Working roll thrust mechanism of four-upright twenty-high roll mill
By improving the thrust bearing seat structure and oil injection cooling and lubrication device of the four-column type twenty-roll rolling mill, the rolling and fire problems caused by the asymmetric arrangement of the thrust bearings are solved, the stability and safety of the rolling mill are improved, and the Lifespan and reduce maintenance costs.
Patent Information
- Application Number
- CN202420097688.9
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-01-16
- Publication Date
- 2024-12-27
- Estimated Expiration
- 2034-01-16
AI Technical Summary
The design of the working roller thrust mechanism of the four-column type twenty-roll roll mill has unit pressure differences caused by the asymmetric arrangement of bearing seats, which can easily lead to work roller rafting and fire risks, and lack of effective cooling and lubrication devices, which affects production efficiency and safety.
E-type thrust bearing seat is designed to ensure that the thrust bearings on both sides are on the horizontal surface through asymmetrically arranged upper and lower support surfaces and reversed 180° installation. Combined with oil injection cooling lubricating device, oil pipes and spray heads are added to improve cooling effect and ensure uniformity. Lubricate and cool.
It effectively reduces work roller stuttering and fire accidents, improves production stability and safety, extends the service life of bearings and rolls, and reduces maintenance costs and fire risks.
Smart Images
Figure CN222241930U_ABST
Abstract
Description
Technical Field
[0001] The utility model belongs to the technical field of stainless steel cold rolling, and relates to a four-column type twenty-high rolling mill, in particular to a working roll thrust mechanism of the four-column type twenty-high rolling mill. Background Art
[0002] The four-column twenty-high rolling mill is a split-type rolling mill. It has great advantages in plate shape control and is currently one of the main models for cold rolling of stainless steel.
[0003] In order to achieve a larger deformation within one rolling process, the four-column twenty-high rolling mill uses a smaller working roll diameter of only 80-115mm. The working roll does not have a bearing seat. In order to prevent the working roll from moving axially during the rolling process, a thrust bearing is provided on the transmission side and the operating side of the rolling mill. The thrust bearings are clamped at both ends of the working roll and support the two ends of the working roll during the rolling process, thereby limiting the position of the working roll and preventing the working roll from shifting.
[0004] The thrust bearing is usually divided into two pieces, upper and lower, which are fixed on the thrust bearing seat respectively; the thrust bearing seat on the operating side is installed on the lower rolling mill door, and the thrust bearing seat on the transmission side is installed on the lower archway; the entire thrust mechanism is lubricated by rolling oil.
[0005] Since the thrust bearing seats on the operating side and the transmission side of the rolling mill are not on the same horizontal plane, the height after the rolling line is calculated by replacing the working rolls is based on the thrust bearing on the operating side of the rolling mill, which leads to the inconsistency of the contact area between the working roll heads and the thrust bearings on both sides of the transmission side and the operating side. During the rolling process, the axial force on the working rolls is very large, and the unit pressures on the thrust bearings on both sides are also very different. In addition, the working rolls are bent and deformed under the force, which easily leads to the working rolls on the side with a small contact area to get rid of the constraints of the thrust bearings, drill under the thrust bearing seat, and directly contact the mill arch; at the same time, the working rolls do not have special cooling and lubrication devices, and only rely on the rolling oil on the steel plate to flow to the bearings for cooling and lubrication. The four-column twenty-high rolling mill is a split mill, the arch is not well sealed, and the amount of rolling oil distributed to the thrust mechanism is very small, so the cooling effect is not good; when the thrust bearings are in the case of working roll shifting, the working rolls will cause huge impact wear on the thrust bearings, and the friction parts will have a large temperature increase due to insufficient cooling, which is very likely to cause fire.
[0006] Therefore, the current design of the thrust mechanism of the working rolls of the four-column twenty-high rolling mill has obvious defects, which has a great adverse impact on the production efficiency and maintenance of the rolling mill. Utility Model Content
[0007] The purpose of the utility model is to provide a four-column twenty-high rolling mill working roll thrust mechanism, to improve the structure of the thrust bearing seat, and to add a cooling system to solve the problems of rolling roll shifting and fire hazard, thereby enhancing the stability and safety of the rolling process of the rolling mill.
[0008] The technical solution adopted by the utility model to achieve the above-mentioned purpose is:
[0009] A thrust mechanism for a working roll of a four-column twenty-high rolling mill comprises a thrust bearing, a thrust bearing seat, and an oil-spray cooling and lubricating device; the thrust bearing is arranged on the thrust bearing seat, the thrust bearing seat is in an E-shape as a whole, and comprises a thrust bearing seat 1 and a thrust bearing seat 2, the thrust bearing seat 1 is fixed on the operating side of the rolling mill, the thrust bearing seat 2 is fixed on the transmission side, the upper and lower supporting surfaces of the thrust bearing seat 1 and the thrust bearing seat 2 are arranged asymmetrically in thickness, the thickness difference between the upper and lower supporting surfaces is the horizontal height difference between the thrust bearing seat 1 and the thrust bearing seat 2, and the thrust bearing seat 1 and the thrust bearing seat 2 are installed upside down by 180 degrees; the oil-spray cooling and lubricating device comprises an oil pipe and a nozzle, a nozzle is respectively arranged on both sides of the contact part between each thrust bearing and the rolling roll head, and the nozzle is connected to the oil inlet pipe of the oil spray guide plate of the rolling mill cooling system through upper and lower lubricating oil pipes.
