Method for adjusting large opening of short stress rolling mill
By designing a large-aperture roll gap adjustment device, the adjustment problem of short-stress rolling mills under large-aperture requirements was solved, achieving stable guidance and cost reduction, and meeting the production needs of the new process.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Patents(China)
- Current Assignee / Owner
- SINOSTEEL XIAN MACHINERY
- Filing Date
- 2023-03-03
- Publication Date
- 2026-05-12
AI Technical Summary
Existing short-stress rolling mills cannot meet the roll opening adjustment range requirements of new processes when faced with large opening requirements, resulting in insufficient equipment improvement and affecting production efficiency and cost.
By selecting and retaining parameters, a large-aperture roll gap adjustment device is designed. Utilizing the preconditions for roll gap adjustment, the guide surface length of the bearing seat is increased, thereby increasing the range of opening adjustment. An embedded guide component is used to ensure stable guidance.
It has enabled stable adjustment of short-stress rolling mills within a large opening range, reduced equipment weight and cost, improved production efficiency, and met the rolling requirements of the new process.
Smart Images
Figure CN116159867B_ABST
Abstract
Description
Technical Field
[0001] This invention relates to the field of metal rolling technology, and in particular to a method for adjusting the large opening degree of a short-stress rolling mill. Background Technology
[0002] Short-stress rolling mills offer high rigidity and minimize stress lines during rolling; they produce high-precision products, allowing for rapid symmetrical adjustment of the roll gap during reduction and precise die alignment through axial adjustment, while maintaining stable and convenient operation; they distribute rolling force evenly, resulting in long bearing life; they are highly efficient, as the corresponding rolls and guides are pre-installed and adjusted during roll changes and offline operation, saving downtime; and they are cost-effective, significantly reducing equipment weight and allowing for smaller bearing and other component sizes compared to equivalent arch mills, thus lowering investment costs. Due to these numerous advantages, short-stress rolling mills have become the dominant type of bar and wire rod mill.
[0003] The short-stress rolling mill core mainly consists of a roll gap adjustment device, a tie rod assembly, and a roll system assembly. The main components of the roll system assembly are bearing housings, tie rods, rolls, and support seats. Four tie rods with left and right threads are used to fix the upper and lower bearing housings together via copper nuts, creating a shorter stress line length. The roll gap adjustment device is used to adjust the roll opening. A hydraulic motor drives the tie rods to rotate via a worm gear pair. The left and right threaded nuts in the upper and lower bearing housings achieve symmetrical adjustment of the upper and lower rolls relative to the rolling line through the rotation of the tie rods. To prevent roll tilting, the roll gap adjustment device is equipped with a clutch for easy unilateral adjustment.
[0004] With the rapid development of new rolling technologies and processes, such as continuous casting and rolling, high-precision rolling, low-temperature rolling, controlled cooling technology, and hole-less rolling, and the increasingly fierce market competition placing higher demands on the quality of bar and wire rod products, production equipment, technology, and processes must be constantly updated and improved, with short-stress rolling mills bearing the brunt. In particular, with the continuous increase in rolling mill capacity and the mature application of hole-less rolling technology, billet sizes are constantly increasing, requiring a correspondingly larger adjustment range for roll opening. Therefore, existing equipment can no longer meet the requirements of the new processes, and the guiding range of the support seat to the bearing seat must meet the requirements of the large roll opening.
[0005] Currently, the only option is to replace other mill models to achieve product rolling, and there are no improvement or optimization measures based on the existing short-stress mill to meet the requirements of large opening. Summary of the Invention
[0006] This invention provides a method for adjusting the roll gap to a large opening in a short-stress rolling mill. First, retained parameters are selected. Based on these parameters, preconditions for roll gap adjustment are determined. Then, a large-opening roll gap adjustment device is designed using these parameters and preconditions. This device can adjust the roll gap opening.
