Improved exit guide structure for a medium bar mill
By improving the exit guide structure of the bar mill, changing the contact between the guide and the guide beam from point contact to surface contact, the problem of head bending caused by uneven billet temperature was solved, thus improving product quality and production efficiency.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- BENGANG STEEL PLATES CO LTD
- Filing Date
- 2025-08-08
- Publication Date
- 2026-07-21
Smart Images
Figure CN224525613U_ABST
Abstract
Description
Technical Field
[0001] This utility model relates to the field of bar rolling mill technology, and more particularly to an improved exit guide structure for medium bar rolling mills. Background Technology
[0002] The bar production line of Benxi Steel's Special Steel Division was initially built in 2007 and upgraded in 2019. After the upgrade, it is mainly equipped with two walking beam furnaces, one Φ1150mm two-roll reversible billet mill, three 850mm high-rigidity rolling mills without arches, one hydraulic shear, four 480mm and five 576mm short-stress finishing mills, one marshalling yard, three grinding saws, and one rack-and-pinion walking beam cooling bed. It uses 390*480mm continuously cast billets as raw material and can roll round bars of Φ85~200mm and certain specifications of square and flat bars. It mainly produces bearing steel, gear steel, alloy structural steel, petroleum steel, and gas cylinder steel.
[0003] By benchmarking against leading domestic special steel enterprises, it was found that head bending of bar stock is a quality problem faced by domestic bar mills. The head bending length of steel is mostly in the range of 0.5-1.5m. Especially for special steel grades with Φ150-200mm, head bending is difficult to eliminate through straightening due to the blind zone of the pressure straightener. In order to ensure the straightness of the steel, the head bending can only be cut off in the finishing process. This not only affects the normal production order and process cost of finishing, but also increases the process cycle, increases metal consumption, and reduces the yield by 0.2-0.5%. It can be seen that head bending of bar stock has become an urgent problem to be solved in steel rolling production lines.
[0004] The improved exit guide structure used in traditional medium bar mills has the following defects. First, when using the improved exit guide structure used in traditional medium bar mills, because the heating furnace adopts the end-in and end-out loading and unloading method, the temperature is high on the side near the furnace and low on the roller table side during the steel tapping process, resulting in uneven temperature on the left and right sides of the billet. During the rolling process, the uneven temperature on each side of the billet leads to uneven rolling force and abnormal friction coefficient, causing the round bar to bend towards the side with lower temperature during the rolling process. Secondly, when using the improved exit guide structure for traditional medium bar mills, the sizing mill pass uses the finished product pass. However, due to the curvature of the finished product head, after sizing rolling, a single-sided impact ear appears at the head of the rolled piece, which not only fails to improve the head curvature but also causes surface defects.
[0005] Therefore, there is an urgent need for a new type of export guide structure that can effectively solve the problem of uneven temperature distribution in steel billets, improve the fixing strength of the guide, thereby eradicating the problem of steel head bending and improving product quality and production efficiency. Utility Model Content
[0006] To address the aforementioned technical problems, an improved exit guide structure for medium bar mills is provided. This invention enhances structural stability and eliminates rolling sway by changing the fixing method between the guide and the guide beam from point contact to surface contact, thereby solving the problems of steel head bending and surface defects.
[0007] To achieve the above objectives, this utility model provides an improved outlet guide structure for a medium bar mill, comprising a rectangular frame. An upper pressure plate is fixedly installed on one side of the rectangular frame, and an upper plate connecting screw is fixedly installed on the inner side of the upper pressure plate. One end of the upper plate connecting screw is engaged with a conical connecting column, one end of the conical connecting column is fixedly connected to a top plate, and one end of the top plate is fixedly connected to an outlet nose cone. A lower pressure plate is fixedly installed on the other side of the rectangular frame, and a lower plate connecting screw is fixedly installed on the inner side of the lower pressure plate. A connecting piece is fixedly installed on the inner side of the lower plate connecting screw, and a clamping block is fixedly connected to one side of the connecting piece. An outlet conduit is engaged with the inner side of the clamping block.
[0008] Furthermore, all four corners of one end of the rectangular frame are provided with smooth chamfers.
[0009] Furthermore, a plurality of frame connecting screws are fixedly provided on the inner side of the rectangular frame, and side guide plates are fixedly connected to all four sides of the rectangular frame.
[0010] Furthermore, a connection slot is provided on one side of the conical connecting post.
[0011] Furthermore, each of the four corners of the rectangular frame is fixedly provided with a crossbeam connecting block.
[0012] Furthermore, a corresponding fixing block is fixedly provided on one side of the outlet conduit.