[0010] The beneficial effects of the utility model are:
[0011] On the one hand, it greatly reduces the occurrence of rolling accidents, improves the operating rate, reduces the number and duration of abnormal shutdowns of the rolling mill, extends the service life of bearings and rolls, reduces the number of replacements, and reduces costs;
[0012] On the other hand, it avoids fire accidents caused by sparks generated by abnormal friction between the thrust bearing and the working roll contact surface, reducing the risk of fire. BRIEF DESCRIPTION OF THE DRAWINGS
[0013] Figure 1 It is a structural schematic diagram of the utility model;
[0014] Figure 2 It is a schematic diagram of the position relationship of the thrust bearing seats on both sides of the utility model;
[0015] Figure 3 This is a schematic diagram of the oil circuit of the working roll in the utility model;
[0016] In the figure, 1, thrust bearing; 2, thrust bearing seat; 2-1, thrust bearing seat 1; 2-2, thrust bearing seat 2; 3, lower rolling mill door; 4, lower archway; 5-1, upper lubricating oil pipe; 5-2, lower lubricating oil pipe; 6, spray head; 7-1, upper oil spray guide plate oil inlet pipe; 7-2, lower oil spray guide plate oil inlet pipe; 8, working roll. DETAILED DESCRIPTION
[0017] The utility model is further described below in conjunction with the embodiments and drawings: Example
[0018] The working roll thrust mechanism is applied to a cold rolling mill with a model of SFC20H406*1625mm.
[0019] Working roll thrust mechanism, such as Figure 1 As shown, it includes a thrust bearing 1, a thrust bearing seat 2, and an oil injection cooling and lubrication device; the thrust bearing 1 is arranged on the thrust bearing seat 2, and the thrust bearing seat 2 is E-shaped as a whole, including a thrust bearing seat 1 2-1 and a thrust bearing seat 2-2, the thrust bearing seat 1 2-1 is fixed on the lower rolling mill door 3 on the operating side of the rolling mill, and the thrust bearing seat 2-2 is fixed on the lower arch 4 on the transmission side. The upper and lower supporting surfaces of the thrust bearing seat 1 2-1 and the thrust bearing seat 2-2 are arranged asymmetrically, as shown in FIG. Figure 2 As shown, the thickness difference between the upper and lower supporting surfaces is the horizontal height difference between the thrust bearing seat 1 2-1 and the thrust bearing seat 2-2, one side is 12mm thick and the other side is 7mm thick. During installation, the thrust bearing seat 1 2-1 and the thrust bearing seat 2-2 are installed upside down 180°, that is, the 12mm thick supporting surface of the thrust bearing seat 1 2-1 on the operating side of the rolling mill faces downward, and the 7mm thick supporting surface of the thrust bearing seat 2-2 on the transmission side of the rolling mill faces downward. This ensures that after the thrust bearing 1 is installed, the positions of the thrust bearings 1-1 and the thrust bearings 1-2 on both sides remain in the same horizontal plane, and the positions of the thrust bearings 1-3 and the thrust bearings 1-4 remain in the same horizontal plane, so that the unit pressure of the working rolls 8 borne by the thrust bearings 1 on both sides during rolling is the same, thereby avoiding the rolling of the working rolls 8 of the rolling mill.
[0020] The oil spray cooling lubrication device comprises an upper lubricating oil pipe 5-1, a lower lubricating oil pipe 5-2 and a plurality of spray heads 6, such as Figure 1 As shown, two nozzles with a diameter of 10 mm are arranged at the contact parts of the four thrust bearings and the roller heads, and the nozzles are connected to the upper oil injection guide plate oil inlet pipe 7-1 and the lower oil injection guide plate oil inlet pipe 7-2 of the rolling mill cooling system through the upper lubricating oil pipe 5-1 and the lower lubricating oil pipe 5-2, as shown in FIG. Figure 3 As shown in the figure, the designed cooling oil flow rate is 440L / min, which is sprayed directly to the contact surface of the thrust bearing and the roller head at a close distance. The specific cooling oil flow distribution is: 4 nozzles with 70L / min and 30L / min are added to the contact surface of the working roll and the thrust bearing on the operating side, with a total cooling flow rate of 200L / min. 6 nozzles with 20L / min flow rate and 4 nozzles with 30L / min flow rate are added to the contact surface of the working roll and the thrust bearing on the transmission side, with a total cooling flow rate of 240L / min.
Claims
1. A four-column twenty-high rolling mill work roll thrust mechanism, characterized in that: It includes a thrust bearing, a thrust bearing seat and an oil injection cooling and lubrication device; the thrust bearing is arranged on the thrust bearing seat, the thrust bearing seat is E-shaped as a whole, and includes a thrust bearing seat 1 and a thrust bearing seat 2, the thrust bearing seat 1 is fixed on the operating side of the rolling mill, and the thrust bearing seat 2 is fixed on the transmission side of the rolling mill, the upper and lower supporting surface thicknesses of the thrust bearing seat 1 and the thrust bearing seat 2 are arranged asymmetrically, the difference in thickness of the upper and lower supporting surfaces is the horizontal height difference between the thrust bearing seat 1 and the thrust bearing seat 2, and the thrust bearing seat 1 and the thrust bearing seat 2 are installed upside down 180°.
2. A four-column twenty-high rolling mill working roll thrust mechanism according to claim 1, characterized in that: The oil spray cooling lubrication device includes a lubricating oil pipe and a nozzle. The nozzles are respectively arranged on both sides of the contact part between each thrust bearing and the roller head. The nozzles are connected to the oil inlet pipe of the oil spray guide plate of the rolling mill cooling system through the lubricating oil pipe.