[0007] The technical solution for achieving the objective of this invention is as follows:
[0008] A method for adjusting the large opening degree of a short-stress rolling mill includes the following steps:
[0009] Step 1: Eliminate parameters in short-stress rolling mills that cannot be adjusted for roll gap variations;
[0010] Step 2: Retain the parameters in the short-stress rolling mill that allow for adjustment of the roll gap, and obtain the retained parameters;
[0011] Step 3: Select one parameter from the retained parameters as the roll gap adjustment parameter;
[0012] Step 4: Determine the prerequisites for roll gap adjustment based on the roll gap adjustment parameters;
[0013] Step 5: Design a large-aperture roll gap adjustment device based on the retained parameters and the preconditions for roll gap adjustment.
[0014] This invention selects and retains parameters, determines the preconditions for roll gap adjustment based on the retained parameters, and designs a large-aperture roll gap adjustment device based on the retained parameters and the preconditions for roll gap adjustment. The large-aperture roll gap adjustment device can adjust the roll gap opening.
[0015] In one possible implementation, the parameters removed in step one include:
[0016] Height from the center of the bearing hole of the upper bearing seat of the short stress mill to the lower edge of the upper bearing seat of the short stress mill, height from the center of the bearing hole of the lower bearing seat of the short stress mill to the upper edge of the lower bearing seat of the short stress mill, and height of the guide surface of the support seat;
[0017] The parameters to be retained in step two include:
[0018] The opening degree of the rolling mill, and the height from the lower edge of the upper bearing seat to the upper edge of the lower bearing seat of the short-stress rolling mill;
[0019] In step three, the roll gap adjustment parameter is the height from the center of the bearing hole of the lower bearing seat of the short stress mill to the upper edge of the lower bearing seat of the short stress mill.
[0020] The prerequisite for adjusting the roll gap in step four is that the support base of the short-stress mill always maintains stable guidance for the upper and lower bearing seats.
[0021] In one possible implementation, the support of the short-stress rolling mill maintains stable guidance for both the upper and lower bearing housings, including:
[0022] When the short-stress rolling mill has its maximum opening, the large-opening roll gap adjustment device ensures that the upper and lower bearing seats do not separate.
[0023] When the short-stress rolling mill has its minimum opening, the large-opening roll gap adjustment device ensures that the upper and lower bearing seats do not interfere with each other.
[0024] In one possible implementation, the short-stress mill includes: an upper bearing housing for mounting the upper roll, a lower bearing housing for mounting the lower roll, and a support base that guides the relative movement of the upper and lower bearing housings. The upper and lower bearing housings are connected to 4 tie rods by 4x2N nuts. The 4N nuts are fixed to the upper bearing housing and connected to the upper part of the 4 tie rods, and the 4N nuts are fixed to the lower bearing housing and connected to the lower part of the 4 tie rods. The tie rods are rotated to adjust the distance between the upper and lower bearing housings, thereby adjusting the opening degree of the upper and lower rolls, where N≥1.
[0025] The large opening roller gap adjustment device includes: an upper receiving cavity opened on the surface of the upper bearing seat relative to the lower bearing seat, a lower receiving cavity opened on the surface of the lower bearing seat relative to the upper bearing seat, an upper bearing seat boss installed in the upper receiving cavity, and a lower bearing seat boss installed in the lower receiving cavity; the upper receiving cavity opens downward and the lower receiving cavity opens upward.
[0026] A protrusion extends from the upper bearing seat boss, with the protrusion facing the lower bearing seat boss. A recess is provided on the lower bearing seat boss, with the opening of the recess facing the upper bearing seat boss. The protrusion is inserted into the recess to minimize the distance between the upper and lower bearing seats.
[0027] The protrusion and the recess are in contact with the guide surface of the support seat; the lower edge of the upper bearing seat is located in the middle of the height direction of the protrusion, and the upper edge of the lower bearing seat is located in the middle of the depth direction of the recess.
[0028] In one possible implementation, the upper bearing seat boss, the lower bearing seat boss, the protrusion, and the recess form a set of large-aperture guide components.
[0029] The guide device for a large-aperture short-stress rolling mill includes four sets of large-aperture guide components.
[0030] The upper bearing housing and the lower bearing housing form a set of bearing housings. The short-stress rolling mill includes two sets of bearing housings.
[0031] Each bearing housing is equipped with two sets of large-aperture guide components, which are located at both ends of the bearing housing.
