides a nickel-chromium-molybdenum chilled cast iron centrifugal composite roller, comprising a roller body 1, a pair of roller necks 2 are symmetrically installed at both ends of the roller body 1, the pair of roller necks 2 are evenly provided with four positioning grooves 3 on the opposite sides, the bottom ends of the four positioning grooves 3 are each provided with a first threaded hole 4, one side of the roller neck 2 is sleeved with a protective sleeve 5, four positioning blocks 6 are evenly installed on the inner side of the protective sleeve 5, the bottom ends of the four positioning blocks 6 are each provided with a second threaded hole 7, and the second threaded hole 7 passes through the protective sleeve 5, the surface of the protective sleeve 5 is provided with a wear-resistant layer 8, the interior of the protective sleeve 5 is provided with a heat-resistant layer 9, and the pair of roller necks 2 are each provided with a roller head 10 on the opposite sides.
[0028] Among them, the position and size of the positioning block 6 match the position and size of the positioning groove 3. By inserting the positioning block 6 into the positioning groove 3, it is convenient for the staff to quickly install the protective cover 5 to one side of the roller neck 2, and when the protective cover 5 and the roller neck 2 are fixed together with bolts, the rotation and shaking of the protective cover 5 on the side around the roller neck 2 are reduced, thereby improving the work efficiency of the staff when installing the protective cover 5.
[0029] Among them, the position and size of the second threaded hole 7 match the position and size of the first threaded hole 4. After the staff inserts the positioning block 6 into the positioning groove 3, the bolt can be taken out and rotated to make the bolt pass through the second threaded hole 7 and enter the first threaded hole 4. When selecting the bolt, the staff can choose a bolt whose length is less than the sum of the length of the first threaded hole 4 and the length of the second threaded hole 7, so that the bolt can completely enter the first threaded hole 4 and fix the protective cover 5, and then can completely enter the second threaded hole 7, so as to avoid the nut part of the bolt being exposed to the outside of the second threaded hole 7 and affecting the rotation of the roller. When it is necessary to remove the protective cover 5, the bolt is unscrewed from the first threaded hole 4 and the second threaded hole 7 in turn, and then the protective cover 5 is pulled to disengage the positioning block 6 from the positioning groove 3, and the protective cover 5 can be removed.
[0030] Among them, the material of the wear-resistant layer 8 is nickel-chromium alloy, which usually has a higher hardness, so that it can better resist surface wear when subjected to friction and wear. Nickel-chromium alloy has good oxidation resistance in high temperature environment and is not easy to produce an oxide layer. Therefore, it can maintain relatively stable surface performance under high temperature and high-speed friction conditions, thereby extending the service life of the protective cover 5, reducing the frequency of replacement and maintenance of the protective cover 5, and reducing production costs.
[0031] Among them, the material of the heat-resistant layer 9 is ceramic fiber, which is usually composed of high-melting-point inorganic compounds such as oxides and silicates. These compounds have a melting point of up to thousands of degrees Celsius, so that the ceramic fiber still maintains stable chemical properties at high temperatures and is not easy to melt or deform. At the same time, the ceramic fiber has a low thermal conductivity and can effectively prevent the conduction of heat, thereby slowing down the heating rate of the material, so that it can maintain a relatively low surface temperature in a high-temperature environment, thereby protecting the internal structure of the protective cover 5, reducing the replacement and maintenance frequency of the protective cover 5, and reducing production costs.
[0032] Among them, the protective cover 5 is provided with reinforcing ribs 11 inside, which can effectively increase the tensile strength, yield strength and hardness of the metal. This is because the reinforcing ribs 11 can hinder dislocation slip and grain sliding, thereby making the deformation of the metal more difficult, improving its ability to resist deformation and fracture, and thus extending the service life of the protective cover 5.
[0033] A pair of roller heads 10 are provided with mounting holes 12 on opposite sides to facilitate mounting the rollers on the frame.
