Finish rolling descaling box roller way device

Abstract

The utility model discloses a finish rolling descaling box roller way device, and belongs to the technical field of steel rolling equipment. The device comprises an inlet upper and lower pinch roller way, a 1 # middle roller way, a 2 # middle roller way, an outlet upper and lower pinch roller way and an inlet and outlet pinch roller pressing hydraulic cylinder, the roller ways are fixedly connected with bearing seats, and the bearing seats connected with the two ends of the inlet upper and lower pinch roller way, the 1 # middle roller way, the 2 # middle roller way and the outlet upper and lower pinch roller way are center offset bearing seats. The offset directions of the bearing seats connected to the two ends of the same roller way are opposite, and the offset distance between each bearing seat and the axis of the roller way is 8 mm; the size of the outer side of a bearing seat connected with the inlet up-and-down pinch roller way and the outlet up-and-down pinch roller way is reduced, and the gap between the bearing seat and the memorial archway slideway copper sliding plate is 4 mm. According to the device provided by the utility model, steel scrap rolling and fault time are avoided, and meanwhile, the on-line service time of the working roll of the vertical rolling mill at the inlet of the finishing mill is prolonged.

Description

Technical Field

[0001] This utility model relates to a descaling box roller conveyor device for fine rolling, belonging to the technical field of steel rolling equipment. Background Technology

[0002] The finishing mill descaling box is a crucial piece of equipment in a hot rolling production line. Its main function is to remove secondary iron oxide scale from the surface of the strip using high-pressure water. The finishing mill descaling box mainly consists of inlet upper and lower pinch roller conveyors, #1 and #2 intermediate roller conveyors, outlet upper and lower pinch roller conveyors, and inlet and outlet pinch roller clamping hydraulic cylinders. During high-pressure water descaling, the front and rear pinch roller conveyors press down on the descaling water within the enclosed box, allowing the strip to be conveyed under pressure on the descaling box roller conveyors. The primary function of the finishing mill descaling box is to align the descaled strip with the rolling centerline and transport it into the finishing mill.

[0003] During the initial equipment maintenance, the axis of the finishing descaling box roller table was measured using the center line of the finishing mill stand as a reference. It was found that the stands on both sides of the finishing descaling box were misaligned. The problems are as follows: the installation axis of the inlet / outlet pinch rolls and intermediate rolls is not perpendicular to the rolling center line, with a misalignment of 18mm and an angle of 0.57°. When rolling carbon steel, the strip tends to deviate towards the mill drive side after passing through the finishing descaling box. This results in the pressure on the drive side of the small vertical roll at the finishing mill entrance of the hot strip mill production line being 80-100kN higher than that on the operating side. When the strip is descaled by high-pressure water, the front and rear pinch rollers press the strip tightly from top to bottom. At this time, the strip is conveyed by pressure on the descaling box roller. Due to the skew of the axis of the fine descaling roller (front and rear pinch rollers and intermediate roller), the strip enters the finishing mill at a skew angle of 0.57°. The strip often moves forward in an S-shape in the finishing mill. It is necessary to cross-adjust the pressure on one side through 7 finishing mills to correct the strip shape. This can easily cause the strip to deviate and become scrap steel in the mill.

[0004] Through comparative testing (using pinch rolls in the descaling box for carbon steel production, but not for stainless steel production), it was deduced that the skewed axis of the pinch rolls before and after descaling, and the intermediate rolls causing the strip to be conveyed obliquely, is the root cause of the "rolling deviation of carbon steel immediately after passing through the descaling box in the rolling mill." This "rolling deviation" of strip in the finishing mill has become a major and long-standing problem affecting on-site production. Therefore, there is an urgent need to provide a device to solve this problem. Utility Model Content

[0005] To address the issue of strip steel deviating towards the drive side after passing through the finishing descaling box roller conveyor, this invention provides a bearing housing for correcting the roller conveyor's axis. When the hot continuous rolling finishing descaling box roller conveyor is in a state where the axis is skewed due to the installation of stops on both sides, the axis is corrected and skewed by using the roller conveyor bearing housing.