[0032] In one possible implementation, the height of the upper bearing seat boss is less than the height of the protrusion, and the top surface of the upper bearing seat boss contacts the top of the upper receiving cavity. All the upper bearing seat bosses are located in the upper receiving cavity, and some of the protrusions are also located in the upper receiving cavity.
[0033] In one possible implementation, the depth of the recess is greater than half the thickness of the lower bearing seat boss; the height of the protrusion is greater than half the thickness of the lower bearing seat boss.
[0034] In one possible implementation, the lower edge of the upper bearing housing is higher than the apex of the guide surface on the support seat, and the bottom surface of the protrusion is lower than the apex of the guide surface on the support seat.
[0035] The upper edge of the lower bearing housing is lower than the bottom point of the guide surface on the support seat, and the top surface of the recess is higher than the bottom point of the guide surface on the support seat.
[0036] Compared with the prior art, the beneficial effects of the present invention are:
[0037] This invention selects and retains parameters, determines the preconditions for roll gap adjustment based on the retained parameters, and designs a large-aperture roll gap adjustment device based on the retained parameters and the preconditions for roll gap adjustment. The large-aperture roll gap adjustment device can adjust the roll gap opening. Attached Figure Description
[0038] Figure 1 A flowchart of a method for adjusting the large opening degree of a short-stress rolling mill provided by the present invention;
[0039] Figure 2 Figure 1 shows the large opening roller gap adjustment device provided by the present invention in the maximum opening state.
[0040] Figure 3 Figure 2 shows the large opening roller gap adjustment device provided by the present invention in the maximum opening state.
[0041] Figure 4 Figure 1 shows the large opening roller gap adjustment device provided by the present invention in the minimum opening state.
[0042] Figure 5 Figure 2 shows the large opening roller gap adjustment device provided by the present invention in the minimum opening state.
[0043] Figure 6 Before and after comparison of installing a large-aperture roll gap adjustment device on a short-stress rolling mill;
[0044] In the figure, 1-upper bearing housing; 2-support seat; 3-lower bearing housing; 4-pull rod; 5-upper bearing housing boss; 6-lower bearing housing boss; 7-protrusion; 8-recess; 9-lower edge; 10-upper edge; 11-guide surface. Detailed Implementation
[0045] The present invention will now be described in detail with reference to the embodiments shown in the accompanying drawings. However, it should be noted that these embodiments are not intended to limit the present invention. Equivalent changes or substitutions in function, method, or structure made by those skilled in the art based on these embodiments are all within the scope of protection of the present invention.
[0046] In the description of this embodiment, it should be understood that the terms "center", "longitudinal", "lateral", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", and "outer" indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing the invention and simplifying the description, and 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. Therefore, they should not be construed as limiting the invention.
[0047] Furthermore, the terms "installation," "connection," and "linking" should be interpreted broadly. For example, they can refer to fixed connections, detachable connections, or integral connections; they can refer to mechanical connections or electrical connections; they can refer to direct connections or indirect connections through an intermediate medium; and they can refer to the internal connection between two components. Those skilled in the art will understand the specific meaning of these terms in this invention based on the specific circumstances.
[0048] Please see Figure 1 This invention provides a method for adjusting the large opening degree of a short-stress rolling mill, comprising the following steps: Step 1, eliminating parameters in the short-stress rolling mill that cannot adjust the roll gap change; Step 2, retaining parameters in the short-stress rolling mill that can adjust the roll gap change, obtaining retained parameters; Step 3, determining one parameter from the retained parameters as the roll gap adjustment parameter; Step 4, determining the roll gap adjustment prerequisites based on the roll gap adjustment parameter; Step 5, designing a large opening degree roll gap adjustment device based on the retained parameters and the roll gap adjustment prerequisites.
[0049] In this embodiment of the invention, retained parameters are selected, and the preconditions for roll gap adjustment are determined based on the retained parameters. A large-aperture roll gap adjustment device is designed based on the retained parameters and the preconditions for roll gap adjustment. The large-aperture roll gap adjustment device can adjust the roll gap opening.
