A rolling mill

Abstract

The application discloses a rolling mill. The rolling mill comprises an upper roller, a lower roller, limiting bearings and a fixed shaft. The upper roller and the lower roller are oppositely arranged. Two limiting bearings are arranged at two ends of the upper roller and the lower roller respectively. The same end of the upper roller and the lower roller is connected with the peripheral surface of the same limiting bearing. The limiting bearing is sleeved on the fixed shaft. The first interval is formed between the inner periphery surface of the axial end of the inner ring of the limiting bearing and the peripheral surface of the fixed shaft. The application can at least reduce the stress concentration of the axial end of the inner ring of the limiting bearing to some extent, so that the damage of the limiting bearing is avoided, the service life of the limiting bearing is prolonged, and the production efficiency of the rolling mill is improved.

Description

TECHNICAL FIELD

[0001] The application belongs to the technical field of rolling mills, and particularly relates to a rolling mill. BACKGROUND

[0002] In a 20-high rolling mill, the work rolls are two oppositely arranged upper rolls and lower rolls, each end of the work rolls is provided with a limiting bearing, the axial direction of the limiting bearing is arranged vertically, and the upper peripheral surface of the limiting bearing is in contact with the end surface of the upper roll, and the lower peripheral surface of the limiting bearing is in contact with the end surface of the lower roll, so as to limit the axial displacement of the work rolls through the two limiting bearings.

[0003] However, in the operation process of the 20-high rolling mill, the limiting bearing is mainly subjected to the eccentric load of the upper roll and the lower roll, and especially when the rolling mill is performing plate shape adjustment, the roll shifting adjustment will be frequently performed, and the work rolls will also be extruded against the limiting bearing due to the bearing of the inter-roll friction force. Thus, the limiting bearing is prone to damage, the service life of the limiting bearing is relatively short, which is far lower than the designed service life of 500 hours, the limiting bearing is damaged before reaching the theoretical service life, and the production efficiency of the 20-high rolling mill is affected. SUMMARY

[0004] The application aims to at least solve the technical problem that the limiting bearings at both ends of the 20-high rolling mill are prone to damage and have a relatively short service life. To this end, the application provides a rolling mill.

[0005] The technical scheme of the application is as follows:

[0006] The application provides a rolling mill, which comprises:

[0007] an upper roll;

[0008] a lower roll, which is oppositely arranged with the upper roll;

[0009] two limiting bearings, which are arranged at both ends of the upper roll and the lower roll, and the same end of the upper roll and the lower roll is connected with the peripheral surface of the same limiting bearing;

[0010] a fixed shaft, the limiting bearing is sleeved on the fixed shaft, and the first interval is formed between the inner peripheral surface of the axial end of the inner ring of the limiting bearing and the peripheral surface of the fixed shaft.

[0011] In some embodiments, the width of the first interval is 0.05mm-0.15mm.

[0012] In some embodiments, the fixed shaft is provided with a relief groove, and the inner wall of the relief groove and the inner peripheral surface of the axial end of the inner ring of the limiting bearing form the first interval.

[0013] In some embodiments, the bottom wall of the avoiding groove is inclined towards the axis of the fixing shaft.

[0014] In some embodiments, the inner periphery surface of the inner ring of the limiting bearing at both axial ends has the first spacing with the peripheral surface of the fixing shaft.

[0015] In some embodiments, the fixing shaft comprises a shaft body and limiting parts arranged at both ends of the shaft body, the limiting bearing is sleeved on the shaft body, and the limiting bearing is arranged between the two limiting parts, wherein the second spacing is between the end of the limiting bearing and the limiting part.

[0016] In some embodiments, the rolling mill further comprises a support, the limiting bearing is connected to the support through the fixing shaft, and the support is fixedly connected to the frame of the rolling mill.

[0017] In some embodiments, the fixing shaft comprises a shaft body and limiting parts arranged at both ends of the shaft body, the shaft body is connected to the inner ring, and the limiting bearing is arranged between the two limiting parts.

[0018] The support comprises two support parts arranged at intervals, the limiting bearing is arranged between the two support parts, the shaft body is arranged on the two support parts, and the limiting part is connected to the corresponding support part.

[0019] In some embodiments, the rolling mill further comprises a buffer connected between the support and the frame.

[0020] In some embodiments, the rolling mill further comprises a lubricating device arranged corresponding to the limiting bearing.

