A structure device for suppressing vibration of a tandem cold mill and a control method thereof

Abstract

The application discloses a structure device for inhibiting vibration of a cold continuous rolling mill and a control method thereof, and belongs to the technical field of rolling mill vibration control. The application comprises a working roller, an intermediate roller and a supporting roller, both sides of the supporting roller are provided with bearing seat assemblies; the bearing seat assembly is composed of a bearing seat body, a pressure bearing positioning backing plate, a height increasing device, end cover fixing bolts and bearing end covers, and the bottom of the height increasing device is provided with a main hydraulic cylinder. The application can effectively reduce the extension stroke of the push rod of the main hydraulic cylinder, ensure that the maximum extension position is not more than 200 mm, avoid the inherent frequency of roller system rotation being similar to the characteristic frequency interval of the hydraulic system, thus inducing rolling mill vibration to affect equipment and product quality, solve the technical problem that the supporting roller is scrapped without being used to the minimum diameter in the prior art, and reasonably control the roller consumption cost.

Description

Technical Field

[0001] This invention relates to the field of rolling mill vibration control technology, and more specifically, to a structural device and control method for suppressing vibration of a cold continuous rolling mill. Background Technology

[0002] Rolls (support rolls, intermediate rolls, work rolls) are consumables in production. After a certain period of use, they need to be re-ground and reused. After grinding, the diameter of the rolls will continuously decrease. This will cause the extension stroke length H of the main hydraulic cylinder push rod in the hydraulic pressing control system to continuously increase during the process of raising the roll system to the rolling centerline, in order to offset the decrease in roll diameter. The extension stroke length H of the main hydraulic cylinder push rod is affected by factors including: the initial amount h... c Change in support roller diameter h b Change in intermediate roller diameter h i Change in working roll diameter h w Influenced by various changing factors, the PLC program control system, taking into account the above changes, further executes the stroke calculation formula: H = h c +1 / 2*h b +h i +h w Automatic positioning control of the rolling centerline is implemented.

[0003] The change in the roller system diameter is compensated by the extension stroke length H of the main hydraulic cylinder push rod to maintain the constant height of the rolling centerline. In actual production, the roller system diameter is random, and its variation depends on the diameters of the support roller, intermediate roller, and work roller, and is inversely proportional to the extension stroke length H of the main hydraulic cylinder push rod: the larger the sum of the diameters of the three, the smaller the extension stroke length H; the smaller the sum of the diameters of the three, the larger the extension stroke length H. Theoretically, when the diameters of the support roller, intermediate roller, and work roller are all at their maximum values, the extension stroke length H of the push rod is the smallest; when the diameters of the support roller, intermediate roller, and work roller are all at their minimum values, the extension stroke length H of the push rod is the largest.

[0004] However, the actual production process presents several problems: After repeated use and grinding, the diameter of the rolls continuously decreases, while the extension stroke length H continuously increases. When the extension stroke length H of the main hydraulic cylinder push rod in any stand exceeds 200mm, the fluid volume in the rodless chamber of the cylinder will create hydraulic pressure fluctuations, which are further transmitted to the servo valve core, generating characteristic frequency chatter. Furthermore, when the mill speed increases to over 400 m / min, the natural frequency of the roll system enters a range close to this characteristic frequency. When the two frequencies coincide, resonance is induced in the mill, manifesting as mill vibration. Mill vibration not only shortens equipment lifespan and leads to more significant equipment failures, but the vibration energy transmitted to the strip surface also forms vibration marks, causing product quality defects.

[0005] Taking a 1720mm fully continuous four-stand UCM six-high cold rolling mill as an example, this paper specifically explains the change in the extension stroke length H of the main hydraulic cylinder push rod when the roll system diameter changes. The roll system of this mill consists of work rolls, intermediate rolls, and support rolls, and the specific roll system diameters are as follows:

[0006] Work rolls: Maximum Φ425mm; Minimum Φ385mm

[0007] Intermediate roller: Maximum Φ490mm; Minimum Φ440mm

[0008] Support rollers: Maximum Φ1300mm; Minimum Φ1150mm

[0009] Table 1: Calculation Table of Corresponding Frame Roller System Variation and Main Hydraulic Cylinder Push Rod Extension Stroke Length H

[0010]

[0011] Therefore, according to the compensation adjustment calculation method of the extension stroke length H of the main hydraulic cylinder push rod, theoretically the value of H varies between 65mm and 230mm, that is, it changes randomly within the range of the maximum and minimum roller system diameter limits.