[0034] The working principle of this embodiment: when using the nickel-chromium-molybdenum chilled cast iron centrifugal composite roller, the staff first inserts the positioning block 6 into the positioning groove 3, then takes out and rotates the bolt so that the bolt passes through the second threaded hole 7 and enters the first threaded hole 4. When selecting the bolt, the staff can choose a bolt whose length is less than the sum of the length of the first threaded hole 4 and the length of the second threaded hole 7, so that the bolt can completely enter the first threaded hole 4 and fix the protective cover 5, and then can completely enter the second threaded hole 7, so as to avoid the nut part of the bolt being exposed to the outside of the second threaded hole 7 and affecting the rotation of the roller, and then install the roller on the frame through the mounting hole 12 and fix the roller, and then move the bracket to directly below the protective cover 5 so that the bracket contacts the protective cover 5, so that the protective cover 5 can be The roll neck 2 of the rolling mill is protected to prevent the bracket from directly contacting the roll neck 2 when the rolling mill rotates, causing wear of the roll neck 2. When the protective cover 5 needs to be replaced after being used for a period of time, the staff first detaches the side of the rolling mill that needs to replace the protective cover 5 from the frame, and then unscrews the bolts from the first threaded hole 4 and the second threaded hole 7 in turn, and finally pulls the protective cover 5 to disengage the positioning block 6 from the positioning groove 3, and the protective cover 5 can be removed. At this time, the rolling mill can continue to work after replacing the new protective cover 5, reducing the impact of replacing the protective cover 5 on the working efficiency of the rolling mill. The wear-resistant layer 8 on the surface of the protective cover 5 and the heat-resistant layer 9 and the reinforcing ribs 11 inside the protective cover 5 can extend the service life of the protective cover 5, reduce the replacement frequency of the protective cover 5, and reduce the production cost.
[0035] The embodiments of the present invention are provided for the purpose of illustration and description, and are not intended to be exhaustive or to limit the present invention to the disclosed forms. Many modifications and variations will be apparent to those of ordinary skill in the art. The embodiments are selected and described to better illustrate the principles and practical applications of the present invention, and to enable those of ordinary skill in the art to understand the present invention and thereby design various embodiments with various modifications suitable for specific purposes.
Claims
1. A nickel-chromium-molybdenum chilled cast iron centrifugal composite roll, comprising a roll body (1), characterized in that: A pair of roller necks (2) are symmetrically mounted at both ends of the roller body (1); four positioning grooves (3) are equidistantly mounted on opposite sides of the pair of roller necks (2); the bottom ends of the four positioning grooves (3) are each provided with a first threaded hole (4); a protective sleeve (5) is sleeved on one side of the roller neck (2); four positioning blocks (6) are equidistantly mounted on the inner side of the protective sleeve (5); the bottom ends of the four positioning blocks (6) are each provided with a second threaded hole (7); and the second threaded hole (7) passes through the protective sleeve (5); a wear-resistant layer (8) is disposed on the surface of the protective sleeve (5); a heat-resistant layer (9) is disposed inside the protective sleeve (5); and a roller head (10) is mounted on opposite sides of the pair of roller necks (2).
2. The nickel-chromium-molybdenum chilled cast iron centrifugal composite roll according to claim 1, characterized in that: The position and size of the positioning block (6) match the position and size of the positioning groove (3).
3. The nickel-chromium-molybdenum chilled cast iron centrifugal composite roll according to claim 1, characterized in that: The position and size of the second threaded hole (7) match the position and size of the first threaded hole (4).
4. The nickel-chromium-molybdenum chilled cast iron centrifugal composite roll according to claim 1, characterized in that: The material of the wear-resistant layer (8) is nickel-chromium alloy.
5. The nickel-chromium-molybdenum chilled cast iron centrifugal composite roll according to claim 1, characterized in that: The material of the heat-resistant layer (9) is ceramic fiber.
6. The nickel-chromium-molybdenum chilled cast iron centrifugal composite roll according to claim 1, characterized in that: The protective cover (5) is provided with reinforcing ribs (11) inside.
7. The nickel-chromium-molybdenum chilled cast iron centrifugal composite roll according to claim 1, characterized in that: The pair of roller heads (10) are both provided with mounting holes (12) on opposite sides.