[0021] The embodiments of the present application have at least the following beneficial effects:

[0022] The rolling mill proposed in this application comprises two opposing upper and lower rolls. To limit the axial displacement of the work rolls, limit bearings are installed at both ends of the work rolls. The outer circumferential surface of the limit bearing at one end of the work roll is connected to the end faces of both the upper and lower rolls, thereby limiting the axial displacement of the work rolls. The limit bearings are sleeved on a fixed shaft for fixed installation. During the operation of the rolling mill, the upper and lower rolls alternately or simultaneously apply eccentric loads to the limit bearings. For example, when the upper roll primarily applies force to the limit bearing, the end of the inner ring of the limit bearing connected axially to the upper roll will be pressed against the fixed shaft, causing stress concentration at the upper axial end of the bearing's inner ring and resulting in damage. Therefore, a first gap is set between the inner circumferential surface of the inner ring at the axial end and the circumferential surface of the fixed shaft. This allows for a certain amount of movement between the inner circumferential surface of the inner ring at the axial end and the circumferential surface of the fixed shaft when the upper and lower rolls of the work roll apply force to the limit bearing. This reduces stress concentration at the axial end of the inner ring, thereby preventing damage to the limit bearing, extending its service life, and improving the production efficiency of the rolling mill. Attached Figure Description

[0023] To more clearly illustrate the technical solutions in the embodiments of this application, the accompanying drawings used in the description of the embodiments will be briefly introduced below. Obviously, the accompanying drawings described below are some embodiments of this application. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0024] Figure 1 This is a schematic diagram of the structure of the rolling mill according to an embodiment of this application;

[0025] Figure 2 for Figure 1 A schematic diagram of the structure of a rolling mill after the frame has been removed;

[0026] Figure 3 for Figure 2 A sectional view of the overall structure in the middle;

[0027] Figure 4 for Figure 3 An enlarged view of part A in the image;

[0028] Figure 5 for Figure 4 An enlarged view of part B in the image.

[0029] Figure label:

[0030] 100, upper roller; 200, lower roller; 300, limiting bearing; 310, inner ring; 320, outer ring; 400, fixed shaft; 410, shaft body; 411, avoiding groove; 420, limiting part; 500, bracket; 510, supporting part; 511, oil hole; 520, fixing part; 530, position accuracy measuring surface; 600, buffer; 700, lubricating device; 800, rack. DETAILED DESCRIPTION

[0031] The technical solutions in the embodiments of the present application will be described clearly and completely below in combination with the drawings in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, rather than all the embodiments of the present application. Based on the embodiments in the present application, all the other embodiments obtained by those skilled in the art without creative work are within the scope of protection of the present application.

[0032] In addition, the reference numbers and / or reference letters can be repeated in different examples in the present application, and such repetition is for the purpose of simplification and clarity, and does not indicate the relationship between the various embodiments and / or settings discussed. In addition, the present application provides examples of various specific processes and materials, but those skilled in the art can realize the application of other processes and / or the use of other materials.

[0033] The present application will be described below in combination with the drawings and with reference to specific embodiments:

[0034] Please refer to Figures 1-5 The embodiments of the present application provide a rolling mill, which combines Figure 1 The rolling mill comprises an upper roller 100, a lower roller 200, a limiting bearing 300 and a fixed shaft 400.

[0035] The upper roller 100 in the embodiments of the present application is arranged opposite to the lower roller 200, two limiting bearings 300 are arranged at two ends of the upper roller 100 and the lower roller 200 respectively, the same end of the upper roller 100 and the lower roller 200 is connected with the peripheral surface of the same limiting bearing 300, the limiting bearing 300 is sleeved on the fixed shaft 400, and the first interval is formed between the inner peripheral surface of the end part of the inner ring 310 of the limiting bearing 300 in the axial direction and the peripheral surface of the fixed shaft 400.

[0036] Specifically, since the work roll is composed of the upper roll 100 and the lower roll 200 arranged oppositely, in order to limit the axial displacement of the work roll, the limiting bearing 300 is arranged at both ends of the work roll, and the outer circumferential surface of the outer ring 320 of the limiting bearing 300 arranged at one end of the work roll is connected with the end surface of the upper roll 100 and the end surface of the lower roll 200 at the same time, so as to limit the axial displacement of the work roll through the limiting bearing 300. The inner ring 310 of the limiting bearing 300 is sleeved on the fixed shaft 400, so as to realize the fixed arrangement of the limiting bearing 300 through the fixed shaft 400. During the operation of the rolling mill, the upper roll 100 and the lower roll 200 of the work roll will alternately or simultaneously exert a biasing force on the limiting bearing 300. For example, when the upper roll 100 mainly exerts a force on the limiting bearing 300, the upper end of the inner ring 310 of the limiting bearing 300 in the axial direction will be extruded with the fixed shaft 400, so as to cause stress concentration at the upper end of the inner ring 310 in the axial direction and cause damage. Therefore, the first spacing is arranged between the inner circumferential surface of the end portion of the inner ring 310 in the axial direction and the circumferential surface of the fixed shaft 400, so that when the upper roll 100 and the lower roll 200 of the work roll exert a force on the limiting bearing 300, the inner circumferential surface of the end portion of the inner ring 310 in the axial direction of the limiting bearing 300 has a certain space with the circumferential surface of the fixed shaft 400, so as to reduce the stress concentration at the end portion of the inner ring 310 in the axial direction, thereby avoiding the damage of the limiting bearing 300, prolonging the service life of the limiting bearing 300, and improving the production efficiency of the rolling mill.