[0006] Since the anchor bolts of the fine descaling box are pre-embedded bolts, the foundations of the two side arches of the fine descaling box are already fixed and cannot be moved. Under the existing equipment conditions, this utility model assembles the descaling box roller conveyor by designing "bearing seats that can correct the roller conveyor axis line". By using the reverse "center offset" of the bearing seats on both sides of the roller conveyor, the skewness of the axis line at the stop of the fine descaling arch roller conveyor is compensated. After the roller conveyor is assembled and installed on the machine, the abnormal problem of the axis line not being perpendicular to the rolling center line can be eliminated, the abnormal state of the equipment can be eliminated, and stable rolling production can be guaranteed.

[0007] The technical solution adopted in this utility model is:

[0008] A finishing mill descaling box roller conveyor device includes an inlet upper and lower pinch roller conveyor, a No. 1 intermediate roller conveyor, a No. 2 intermediate roller conveyor, an outlet upper and lower pinch roller conveyor, and inlet and outlet pinch roller clamping hydraulic cylinders. The roller conveyors are fixedly connected to bearing seats. The bearing seats connected to both ends of the inlet upper and lower pinch roller conveyor, the No. 1 intermediate roller conveyor, the No. 2 intermediate roller conveyor, and the outlet upper and lower pinch roller conveyor are all center-offset bearing seats. The offset directions of the bearing seats connected to the two ends of the same roller conveyor are opposite, and the offset distance between the bearing seat and the roller conveyor axis is 8mm. Furthermore, the outer dimensions of the bearing seats connected to the inlet and outlet upper and lower pinch roller conveyors are reduced, and the gap between the bearing seat and the copper sliding plate of the archway slide is 4mm. The copper sliding plate of the archway slide refers to the guide rail that restricts the movement of the bearing seat. The outer dimensions of the bearing seat of the intermediate roller conveyor remain unchanged, only the center is offset.

[0009] Specifically, the center of the bearing seat inner hole on the operating side of the inlet upper and lower clamping roller conveyor, the inlet and outlet upper and lower clamping roller conveyor, the No. 1 intermediate roller conveyor, and the No. 2 intermediate roller conveyor is horizontally offset by 8mm towards the inlet direction, and the center of the bearing seat inner hole on the transmission side of the inlet upper and lower clamping roller conveyor, the inlet and outlet upper and lower clamping roller conveyor, the No. 1 intermediate roller conveyor, and the No. 2 intermediate roller conveyor is horizontally offset by 8mm towards the outlet direction.

[0010] After the center holes of the bearing seats at both ends of the inlet and outlet pinch roller conveyors, No. 1 intermediate roller conveyor, and No. 2 intermediate roller conveyor are offset, the skewness of the pinch roller axis line can be corrected by 16mm. The skew angle is reduced from 0.57° to 0.02°. The 0.02° skew angle has no impact on stable rolling and can be ignored.

[0011] Specifically, the outer width of the bearing housing connecting the inlet and outlet upper and lower clamping roller conveyors has been reduced by 2mm, from the original 354mm to 352mm.

[0012] The beneficial effects of the precision mill descaling box roller conveyor device provided by this utility model are as follows:

[0013] The device provided by this utility model completely eliminates the production problem of "carbon steel immediately running off-center in the rolling mill after passing through the fine descaling box", avoiding the rolling of scrap steel and downtime, while extending the online service time of the work rolls of the vertical roll mill at the entrance of the fine rolling mill.

[0014] The present invention will be further described below with reference to the accompanying drawings and embodiments. Attached Figure Description

[0015] Figure 1 This is a schematic diagram of the arrangement of the descaling box roller conveyor of this utility model.