[0013] Furthermore, the upper pressure plate changes the point contact between the guide and the guide beam to a surface contact. By adopting the above technical solution, this utility model has the following advantages compared with the prior art: 1. This utility model provides an improved exit guide structure for medium bar mills, which significantly reduces head bending during the rolling process by controlling the temperature difference between different surfaces of the billet. The bending ratio and bending degree per meter are effectively controlled, thus improving the straightness of the steel.
[0014] 2. The improved exit guide structure for medium bar mills provided by this utility model significantly improves the appearance quality of special steel, increases the overall yield, shortens the process cycle, reduces unplanned product inventory, and significantly shortens the delivery time. Attached Figure Description
[0015] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.
[0016] Figure 1 This is a schematic diagram of an improved outlet guide structure for a medium bar mill as described in this utility model; Figure 2 This is a left-side sectional view of an improved outlet guide structure for a medium bar mill as described in this utility model. Figure 3 This is a partial front view of the improved outlet guide structure for a medium bar mill according to the present invention. Figure 4 This is a three-dimensional structural diagram of an improved outlet guide structure and outlet nose cone for a medium bar mill, as described in this utility model. Figure 5 This is a three-dimensional structural diagram of an improved outlet guide structure for a medium bar mill, as described in this utility model.
[0017] In the diagram: 1. Rectangular frame; 2. Frame connecting screws; 3. Upper pressure plate; 4. Upper plate connecting screws; 5. Lower pressure plate; 6. Lower plate connecting screws; 7. Crossbeam connecting block; 8. Conical connecting column; 9. Connecting bayonet; 10. Top plate; 11. Outlet nose cone; 12. Connecting piece; 13. Clamping block; 14. Outlet conduit; 15. Corresponding fixing block; 16. Side guide plate; 17. Smooth chamfer. Detailed Implementation
[0018] It should be noted that, unless otherwise specified, the embodiments and features described in the present invention can be combined with each other. The present invention will now be described in detail with reference to the accompanying drawings and embodiments.
[0019] To make the objectives, technical solutions, and advantages of the embodiments of the present invention clearer, the technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. The following description of at least one exemplary embodiment is merely illustrative and is in no way intended to limit the present invention or its application or use. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.
[0020] 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 scope of exemplary embodiments according to the invention. 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.
[0021] Unless otherwise specifically stated, the relative arrangement, numerical expressions, and values of the components and steps described in these embodiments do not limit the scope of the invention. It should also be understood that, for ease of description, the dimensions of the various parts shown in the drawings are not drawn to actual scale. Techniques, methods, and devices known to those skilled in the art may not be discussed in detail, but where appropriate, such techniques, methods, and devices should be considered part of the specification. In all examples shown and discussed herein, any specific values should be interpreted as merely exemplary and not as limitations. Therefore, other examples of exemplary embodiments may have different values. It should be noted that similar reference numerals and letters in the following drawings denote similar items; therefore, once an item is defined in one drawing, it need not be further discussed in subsequent drawings.
[0022] In the description of this invention, it should be understood that the orientation or positional relationship indicated by directional terms such as "front, back, up, down, left, right", "horizontal, vertical, horizontal" and "top, bottom" is generally based on the orientation or positional relationship shown in the accompanying drawings, and is only for the convenience of describing this invention and simplifying the description. Unless otherwise stated, these directional terms do not indicate or imply that the device or element referred to must have a specific orientation or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation on the scope of protection of this invention. The directional terms "inner" and "outer" refer to the inner and outer contours relative to the outline of each component itself.
[0023] For ease of description, spatial relative terms such as "above," "on top of," "on the upper surface of," "above," etc., are used herein to describe the spatial positional relationship of a device or feature as shown in the figures to other devices or features. It should be understood that spatial relative terms are intended to encompass different orientations in use or operation besides the orientation of the device as described in the figures. For example, if the device in the figures is inverted, a device described as "above" or "on top of" other devices or structures would subsequently be positioned as "below" or "under" other devices or structures. Thus, the exemplary term "above" can include both "above" and "below." The device may also be positioned in other different ways (rotated 90 degrees or in other orientations), and the spatial relative descriptions used herein will be interpreted accordingly.
[0024] Furthermore, it should be noted that the use of terms such as "first" and "second" to define components is merely for the purpose of distinguishing the corresponding components. Unless otherwise stated, the above terms have no special meaning and therefore should not be construed as limiting the scope of protection of this invention.