[0037] In some embodiments, the rolling mill can be a twelve-high rolling mill, an eighteen-high rolling mill, a twenty-high rolling mill, etc., and the present application is not limited thereto. In the present application, the rolling mill is a twenty-high rolling mill. Correspondingly, the axial direction of the limiting bearing 300 is usually arranged in the vertical direction.

[0038] In some embodiments, the width of the first spacing is 0.05mm-0.15mm, so as to ensure the use efficiency of the limiting bearing 300 by arranging the first spacing in the width range. Avoiding that the first spacing is too small, so as to effectively reduce the stress concentration at the end portion of the inner ring 310 in the axial direction of the limiting bearing 300. And avoiding that the second spacing is too large, so as to affect the strength of the fixed shaft 400.

[0039] In some embodiments, as shown in FIG. 2, the first spacing is arranged between the inner circumferential surface of the end portion of the inner ring 310 in the axial direction and the circumferential surface of the fixed shaft 400. Figures 2-5The fixed shaft 400 is provided with the avoiding groove 411, and the inner wall of the avoiding groove 411 and the inner periphery surface of the axial end of the inner ring 310 of the limiting bearing 300 form a first interval. By opening the avoiding groove 411 on the fixed shaft 400, the technical effect that the inner periphery surface of the axial end of the inner ring 310 of the limiting bearing 300 and the peripheral surface of the fixed shaft 400 have a first interval is realized. In the operation process of the rolling mill, the limiting bearing 300 is an industrial consumable, and needs to be replaced after a certain use time. The service life of the fixed shaft 400 is much longer than that of the limiting bearing 300, so the avoiding groove 411 is opened on the fixed shaft 400. In addition, the inner ring 310 of the limiting bearing 300 is usually provided with a chamfer, which can play a role in reducing stress concentration.

[0040] In some embodiments, as shown in Figure 5 The bottom wall of the avoiding groove 411 is inclined towards the axis of the fixed shaft 400. From the fixed shaft 400, the diameter of the part of the avoiding groove 411 on the fixed shaft 400 decreases from the center to the end, so as to fit the deformation of the axial two ends of the inner ring 310 of the limiting bearing 300. In addition, the wall surface of the avoiding groove 411 is smooth and avoids stress concentration on the fixed shaft 400, which reduces the strength of the fixed shaft 400.

[0041] In some embodiments, as shown in Figure 4 The inner periphery surface of the axial two ends of the inner ring 310 of the limiting bearing 300 and the peripheral surface of the fixed shaft 400 have a first interval. In actual setting, the avoiding groove 411 can be arranged at one end of the fixed shaft 400, or at both ends of the fixed shaft 400, which needs to be determined according to the actual situation, and the embodiments of the present application do not limit this. In the embodiments of the present application, the rolling mill is a twenty-roll rolling mill, and the axial two ends of the inner ring 310 of the limiting bearing 300 will be subjected to the force of the upper roller 100 and the lower roller 200 respectively. Therefore, the inner periphery surface of the axial two ends of the inner ring 310 of the limiting bearing 300 and the peripheral surface of the fixed shaft 400 need to have a first interval, that is, the avoiding groove 411 is arranged at both ends of the fixed shaft 400.

[0042] In some embodiments, as shown in Figure 4 The fixed shaft 400 includes a shaft body 410 and a limiting portion 420, the two ends of the shaft body 410 are provided with the limiting portion 420, the limiting bearing 300 is sleeved on the shaft body 410, and the limiting bearing 300 is arranged between the two limiting portions 420, wherein the second interval is between the end of the limiting bearing 300 and the limiting portion 420. By the second interval, the deformation amount of the inner ring 310 of the limiting bearing 300 when subjected to the force is further satisfied, so as to further avoid damage to the limiting bearing 300.