[0012] To prevent the main hydraulic cylinder push rod extension stroke length H from exceeding 200mm in height, which would cause the natural frequency of the roll system rotation to be close to the characteristic frequency range of the hydraulic system and induce vibration in the rolling mill, it is necessary to pre-calculate the stroke length H of the roll system diameter for each stand before use. For those exceeding 200mm in height, a larger roll diameter should be reconfigured to prevent excessive adjustment compensation for the main hydraulic cylinder push rod extension stroke length H.

[0013] Existing technologies for controlling the extension stroke length of the main hydraulic cylinder push rod have the following problems: Before changing rolls in the rolling mill, the stroke length of the main hydraulic cylinder needs to be pre-calculated for the roll system of each stand in order to solve the problem of excessive extension stroke length by configuring larger rolls. This causes inconvenience for roll matching between grinding rolls; it also leads to the scrapping of support rolls before the minimum diameter is used, increasing roll consumption costs; controlling the rolling speed to not exceed 400 m / min is necessary to avoid the characteristic frequency of the hydraulic pressing system being close to the rotation frequency of the rolling mill stand, which could trigger resonance and affect production efficiency.

[0014] Through searching, relevant patents in the prior art suppress mill vibration by methods such as reducing bearing housing clearance in the design of mill vibration suppression devices, optimizing tension regime, setting reduction schedule, setting independent hydraulic vibration suppression mechanisms, reducing finishing mill load, and reverse phase control. These differ significantly in technical features from the present invention's design of a novel support roll bearing housing structure and rolling centerline adjustment control method to reduce the lifting height of the main hydraulic cylinder and suppress vibration. Summary of the Invention

[0015] 1. The technical problem that the invention aims to solve

[0016] To address the shortcomings and deficiencies of existing technologies, this invention provides a structural device and control method for suppressing vibration in cold continuous rolling mills. This invention can effectively reduce the extension stroke of the main hydraulic cylinder push rod, ensuring that the maximum extension position does not exceed 200mm, thus avoiding the natural frequency of the roll system rotation being close to the characteristic frequency range of the hydraulic system, which would induce mill vibration and affect equipment and product quality. At the same time, it solves the technical problem in existing technologies where support rolls are scrapped before reaching their minimum diameter, and reasonably controls roll consumption costs.

[0017] 2. Technical Solution

[0018] To achieve the above objectives, the technical solution provided by this invention is as follows:

[0019] The present invention provides a structural device for suppressing vibration of a cold rolling mill, comprising a work roll, an intermediate roll, and a support roll, wherein the work roll, the intermediate roll, and the support roll are arranged in sequence, and bearing housing assemblies are provided on both sides of the support roll;

[0020] The bearing housing assembly consists of a bearing housing body, a pressure-bearing positioning pad, a heightening device, end cap fixing bolts, and a bearing end cap. The bearing end cap is assembled to the bearing housing body by the end cap fixing bolts. A pressure-bearing positioning pad is provided at the bottom of the bearing housing body. A heightening device is provided on the bottom surface of the pressure-bearing positioning pad. A main hydraulic cylinder is provided at the bottom of the heightening device.

[0021] Furthermore, the height-increasing device is detachably assembled with the pressure-bearing positioning pad via height-increasing device fixing screws.

[0022] Furthermore, the length, width, and height dimensions of the height-increasing device are 700*280*30.

[0023] Furthermore, the pressure-bearing positioning pad and the center of the heightening device are respectively set on the same vertical line.