[0016] Figure 2 This is a schematic diagram of the bearing housing.

[0017] Figure 3 for Figure 2 A cross-sectional view along line AA.

[0018] Figure 4 for Figure 2 Top view.

[0019] In the diagram: 1. Front roller conveyor; 2. Inlet upper and lower pinch roller conveyor; 3. No. 1 intermediate roller conveyor; 4. No. 2 intermediate roller conveyor; 5. Outlet upper and lower pinch roller conveyor; 6. Center offset bearing housing; 7. Roller conveyor axis; 8. Center line of the inner hole of the offset bearing housing. Detailed Implementation

[0020] Example

[0021] like Figures 1-4 As shown, a finishing mill descaling box roller conveyor device includes an inlet upper and lower pinch roller conveyor 2, a No. 1 intermediate roller conveyor 3, a No. 2 intermediate roller conveyor 4, an outlet upper and lower pinch roller conveyor 5, and inlet and outlet pinch roller clamping hydraulic cylinders. The roller conveyors are fixedly connected to bearing seats. The bearing seats connected to both ends of the inlet upper and lower pinch roller conveyor 2, No. 1 intermediate roller conveyor 3, No. 2 intermediate roller conveyor 4, and outlet upper and lower pinch roller conveyor 5 are all center-offset bearing seats 6. The offset directions of the bearing seats connected to the two ends of the same roller conveyor are opposite, and the offset distance between the center-offset bearing seat 6 and the roller conveyor axis 7 is 8mm. Furthermore, the outer dimensions of the bearing seats connected to the inlet and outlet upper and lower pinch roller conveyors are reduced, and the gap between the bearing seat and the copper sliding plate of the archway slide is 4mm. The copper sliding plate of the archway slide refers to the guide rail that restricts the movement of the bearing seat. The outer dimensions of the bearing seat of the intermediate roller conveyor remain unchanged, only the center is offset.

[0022] Specifically, the center of the bearing seat inner hole on the operating side of the inlet upper and lower clamping roller conveyor, the inlet and outlet upper and lower clamping roller conveyor, the No. 1 intermediate roller conveyor, and the No. 2 intermediate roller conveyor is horizontally offset by 8mm towards the inlet direction, and the center of the bearing seat inner hole on the transmission side of the inlet upper and lower clamping roller conveyor, the inlet and outlet upper and lower clamping roller conveyor, the No. 1 intermediate roller conveyor, and the No. 2 intermediate roller conveyor is horizontally offset by 8mm towards the outlet direction.

[0023] After the center holes of the bearing seats at both ends of the inlet and outlet pinch roller conveyors, No. 1 intermediate roller conveyor, and No. 2 intermediate roller conveyor are offset, the skewness of the pinch roller axis line can be corrected by 16mm. The skew angle is reduced from 0.57° to 0.02°. The 0.02° skew angle has no impact on stable rolling and can be ignored.

[0024] Specifically, the outer width of the bearing housing connecting the inlet and outlet upper and lower clamping roller conveyors has been reduced by 2mm, from the original 354mm to 352mm.

[0025] Taking the inlet lower pinch roller bearing housing as an example, attached Figures 2-4 The structure of the bearing housing is shown.

[0026] The specific operating method is as follows:

[0027] By shifting the center of the bearing housing at both ends of the roller conveyor horizontally by 8mm towards the inlet and outlet directions, the offset of the bearing housing center hole can correct the skewness of the pinch roller shaft centerline by 16mm, and reduce the skew angle to 0.02°.

[0028] The outer width of the bearing housing was reduced by 3mm, and a gap of 4mm was reserved between the bearing housing and the copper slide plate of the archway. By adding or removing positioning slide shims to further adjust the center line of the pinch roller, the skew angle can be completely eliminated.