[0025] like Figures 1 to 5 As shown, this utility model provides an improved outlet guide structure for a medium bar mill, including a rectangular frame 1. An upper pressure plate 3 is fixedly installed on one side of the rectangular frame 1. An upper plate connecting screw 4 is fixedly installed on the inner side of the upper pressure plate 3. One end of the upper plate connecting screw 4 is engaged with a conical connecting column 8. One end of the conical connecting column 8 is fixedly connected with a top plate 10. One end of the top plate 10 is fixedly connected with an outlet nose cone 11. A lower pressure plate 5 is fixedly installed on the other side of the rectangular frame 1. A lower plate connecting screw 6 is fixedly installed on the inner side of the lower pressure plate 5. A connecting piece 12 is fixedly installed on the inner side of the lower plate connecting screw 6. A clamping block 13 is fixedly connected to one side of the connecting piece 12. An outlet conduit 14 is engaged with the inner side of the clamping block 13.
[0026] The four corners of one end of the rectangular frame 1 are all provided with smooth chamfers 17. Multiple frame connecting screws 2 are fixedly installed on the inner side of the rectangular frame 1. Side guide plates 16 are fixedly connected to the four sides of the rectangular frame 1.
[0027] In use, the smooth chamfer 17 is used for the rectangular frame 1 through casting, and the side guide plate 16 is used for auxiliary guidance. A connecting slot 9 is provided on one side of the cone connecting column 8, and crossbeam connecting blocks 7 are fixedly installed at the four corners of the rectangular frame 1. A corresponding fixing block 15 is fixedly installed on one side of the outlet conduit 14.
[0028] In use, the connecting bayonet 9 is used to connect the cone connecting column 8, the crossbeam connecting block 7 is used to fix the rectangular frame 1, and the corresponding fixing block 15 is used to fix the outlet conduit 14.
[0029] In practical use, to reduce capital investment, the existing guide beam is reused on the basis of the original guide frame. It is rotated 90° and welded to the guide frame. The fixing bolts can move freely in the guide groove, which reduces the installation difficulty and enhances the stability. The upper guide cover is redesigned. The upper cover changes the contact between the guide and the guide beam from point contact to surface contact, which increases the fixing strength of the guide and can eliminate the shaking of the guide during rolling. After the implementation of the improvement measures, the problem of bending of the bar head is effectively solved, the appearance quality of special steel is significantly improved, the cost per ton of steel is reduced, the delivery time is significantly shortened, and the inventory of unplanned steel such as excessive scrap ratio is reduced.
[0030] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of this utility model, and are not intended to limit it. Although this utility model has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some or all of the technical features therein. Such modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of this utility model.
Claims
1. An improved exit guide structure for a medium bar rolling mill, characterized in that, The device includes a rectangular frame (1), an upper pressure plate (3) is fixedly installed on one side of the rectangular frame (1), an upper plate connecting screw (4) is fixedly installed on the inner side of the upper pressure plate (3), a conical connecting column (8) is engaged at one end of the upper plate connecting screw (4), a top plate (10) is fixedly connected at one end of the conical connecting column (8), an outlet nose cone (11) is fixedly connected at one end of the top plate (10), a lower pressure plate (5) is fixedly installed on the other side of the rectangular frame (1), a lower plate connecting screw (6) is fixedly installed on the inner side of the lower pressure plate (5), a connecting piece (12) is fixedly installed on the inner side of the lower plate connecting screw (6), a clamping block (13) is fixedly connected on one side of the connecting piece (12), and an outlet conduit (14) is engaged on the inner side of the clamping block (13).
2. The improved exit guide structure for a medium bar mill according to claim 1, characterized in that, The four corners of one end of the rectangular frame (1) are all provided with smooth chamfers (17).
3. An improved exit guide structure for a medium bar mill according to claim 2, characterized in that, Multiple frame connecting screws (2) are fixedly installed on the inner side of the rectangular frame (1), and side guide plates (16) are fixedly connected to the four sides of the rectangular frame (1).
4. An improved exit guide structure for a medium bar mill according to claim 1, characterized in that, A connecting slot (9) is provided on one side of the conical connecting column (8).
5. An improved exit guide structure for a medium bar mill according to claim 1, characterized in that, The four corners of the rectangular frame (1) are all fixed with crossbeam connecting blocks (7).
6. An improved exit guide structure for a medium bar mill according to claim 1, characterized in that, A corresponding fixing block (15) is fixedly installed on one side of the outlet conduit (14).
7. An improved exit guide structure for a medium bar mill according to claim 1, characterized in that, The upper pressure plate (3) changes the point contact between the guide and the guide beam to a surface contact.