[0043] In some embodiments, as shown in Figure 2 The rolling mill further comprises a support 500, and the limiting bearing 300 is connected to the support 500 through the fixing shaft 400. The support 500 is fixedly connected to the frame 800 of the rolling mill, so that the limiting bearing 300 is fixed to the frame 800 of the rolling mill through the support 500.

[0044] In some embodiments, as shown in Figure 2 The support 500 is provided with a position precision measurement surface 530. When the limiting bearing 300 is installed and debugged, the height of the support 500 is measured through the position precision measurement surface 530 of the support 500 by using a total station, so that the center height of the support 500 is adjusted to 1102±0.5mm and the bidirectional level is within 0.1mm / m.

[0045] In some embodiments, as described above, the fixing shaft 400 comprises a shaft body 410 and limiting portions 420 arranged at both ends of the shaft body 410. The limiting bearing 300 is sleeved on the shaft body 410, and the limiting bearing 300 is arranged between the two limiting portions 420. As shown in Figure 3 In order to fix the bearing on the support 500, the support 500 comprises two support portions 510 arranged at intervals, the limiting bearing 300 is arranged between the two support portions 510, the shaft body 410 is arranged on the two support portions 510, and the limiting portion 420 is connected to the corresponding support portion 510. Further, one limiting portion 420 can be fixedly connected to the shaft body 410, and the other limiting portion 420 can be detachably connected to the shaft body 410, so as to arrange the limiting bearing 300 between the two support portions 510 of the support 500, arrange the shaft body 410 on the support portions 510 and the limiting bearing 300, and then connect the detachable limiting portion 420 to the shaft body 410, so as to fix the limiting bearing 300 on the support 500, and facilitate the disassembly and assembly of the limiting bearing 300 on the support 500. It should be noted that the limiting portion 420 detachably connected to the shaft body 410 can be connected to the shaft body 410 by screwing, clamping or other connection methods, which are not limited in the embodiments of the present application. In the embodiments of the present application, the limiting portion 420 detachably connected to the shaft body 410 is connected to the shaft body 410 by screwing.

[0046] In some embodiments, as shown in Figure 2As shown, the rolling mill further comprises a buffer 600 connected between the support 500 and a frame 800 of the rolling mill, so as to buffer the force borne by the limiting bearing 300 through the buffer 600, to avoid damage to the limiting bearing 300. The support 500 further comprises a fixing portion 520 arranged opposite to the supporting portion 510, and the fixing portion 520 of the support 500 is connected with the buffer 600. In the embodiment of the present application, the buffer 600 is integrally arranged on the fixing portion 520 of the support 500. Of course, the buffer 600 can also be connected as a separate component on the fixing portion 520 of the support 500, and the embodiment of the present application is not limited in this regard.

[0047] In some embodiments, the material of the buffer 600 can be rubber, plastic, foam, sponge, etc., and the embodiment of the present application is not limited in this regard. In order to ensure the buffering effect of the buffer 600, the material parameters of the buffer 600 are set as follows: hardness HB 4.0~5.5; compressive strength: 16.52MPa~22.52MPa; tensile strength: 19.61Pa~35.21Pa. Of course, the buffer 600 can also be an elastic structural component such as a spring, and the embodiment of the present application is not limited in this regard.

[0048] In some embodiments, as shown in Figure 1 As shown, the rolling mill further comprises a lubricating device 700 arranged corresponding to the limiting bearing 300, so as to provide lubricating oil for the limiting bearing 300 and the end face of the work roll through the lubricating device 700, to lubricate the limiting bearing 300 and the end face of the work roll.

[0049] In some embodiments, as shown in Figure 4 As shown, the two supporting portions 510 of the support 500 are provided with through oil holes 511, and the oil outlet of the lubricating device 700 is arranged corresponding to the oil holes 511 on the support 500, so as to better lubricate the limiting bearing 300 and the end face of the work roll through the oil holes 511.

[0050] In the present application, unless otherwise explicitly specified and limited, "on" or "under" of a first feature to a second feature can include that the first and second features are in direct contact, or that the first and second features are not in direct contact but are in contact through another feature between them. Moreover, "on", "above" and "above" of the first feature to the second feature include that the first feature is directly above and obliquely above the second feature, or only indicates that the horizontal height of the first feature is higher than that of the second feature. "Below", "below" and "below" of the first feature to the second feature include that the first feature is directly below and obliquely below the second feature, or only indicates that the horizontal height of the first feature is less than that of the second feature.