[0050] In the above solution, the parameters eliminated in step one of the embodiment of the present invention include: the height from the center of the bearing hole of the upper bearing block of the short-stress rolling mill to the lower edge of the upper bearing block of the short-stress rolling mill, the height from the center of the bearing hole of the lower bearing block of the short-stress rolling mill to the upper edge of the lower bearing block of the short-stress rolling mill, and the height of the guiding surface of the support block; the parameters retained in step two of the embodiment of the present invention include: the mill opening and the height from the lower edge of the upper bearing block of the short-stress rolling mill to the upper edge of the lower bearing block of the short-stress rolling mill; the roll gap adjustment parameter in step three of the embodiment of the present invention is the height from the center of the bearing hole of the lower bearing block of the short-stress rolling mill to the upper edge of the lower bearing block of the short-stress rolling mill; the prerequisite for roll gap adjustment in step four of the embodiment of the present invention is that the support block of the short-stress rolling mill always maintains stable guidance for the upper bearing block and the lower bearing block.
[0051] In the above solution, the support block of the short-stress rolling mill in the embodiment of the present invention always maintains stable guidance for the upper bearing block and the lower bearing block, including: when the short-stress rolling mill has the maximum opening, the large-opening roll gap adjustment device ensures that the upper bearing block and the lower bearing block do not disengage; when the short-stress rolling mill has the minimum opening, the large-opening roll gap adjustment device ensures that the upper bearing block and the lower bearing block do not interfere.
[0052] Please continue to refer to Figure 2 and Figure 3 , the parameters in the embodiment of the present invention Figure 2 and Figure 3 are represented as follows: A - mill opening; B - the height from the center of the bearing hole of the upper bearing block to the lower edge of the upper bearing block; the height from the center of the bearing hole of the lower bearing block to the upper edge of the lower bearing block; C - the original height from the lower edge of the upper bearing block to the upper edge of the lower bearing block; D - the height of the new mechanism from the lower edge of the upper bearing block to the upper edge of the lower bearing block; E - the height of the guiding surface of the support block. Among them, the mill opening A = 2B + C, where the value of B is determined during design and does not change with the adjustment of the roll gap adjustment device; the value of C in the formula changes with the adjustment of the large-opening roll gap adjustment device. The prerequisite for the short-stress rolling mill to work properly within the entire adjustment range from the maximum to the minimum opening is that the support block always maintains stable guidance for the bearing block. That is, when the opening is the maximum, D < E, ensuring that the upper and lower bearing blocks do not disengage; when the opening is the minimum, C ≥ 0, ensuring that the upper and lower bearing blocks do not interfere.
[0053] Please refer to Figure 6 , the short-stress rolling mill in the embodiment of the present invention includes: an upper bearing block 1 for installing the upper roll, a lower bearing block 3 for installing the lower roll, and a support block 2 for guiding the relative movement of the upper bearing block 1 and the lower bearing block 3. The upper bearing block 1 and the lower bearing block 3 are connected by 4x2N nuts and 4 tie rods 4. 4N nuts are fixed to the upper bearing block 1 and connected to the upper parts of the 4 tie rods 4, and 4N nuts are fixed to the lower bearing block 3 and connected to the lower parts of the 4 tie rods 4. The tie rods 4 rotate to adjust the distance between the upper bearing block 1 and the lower bearing block 3, thereby realizing the adjustment of the opening between the upper roll and the lower roll, N ≥ 1; Please refer to Figure 2, Figure 3 , Figure 4 and Figure 5 This invention provides a large-aperture roll gap adjustment device, comprising: an upper accommodating cavity formed on the surface of an upper bearing seat 1 relative to a lower bearing seat 3; a lower accommodating cavity formed on the surface of a lower bearing seat 3 relative to the upper bearing seat 1; an upper bearing seat boss 5 installed in the upper accommodating cavity; and a lower bearing seat boss 6 installed in the lower accommodating cavity; the upper accommodating cavity opens downwards, and the lower accommodating cavity opens upwards; a protrusion 7 extends from the upper bearing seat boss 5, the protrusion 7 facing the lower bearing seat boss 6; a recess 8 is formed on the lower bearing seat boss 6, the opening of the recess 8 facing the upper bearing seat boss 5; the protrusion 7 is inserted into the recess 8 to minimize the distance between the upper bearing seat 1 and the lower bearing seat 3; the protrusion 7 and the recess 8 contact the guide surface 11 of the support seat 2 to guide the adjustment of the opening of the short-stress rolling mill; the lower edge of the upper bearing seat 1 is located at the middle in the height direction of the protrusion 7, and the upper edge of the lower bearing seat 3 is located at the middle in the depth direction of the recess 8.