[0024] Furthermore, the work roll, intermediate roll, and support roll are arranged in pairs along the rolling center line, and the support roll includes an upper support roll and a lower support roll, with the bearing housing assembly arranged on both sides of the lower support roll.

[0025] A structural device for suppressing vibration of a cold rolling mill, comprising the following steps.

[0026] Step 1: Install a fixed heightening device at the bottom of the bearing housing of the lower support roller. The bearing housings on both sides of the lower support roller adopt the same structural design.

[0027] Step 2: Measure the diameter of the lower support roller and select the appropriate bearing housing according to the judgment rules. If the diameter of the lower support roller is in the range of 1150mm≤φ≤1240mm, then assemble the bearing housing assembly with the heightening device. If the diameter of the lower support roller is in the range of 1240mm<φ≤1300mm, then assemble the bearing housing of the original design.

[0028] Step 3: For support rolls without heightening devices installed on the bearing housing, execute the rolling centerline positioning calculation program: H2 = h c +1 / 2*h b +h i +h w For support rolls with bearing housing assemblies equipped with height-increasing devices, execute the rolling centerline positioning calculation program: H1 = (h c -30)+1 / 2*h b +h i +h w ;

[0029] Step 4: Based on the calculated H, determine whether an elevation device is needed, and further select the corresponding bearing housing. Then execute the corresponding PLC control program to implement automatic positioning control of the rolling centerline. By reducing the extension stroke of the main hydraulic cylinder push rod, the maximum extension position is prevented from exceeding 200mm, which could induce mill vibration.

[0030] 3. Beneficial effects

[0031] Compared with the prior art, the technical solution provided by this invention has the following advantages:

[0032] This invention can effectively reduce the extension stroke of the main hydraulic cylinder push rod, ensuring that the maximum extension position does not exceed 200mm, thus avoiding the natural frequency of the roller system rotation being close to the characteristic frequency range of the hydraulic system, which would induce mill vibration and affect equipment and product quality. At the same time, it solves the technical problem in the prior art where the support roller is scrapped before the minimum diameter is used, and reasonably controls the roller consumption cost. Attached Figure Description

[0033] Figure 1 This is a structural diagram of the rolling mill roll system of the present invention;

[0034] Figure 2 This is a schematic diagram showing the diameter variation of the roller system according to the present invention;

[0035] Figure 3 This is a structural diagram of the bearing housing assembly of the present invention;

[0036] Figure 4 This is a bottom structural diagram of the bearing housing assembly of the present invention;

[0037] Figure 5 This is a structural diagram of a conventional bearing housing according to the present invention;

[0038] Figure 6 This is a structural diagram of the bottom surface of a conventional bearing housing according to the present invention;

[0039] Figure 7 This is a flowchart illustrating the rolling centerline adjustment process of the present invention.

[0040] In the diagram: 1. Working roll; 2. Intermediate roll; 3. Support roll; 4. Bearing housing assembly; 401. Bearing housing body; 402. Pressure-bearing positioning pad; 403. Heightening device; 404. Bearing end cover; 405. Bearing end cover; 406. Heightening device fixing screw; 5. Main hydraulic cylinder. Detailed Implementation

[0041] The present invention will be further described below with reference to the accompanying drawings and embodiments:

[0042] Example 1

[0043] from Figure 1-7 As can be seen, the structural device for suppressing vibration of a cold rolling mill in this embodiment includes a work roll 1, an intermediate roll 2 and a support roll 3. The work roll 1, the intermediate roll 2 and the support roll 3 are arranged in sequence, and bearing housing assemblies 4 are provided on both sides of the support roll 3.

[0044] The bearing housing assembly 4 consists of a bearing housing body 401, a pressure-bearing positioning pad 402, a heightening device 403, an end cap fixing bolt 404, and a bearing end cap 405. The bearing end cap 405 is assembled with the bearing housing body 401 by the end cap fixing bolt 404. The bearing housing body 401 is provided with a pressure-bearing positioning pad 402 at the bottom. The pressure-bearing positioning pad 402 is provided with a heightening device 403 on the bottom surface. The heightening device 403 is provided with a main hydraulic cylinder 5 at the bottom.