[0051] In the description of the present application, it should be understood that the terms "center", "longitudinal", "transverse", "length", "width", "thickness", "upper", "lower", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise" indicate the orientation or positional relationship shown in the drawings, which are only for the convenience of describing the present application and simplifying the description, and do not indicate or imply that the devices or elements referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as limiting the present application.

[0052] It should be noted that all directional indications in the embodiments of the present application are only used to explain the relative position relationship, movement condition and the like between the components in a certain posture, and if the certain posture changes, the directional indications also change accordingly.

[0053] In the present application, unless otherwise explicitly specified and limited, the terms "connection", "fixation" and the like should be understood broadly, for example, "fixation" can be fixed connection, or detachable connection, or integral; can be mechanical connection, or electrical connection; can be direct connection, or indirect connection through intermediate medium; can be internal connection of two elements or interaction relationship between two elements, unless otherwise explicitly limited. For those skilled in the art, the specific meaning of the above terms in the present application can be understood according to the specific circumstances.

[0054] In addition, the description such as "first", "second" and the like in the present application is only for the purpose of description, and cannot be understood as indicating or implying the relative importance of the indicated technical features or implying the number of the indicated technical features. Therefore, the features limited by "first", "second" can include one or more of the features explicitly or implicitly. In the description of the present application, the meaning of "multiple" is two or more, unless otherwise explicitly specified and limited.

[0055] In the description of the present application, the description of the terms "one embodiment", "some embodiments", "example", "specific example", or "some examples" means that the specific features, structures, materials or characteristics described in connection with the embodiment or example are included in at least one embodiment or example of the present application. In the present specification, the illustrative description of the above terms does not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described can be combined in any one or more embodiments or examples in a suitable manner. In addition, those skilled in the art can combine and combine different embodiments or examples described in the present specification.

[0056] In addition, the technical solutions among various embodiments can be combined with each other, but it must be based on that a person skilled in the art can realize, when the combination of technical solutions appears contradictory or cannot be realized, it should be considered that the combination of technical solutions does not exist, and is not within the protection scope required by the present application.

[0057] Although the embodiments of the present application have been shown and described, those skilled in the art can understand that various changes, modifications, replacements and variations can be made to the embodiments without departing from the principles and purposes of the present application, the scope of the present application is defined by the claims and their equivalents.

Claims

1. A rolling mill, characterized in that, The rolling mill comprises: an upper roller; a lower roller, which is arranged opposite to the upper roller; two limiting bearings, which are arranged at two ends of the upper roller and the lower roller respectively, and the same end of the upper roller and the lower roller is connected with the peripheral surface of the same limiting bearing; a fixed shaft, the limiting bearing is sleeved on the fixed shaft, and the inner periphery surface of the axial end of the inner ring of the limiting bearing and the peripheral surface of the fixed shaft have a first spacing; wherein, when the upper roller or the lower roller of the working roller exerts a force on the limiting bearing, the first spacing allows the inner periphery surface of the axial end of the inner ring of the limiting bearing and the peripheral surface of the fixed shaft to have a moving space.

2. Rolling mill according to claim 1, characterized in that The width of the first spacing is 0.05mm~0.15mm.

3. Rolling mill according to claim 1, characterized in that The fixed shaft is provided with a avoiding slot, and the inner wall of the avoiding slot and the inner periphery surface of the axial end of the inner ring of the limiting bearing form the first spacing.

4. Rolling mill according to claim 3, characterized in that The bottom wall of the avoiding slot is inclined towards the axis of the fixed shaft.

5. Rolling mill according to any one of claims 1-4, characterized in that The fixed shaft comprises a shaft body and limiting portions arranged at two ends of the shaft body, the limiting bearing is sleeved on the shaft body, and the limiting bearing is arranged between the two limiting portions, wherein the second spacing is between the end of the limiting bearing and the limiting portion.

6. Rolling mill according to any one of claims 1-4, characterized in that The rolling mill further comprises a support, the limiting bearing is connected to the support through the fixed shaft, and the support is fixedly connected to the frame of the rolling mill.

7. Rolling mill according to claim 6, characterized in that The fixed shaft comprises a shaft body and limiting portions arranged at two ends of the shaft body, the shaft body is connected with the inner ring, and the limiting bearing is arranged between the two limiting portions; The support comprises two spaced support portions, the limiting bearing is arranged between the two support portions, the shaft body is arranged on the two support portions, and the limiting portion is connected with the corresponding support portion.

8. Rolling mill according to claim 6, characterized in that The rolling mill further comprises a buffer, which is connected between the support and the frame.

9. Rolling mill according to any one of claims 1-4, characterized in that The rolling mill further comprises a lubricating device, which is arranged corresponding to the limiting bearing.

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