[0054] In this embodiment of the invention, the distance between the upper bearing seat 1 and the lower bearing seat 3 is controlled by rotating the tie rod 4. By using the method that the protrusion 7 extends beyond the upper bearing seat 1a by a distance and the recess 8 extends beyond the lower bearing seat 3b by a distance, the original maximum opening of the short stress rolling mill is increased by a+b, thereby increasing the opening of the short stress rolling mill and meeting the requirements for billet specification rolling.
[0055] Please continue reading. Figure 6 In this embodiment of the invention, the tie rod 4 fixes the copper nut and bearing seat, and the support seat 2 is used to fix the tie rod 4, while always guiding the bearing seat within the range of opening degree variation. The original opening degree adjustment range of this embodiment is small and cannot meet the requirements of large billets and new processes for increasing the roll opening degree adjustment range. At the maximum opening degree, the height C of the guide surface 11 must be less than the height E of the guide surface 11 of the support seat 2; at the minimum opening degree, the height C of the guide surface 11 = 0. To meet the maximum opening degree value, the design can increase the value of E, but the minimum opening degree value will increase accordingly, meaning the minimum opening degree cannot be met; to meet the minimum opening degree value, the design can decrease the value of E, but the maximum opening degree value will decrease accordingly, meaning the maximum opening degree cannot be met. Furthermore, the original opening degree adjustment range is small, the roll diameter design range is small, the wear-resistant layer thickness is small, the roll utilization rate is low, the production cost per ton of steel is greatly increased, reducing enterprise profits and market competitiveness. The large-aperture roll gap adjustment device of this invention addresses the issue of increasing the adjustment range of the mill opening due to larger billet sizes and new processes such as perforated rolling, and consequently increasing the opening of short-stress mills, requiring an extended guide surface 11 on the support seat 2 to the bearing seat, while ensuring stable guidance. More specifically, Figure 6In the formula: A is the mill opening; B is the height from the center of the bearing hole of the upper bearing block 1 to the lower edge of the upper bearing block 1 and the height from the center of the bearing hole of the lower bearing block 3 to the upper edge of the lower bearing block 3; C is the original height from the lower edge of the upper bearing block 1 to the upper edge of the lower bearing block 3; D is the height of the new mechanism from the lower edge of the upper bearing block 1 to the upper edge of the lower bearing block 3; E is the height of the guiding surface 11 of the support block 2, and the mill opening A = 2B + C. The value of B in the formula is determined during design and does not change with the adjustment of the roll gap adjustment device; the value of C in the formula changes with the adjustment of the roll gap adjustment device.
[0056] For the short-stress mill to operate properly throughout the entire adjustment range of the opening from the maximum to the minimum, it is necessary that the support block 2 always maintains stable guidance for the bearing block. That is, at the maximum opening, D < E to ensure that the upper and lower bearing blocks 3 do not disengage; at the minimum opening, C ≥ 0 to ensure that the upper and lower bearing blocks 3 do not interfere.
[0057] The advantages of the large-opening roll gap adjustment device of the embodiment of the present invention are as follows: (1) It meets the prerequisite for the short-stress mill to operate properly throughout the entire adjustment range of the opening from the maximum to the minimum. (2) It increases the guiding height between the support block 2 and the bearing block, effectively increasing the adjustment range of the opening. As can be seen from the comparison, at the maximum opening, the increased range value of the opening is C - D. (3) Under the same mill type, it reduces the weights of the bearing block and the support block 2, reducing the equipment cost. On the premise of meeting the strength requirements, the bearing block and the support block 2 will not increase in weight due to the increase in the range of the equipment opening required by the process. (4) The modified structural form can be solidified, enabling the structural form of the same-specification mills to be fixed, forming a standard type for mass production. It avoids different parameter forms for the same-specification mills, reducing the equipment interchangeability. Figure 6 Based on the above solution, please continue to refer to
[0058] 、 Figure 2 、 Figure 3 、 Figure 4 and Figure 5 Preferably, the upper bearing block boss 5, the lower bearing block boss 6, the protruding part 7, and the recessed part 8 form a set of large-opening guiding components; the large-opening roll gap adjustment device includes four sets of large-opening guiding components; the upper bearing block 1 and the lower bearing block 3 form a set of bearing blocks, and the short-stress mill includes two sets of bearing blocks; two sets of large-opening guiding components are arranged on each set of bearing blocks, and the two sets of large-opening guiding components are located at the two ends of the bearing block.