[0045] The height-increasing device 403 is detachably assembled with the pressure-bearing positioning pad 402 via the height-increasing device fixing screw 406.

[0046] The length, width and height dimensions of the height-increasing device 403 are 700*280*30.

[0047] The center of the pressure-bearing positioning pad 402 and the center of the raising device 403 are set on the same vertical line.

[0048] The work roll 1, intermediate roll 2 and support roll 3 are arranged in pairs along the rolling center line. The support roll 3 includes an upper support roll and a lower support roll. The bearing housing assembly 4 is arranged on both sides of the lower support roll.

[0049] A structural device for suppressing vibration of a cold rolling mill, comprising the following steps.

[0050] Step 1: Install the fixing and raising device 403 at the bottom of the bearing seat 401 of the lower support roller. The bearing seats on both sides of the lower support roller adopt the same structural design.

[0051] Step 2: Measure the diameter of the lower support roller and select the appropriate bearing housing according to the judgment rules. If the diameter of the lower support roller is in the range of 1150mm≤φ≤1240mm, then assemble the bearing housing assembly 4 with the heightening device 403. If the diameter of the lower support roller is in the range of 1240mm<φ≤1300mm, then assemble the bearing housing of the original design.

[0052] Step 3: For support rolls without heightening devices installed on the bearing housing, execute the rolling centerline positioning calculation program: H2 = h c +1 / 2*h b +h i +h w For the support roll of the bearing housing assembly 4 with the heightening device 403, execute the rolling centerline positioning calculation program: H1 = (h c -30)+1 / 2*h b +h i +h w ;

[0053] Step 4: Based on the calculated H, determine whether the height-increasing device 403 is needed, and further select the corresponding bearing housing. Then execute the corresponding PLC control program to implement automatic positioning control of the rolling centerline. By reducing the extension stroke of the main hydraulic cylinder 5 push rod, the maximum extension position is prevented from exceeding 200mm, which could induce mill vibration.

[0054] This invention designs a novel support roller bearing seat structure and a rolling centerline adjustment and control method to ensure that the extension stroke length of the main hydraulic cylinder push rod is not affected by the reduction of the roller system diameter, and always remains within a reliable stroke range. This avoids the high precision requirements of the hydraulic control system for equipment functions under extreme conditions, and achieves the goal of continuous and stable rolling.

[0055] The lower support roller bearing housing is designed with a raised block structure at the bottom. The height of the raised block device reduces the stroke length h between the main hydraulic cylinder push rod and the bearing housing. c This ensures that after the diameter of the roller system is reduced, the stroke length of the main hydraulic cylinder push rod extension can be within a safe and reliable working range.

[0056] Roll diameter data determination rules: Design a roll diameter calculation model, pre-calculate and verify the diameter of the support rolls used on the production line, and determine the change in the diameter h of the support rolls. b Select the appropriate bearing housing and execute the corresponding rolling centerline positioning calculation program to avoid the compensation amount exceeding the mechanical limit.

[0057] This invention designs a heightening device on the support roll bearing seat body. This device is installed and fixed at the bottom position of the lower support roll bearing seat. The bearing seats at both the operating side and the transmission side adopt the same design device. Furthermore, the invention designs a roll diameter data determination rule in the roll data system, selects and assembles the corresponding bearing seat according to the support roll diameter, and executes the corresponding rolling centerline positioning calculation program.

[0058] This invention involves installing a heightening device at the bottom of the lower support roller bearing seat. This device is a metal structural component, fixed to the pressure-bearing positioning pad by screw holes, and becomes an integral part with the bearing seat. Specific dimensions, location, and technical requirements are as follows: Figure 3-4 As shown; moreover, the bearing seats used to assemble the support rolls on both sides adopt the same structural design; in particular, in the structural device, the main hydraulic cylinder push rod is in contact with the heightening device to further transmit the rolling force.