[0029] The mounting groove of the hydraulic cylinder fork head for pressing the upper pinch roller is designed on the symmetrical center line of the bearing seat, which can ensure that the bearing seat of the upper pinch roller and the cylinder fork head are smoothly aligned and installed to complete the lifting and lowering action of the upper pinch roller.

[0030] The 18mm skew of the centerline of the roller conveyor stop on the finishing descaling box is compensated by the reverse "center offset" of the bearing seats on both sides of the roller conveyor, eliminating the 0.57° skew angle of the centerline and making the centerline of the finishing descaling box roller conveyor perpendicular to the rolling centerline of the finishing mill. The strip can then enter the finishing mill aligned along the rolling centerline.

[0031] This utility model's "center-offset bearing seat" was installed and tested on a 2250mm hot strip mill production line, and the inlet upper and lower pinch roller conveyors were assembled. Before the equipment improvement, the pressure difference between the drive side and the operating side of the finishing vertical rolling mill's opening and closing cylinders after the strip passed through the descaling box could reach 30-60kN, and in severe cases, 80-100kN, indicating that the strip was biased towards the drive side. After being put into use, the pressure on the drive side of the finishing vertical rolling mill decreased to 60kN, and the strip's deviation towards the drive side was significantly improved. After 10 days of operation, the "center-offset bearing seat" was also used on the upper and lower pinch roller conveyors at the finishing descaling exit. After installation and use, the phenomenon of the strip deviating towards the drive side after passing through the descaling box was completely eliminated. Using the improved technical solution of this utility model, the pressure difference between the drive side and the operating side of the finishing vertical rolling mill's opening and closing cylinders after the strip passed through the descaling box was only 2kN, and the strip deviation was controlled. The online service life was extended from 3 months to 4.5 months.

Claims

1. A finishing mill descaling box roller conveyor device, comprising an inlet upper and lower pinch roller conveyor, a No. 1 intermediate roller conveyor, a No. 2 intermediate roller conveyor, an outlet upper and lower pinch roller conveyor, and an inlet and outlet pinch roller clamping hydraulic cylinder, wherein the roller conveyors are connected and fixed to bearing seats, characterized in that: The bearing seats connected to both ends of the inlet upper and lower clamping roller conveyors, No. 1 intermediate roller conveyor, No. 2 intermediate roller conveyor, and outlet upper and lower clamping roller conveyors are all center-offset bearing seats. The offset directions of the bearing seats connected to both ends of the same roller conveyor are opposite, and the offset distance between the bearing seat and the roller conveyor axis is 8mm. Furthermore, the outer dimensions of the bearing seats connected to the inlet upper and lower clamping roller conveyors and the outlet upper and lower clamping roller conveyors are reduced, and the gap between the bearing seat and the copper sliding plate of the archway slide is 4mm.

2. The finishing mill descaling box roller conveyor according to claim 1, characterized in that: The center of the bearing seat inner hole on the operating side of the inlet upper and lower pinch roller conveyor, the inlet and outlet upper and lower pinch roller conveyor, the No. 1 intermediate roller conveyor, and the No. 2 intermediate roller conveyor is horizontally offset by 8mm towards the inlet direction. The center of the bearing seat inner hole on the drive side of the inlet upper and lower pinch roller conveyor, the inlet and outlet upper and lower pinch roller conveyor, the No. 1 intermediate roller conveyor, and the No. 2 intermediate roller conveyor is horizontally offset by 8mm towards the outlet direction. After the center holes of the bearing seats at both ends of the inlet and outlet upper and lower pinch roller conveyor, the No. 1 intermediate roller conveyor, and the No. 2 intermediate roller conveyor are offset, the skewness of the pinch roller axis can be corrected by 16mm, and the skew angle is reduced from 0.57° to 0.02°.

3. The finishing mill descaling box roller conveyor according to claim 1, characterized in that: The outer width of the bearing housing connecting the inlet and outlet upper and lower clamping roller conveyors has been reduced by 2mm, from the original 354mm to 352mm.

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