[0059] The embodiment of the present invention uses four sets of large-opening guiding components to jointly resist the acting forces during the operation of the short-stress mill, ensuring that the installation of the large-opening roll gap adjustment device does not affect the normal use of the short-stress mill.
[0060] Based on the above solution, please continue to refer to Figure 2 、 Figure 3 、 Figure 4 and Figure 5 Preferably, the height of the upper bearing seat boss 5 is less than the height of the protrusion 7, and the top surface of the upper bearing seat boss 5 is in contact with the top of the upper receiving cavity. All the upper bearing seat bosses 5 are located in the upper receiving cavity, and some of the protrusions 7 are also located in the upper receiving cavity.
[0061] Based on the above solutions, please continue to refer to... Figure 2 , Figure 3 , Figure 4 and Figure 5 Preferably, the depth of the recessed portion 8 is greater than half the thickness of the lower bearing seat boss 6; and the height of the protrusion 7 is greater than half the thickness of the lower bearing seat boss 6.
[0062] In this embodiment of the invention, the height of the protrusion 7 and the depth of the recess 8 are both greater than 1 / 2 the thickness of the lower bearing seat boss 6, thereby increasing the values of a and b, and thus significantly increasing the opening degree of the short stress rolling mill.
[0063] Based on the above solutions, please continue to refer to... Figure 2 , Figure 3 , Figure 4 and Figure 5 Preferably, the lower edge of the upper bearing seat 1 is higher than the apex of the upper guide surface 11 of the support seat 2, and the bottom surface of the protrusion 7 is lower than the apex of the upper guide surface 11 of the support seat 2; the upper edge of the lower bearing seat 3 is lower than the bottom point of the upper guide surface 11 of the support seat 2, and the top surface of the recess 8 is higher than the bottom point of the upper guide surface 11 of the support seat 2.
[0064] In the embodiment of the present invention, the apex of the guide surface 11 on the support seat 2 in the maximum opening state is located between the lower edge of the upper bearing seat 1 and the bottom surface of the protrusion 7, and the foot point of the guide surface 11 on the support seat 2 in the maximum opening state is located between the upper edge of the lower bearing seat 3 and the top surface of the recess 8.
[0065] In practical applications, the preferred method for adjusting the large-aperture roll gap is to modify the local structure of the bearing housing, design a boss at the guide point, and increase the height of the effective guide surface 11. Please continue reading. Figures 2 to 5 In this embodiment of the invention, the upper bearing seat boss 5 is designed to be convex, and the lower bearing seat boss 6 is designed to be concave, forming an embedded structure in the opening direction. The upper and lower bearing seat bosses 6 increase the guide surface 11, ensuring maximum opening without separation; the embedded structure within the upper and lower bearing seats 3 ensures minimum opening without interference. This embodiment of the invention guarantees the maximum and minimum opening and range required by the process. It can simultaneously satisfy the requirements for increasing the maximum opening and decreasing the minimum opening in short-stress rolling mills, increasing the opening adjustment range. The implementation process of this embodiment is as follows: the roll gap adjustment device drives the pull rod 4 to rotate, and the rotation of the pull rod 4 drives the left and right copper nuts at both ends of the pull rod 4 and the upper and lower bearing seats 3 to adjust symmetrically relative to the rolling line. Rolls are installed inside the bearing seats, achieving symmetrical adjustment of the roll opening relative to the rolling line.
[0066] The detailed descriptions listed above are merely specific descriptions of feasible embodiments of the present invention, and are not intended to limit the scope of protection of the present invention. All equivalent embodiments or modifications made without departing from the spirit of the present invention should be included within the scope of protection of the present invention.