[0059] The height adjustment device installed on this unit has a compensation height of 30mm based on the structure of the main hydraulic cylinder and the support roller bearing seat (the compensation height can be designed for each unit according to the characteristics of different equipment).

[0060] Before assembling the support roll, its diameter is measured. Based on the support roll diameter, a corresponding bearing housing is selected (two types: the original design bearing housing and the newly designed bearing housing with a height-increasing device), as shown in Figure 5: Original bearing housing design schematic. If the diameter change of the lower support roll after grinding is greater than 60mm, then the bearing housing with the height-increasing device can be selected. Furthermore, the diameter of the lower support roll used on the production line is pre-calculated and verified. Based on the diameter change hb of the support roll, the appropriate bearing housing is selected, and the corresponding rolling centerline positioning calculation program is executed.

[0061] To further explain, the control method for the rolling centerline positioning calculation program is as follows:

[0062] a. The bearing housing adopts the original design.

[0063] The lower support roller bearing housing structure adopts the original design, and the main hydraulic cylinder push rod extends from the initial position to an initial height h that contacts the bottom of the lower support roller bearing housing. c The PLC program control system executes the calculation formula for a length of 65mm:

[0064] H = h c +1 / 2*h b +h i +h w Implement automatic positioning control for the rolling centerline.

[0065] b. The bearing housing adopts a height-increasing design.

[0066] A heightening device is installed at the bottom of the lower support roller bearing housing, and the main hydraulic cylinder push rod extends from the initial position to the lower support roller.

[0067] Initial height h of the bearing housing bottom contact c The height is lowered to 35mm. To prevent the main hydraulic cylinder push rod from rising beyond the mechanical limit, the PLC program control system executes the calculation formula:

[0068] H=(h c -30)+1 / 2*h b +h i +h w Implement automatic positioning control of rolling centerline

[0069] H = h c +1 / 2*h b +h i +h w Formula for calculating the extension stroke length H of the main hydraulic cylinder push rod

[0070] Where: h c —The initial stroke length of the main hydraulic cylinder push rod varies depending on the type and structure of the support roll bearing housing and the main hydraulic cylinder used in different continuous rolling mills. c They are also different; for example, the initial stroke length h of the main hydraulic cylinder push rod of this unit is different. c It is 65mm;

[0071] h b —The change in the diameter of the support roller, which is the difference between the maximum diameter of the support roller (φ1300mm) and the actual diameter used;

[0072] h i —The change in the diameter of the intermediate roll, which is the difference between the maximum diameter of the intermediate roll (φ490mm) and the actual diameter used;

[0073] h w —The variation in the working roll diameter, the difference between the maximum diameter (φ425mm) and the actual diameter used.

[0074] In the specific embodiments, the F1 first frame is used as an example, and the diameters of the working rolls and intermediate rolls are based on the minimum roll diameter. (The implementation methods for other frames are exactly the same).

[0075] Figure 2 In the diagram, ① represents the change in h when the working roll has its minimum diameter (Φ385mm). w

[0076] ②—This represents the change in h when the working roll has its maximum diameter (Φ425mm). w

[0077] ③ — This represents the change in h when the intermediate roller has its minimum diameter (Φ440mm).i

[0078] ④ — This represents the change in h when the intermediate roller has its maximum diameter (Φ490mm). i

[0079] ⑤ — This represents the change in h when the support roller has its minimum diameter (Φ1150mm). b

[0080] ⑥—This represents the change in h when the support roller has its maximum diameter (Φ1300mm). b

[0081] Taking a 1720mm fully continuous four-stand UCM six-high cold rolling mill as an example, this paper specifically explains the change in the extension stroke length H of the main hydraulic cylinder push rod when the roll system diameter changes. The roll system of this mill consists of work rolls, intermediate rolls, and support rolls, and the specific roll system diameters are as follows:

[0082] Work rolls: Maximum Φ425mm; Minimum Φ385mm

[0083] Intermediate roller: Maximum Φ490mm; Minimum Φ440mm

[0084] Support rollers: Maximum Φ1300mm; Minimum Φ1150mm

[0085] Example 1: The diameter of the lower support roller F1 is φ = 1275 mm;