[0067] It will be apparent to those skilled in the art that the present invention is not limited to the details of the exemplary embodiments described above, and that the invention can be implemented in other specific forms without departing from its spirit or essential characteristics. Therefore, the embodiments should be considered in all respects as exemplary and non-limiting, and the scope of the invention is defined by the appended claims rather than the foregoing description. Thus, all variations falling within the meaning and scope of equivalents of the claims are intended to be included within the present invention. No reference numerals in the claims should be construed as limiting the scope of the claims.
[0068] Furthermore, it should be understood that although this specification describes embodiments, not every embodiment contains only one independent technical solution. This narrative style is merely for clarity. Those skilled in the art should consider the specification as a whole, and the technical solutions in each embodiment can also be appropriately combined to form other embodiments that can be understood by those skilled in the art.
Claims
1. A method for adjusting the large opening degree of a short-stress rolling mill, characterized in that, Includes the following steps: Step 1: Eliminate parameters in short-stress rolling mills that cannot be adjusted for roll gap variations; Step 2: Retain the parameters in the short-stress rolling mill that allow for adjustment of the roll gap, and obtain the retained parameters; Step 3: Select one parameter from the retained parameters as the roll gap adjustment parameter; Step 4: Determine the prerequisites for roll gap adjustment based on the roll gap adjustment parameters; Step 5: Design a large-aperture roll gap adjustment device based on the retained parameters and the preconditions for roll gap adjustment; The short-stress rolling mill includes: an upper bearing housing for mounting the upper roll, a lower bearing housing for mounting the lower roll, and a support base that guides the relative movement of the upper and lower bearing housings. The upper and lower bearing housings are connected to 4 tie rods by 4x2N nuts. The 4N nuts are fixed to the upper bearing housing and connected to the upper part of the 4 tie rods, and the 4N nuts are fixed to the lower bearing housing and connected to the lower part of the 4 tie rods. The tie rods are rotated to adjust the distance between the upper and lower bearing housings, thereby adjusting the opening degree of the upper and lower rolls, where N≥1. The large opening roller gap adjustment device includes: an upper receiving cavity opened on the surface of the upper bearing seat relative to the lower bearing seat, a lower receiving cavity opened on the surface of the lower bearing seat relative to the upper bearing seat, an upper bearing seat boss installed in the upper receiving cavity, and a lower bearing seat boss installed in the lower receiving cavity; the upper receiving cavity opens downward and the lower receiving cavity opens upward. A protrusion extends from the upper bearing seat boss, with the protrusion facing the lower bearing seat boss. A recess is provided on the lower bearing seat boss, with the opening of the recess facing the upper bearing seat boss. The protrusion is inserted into the recess to minimize the distance between the upper and lower bearing seats. The protrusion and the recess are in contact with the guide surface of the support seat; the lower edge of the upper bearing seat is located in the middle of the height direction of the protrusion, and the upper edge of the lower bearing seat is located in the middle of the depth direction of the recess.
2. The method for adjusting the large opening degree of a short-stress rolling mill according to claim 1, characterized in that, The parameters removed in step one include: Height from the center of the bearing hole of the upper bearing seat of the short stress mill to the lower edge of the upper bearing seat of the short stress mill, height from the center of the bearing hole of the lower bearing seat of the short stress mill to the upper edge of the lower bearing seat of the short stress mill, and height of the guide surface of the support seat; The parameters to be retained in step two include: The opening degree of the rolling mill, and the height from the lower edge of the upper bearing seat to the upper edge of the lower bearing seat of the short-stress rolling mill; In step three, the roll gap adjustment parameter is the height from the center of the bearing hole of the lower bearing seat of the short stress mill to the upper edge of the lower bearing seat of the short stress mill. The prerequisite for adjusting the roll gap in step four is that the support base of the short-stress mill always maintains stable guidance for the upper and lower bearing seats.
3. The method for adjusting the large opening degree of a short-stress rolling mill according to claim 2, characterized in that, The support base of the short-stress rolling mill maintains stable guidance for the upper and lower bearing housings, including: When the short-stress rolling mill has its maximum opening, the large-opening roll gap adjustment device ensures that the upper and lower bearing seats do not separate. When the short-stress rolling mill has its minimum opening, the large-opening roll gap adjustment device ensures that the upper and lower bearing seats do not interfere with each other.