[0086] 1. Work roll diameter φ = 385mm, intermediate roll diameter φ = 440mm

[0087] The change in the diameter h of the support roller is calculated using the formula in Table 1. b =1300-1275=25mm

[0088] Change in intermediate roller diameter h i =490-440=50

[0089] Change in working roll diameter h W =425-385=40

[0090] Extension stroke length of the main hydraulic cylinder push rod of F1 frame:

[0091] H = h c +1 / 2*h b +h i +h w =65+1 / 2*25+50+40=167.5mm,

[0092] If the extension stroke length H = 167.5mm < 200mm, then the bearing housing without the heightening device is installed.

[0093] 2. Since the bearing housing of the support roller assembly does not have a heightening device installed, the rolling centerline positioning calculation procedure should be executed:

[0094] H = h c +1 / 2*h b +h i +h w

[0095] Example 2: The diameter of the lower support roller F1 is φ = 1250 mm;

[0096] 1. Work roll diameter φ = 385mm, intermediate roll diameter φ = 440mm

[0097] The change in the diameter h of the support roller is calculated using the formula in Table 1. b =1300-1250=50mm

[0098] Change in intermediate roller diameter h i =490-440=50

[0099] Change in working roll diameter h W =425-385=40

[0100] Extension stroke length of the main hydraulic cylinder push rod of F1 frame:

[0101] H = h c +1 / 2*h b +h i +h w =65 + 1 / 2 * 50 + 50 + 40 = 180mm

[0102] If the extension stroke length H = 180mm < 200mm, then the bearing housing without the heightening device is installed.

[0103] 2. Since the bearing housing of the support roller assembly does not have a heightening device installed, the rolling centerline positioning calculation procedure should be executed:

[0104] H = h c +1 / 2*h b +h i +h w

[0105] Example 3: The diameter of the lower support roller F1 is φ = 1208 mm;

[0106] 1. Work roll diameter φ = 385mm, intermediate roll diameter φ = 440mm

[0107] The change in the diameter h of the support roller is calculated using the formula in Table 1. b =1300-1208=92mm

[0108] Change in intermediate roller diameter hi =490-440=50

[0109] Change in working roll diameter h W =425-385=40

[0110] Extension stroke length of the main hydraulic cylinder push rod of F1 frame:

[0111] H = h c +1 / 2*h b +h i +h w =65 + 1 / 2 * 92 + 50 + 40 = 201 mm

[0112] If the extension stroke length H = 201mm > 200mm, then assemble a bearing housing with a heightening device.

[0113] 2. Since the bearing housing of the support roller assembly is equipped with a heightening device, the rolling centerline positioning calculation procedure shall be executed:

[0114] H=(h c -30)+1 / 2*h b +h i +h w

[0115] Example 4: The diameter of the lower support roller F1 is φ = 1160 mm;

[0116] 1. Work roll diameter φ = 385mm, intermediate roll diameter φ = 440mm

[0117] The change in the diameter h of the support roller is calculated using the formula in Table 1. b =1300-1160=140mm

[0118] Change in intermediate roller diameter h i =490-440=50

[0119] Change in working roll diameter h W =425-385=40

[0120] Extension stroke length of the main hydraulic cylinder push rod of F1 frame:

[0121] H = h c +1 / 2*h b +h i +h w =65+1 / 2*150+50+40=225mm,

[0122] If the extension stroke length H = 225mm > 200mm, then assemble a bearing housing with a heightening device.

[0123] 2. Since the bearing housing of the support roller assembly is equipped with a heightening device, the rolling centerline positioning calculation procedure shall be executed:

[0124] H=(h c -30)+1 / 2*h b +h i +h w

[0125] The height-increasing device installed on this unit has a compensation height of 30mm based on the structure design of the main hydraulic cylinder and the support roller bearing seat. Any method that reduces the rising height of the main hydraulic cylinder and suppresses mill vibration by changing the bearing seat structure falls under the scope of this invention.

[0126] This invention employs a novel support roll bearing seat structure and a rolling centerline adjustment control method. It can pre-calculate and verify the change in roll diameter to determine the working state of the main hydraulic cylinder. Furthermore, through the bearing seat structure design, it effectively reduces the extension length of the main hydraulic cylinder push rod, ensuring that it always operates within a reliable stroke range. This avoids the high-precision requirements of the hydraulic control system under extreme conditions, thereby suppressing mill vibration and achieving continuous and stable rolling.

[0127] This invention can effectively reduce the extension stroke of the main hydraulic cylinder push rod, ensuring that the maximum extension position does not exceed 200mm, thus avoiding the natural frequency of the roller system rotation being close to the characteristic frequency range of the hydraulic system, which would induce mill vibration and affect equipment and product quality. At the same time, it solves the technical problem in the prior art where the support roller is scrapped before the minimum diameter is used, and reasonably controls the roller consumption cost.

[0128] The present invention and its embodiments have been described above illustratively. This description is not restrictive, and the figures shown are only one embodiment of the present invention; the actual structure is not limited thereto. Therefore, if those skilled in the art are inspired by this description and design similar structures and embodiments without departing from the spirit of the present invention, such designs should fall within the protection scope of the present invention.

Claims

1. A control method for a structural device for suppressing vibration of a cold rolling mill, the device comprising a work roll (1), an intermediate roll (2), and a support roll (3), characterized in that: The working roller (1), intermediate roller (2) and support roller (3) are arranged in sequence, and bearing housing assemblies (4) are provided on both sides of the support roller (3). The bearing housing assembly (4) consists of a bearing housing body (401), a pressure-bearing positioning pad (402), a heightening device (403), an end cap fixing bolt (404), and a bearing end cap (405). The bearing end cap (405) is assembled with the bearing housing body (401) by the end cap fixing bolt (404). The bearing housing body (401) is provided with a pressure-bearing positioning pad (402) at the bottom. The pressure-bearing positioning pad (402) is provided with a heightening device (403) on the bottom surface of the pressure-bearing positioning pad (402). The heightening device (403) is provided with a main hydraulic cylinder (5) at the bottom of the heightening device (403). The length, width and height dimensions of the height-increasing device (403) are 700mm*280mm*30mm; The center of the pressure-bearing positioning pad (402) and the center of the heightening device (403) are respectively set on the same vertical line; Its control method, the steps are as follows: Step 1: Install a fixed heightening device (403) at the bottom of the bearing housing (401) of the lower support roller. The bearing housings on both sides of the lower support roller adopt the same structural design. Step 2: Measure the diameter of the lower support roller and select the appropriate bearing housing according to the judgment rules. If the diameter of the lower support roller is in the range of 1150mm≤φ≤1240mm, then assemble the bearing housing assembly (4) with the heightening device (403). If the diameter of the lower support roller is in the range of 1240mm<φ≤1300mm, then assemble the bearing housing of the original design. Step 3: For support rolls without heightening devices installed on the bearing housing, execute the rolling centerline positioning calculation program: H=h c +1 / 2*h b +h i +h w For the support roll of the bearing housing assembly (4) with the heightening device (403) installed, the rolling centerline positioning calculation program is executed: H = (h c -30) + 1 / 2 * h b +h i +h w ; Where: h c —The initial stroke length of the main hydraulic cylinder push rod; h b —Change in the diameter of the support roller; h i —Change in the diameter of the intermediate roller; h w —Change in the diameter of the working roll; Step 4: Based on the calculated H, determine whether a height-increasing device (403) is needed, and further select the corresponding bearing housing. Then execute the corresponding PLC control program to implement automatic positioning control of the rolling center line. By reducing the extension stroke of the main hydraulic cylinder (5) push rod, avoid the maximum extension position from exceeding 200mm, which may induce mill vibration.

2. The control method for a structural device for suppressing vibration of a cold rolling mill according to claim 1, characterized in that: The height-increasing device (403) is detachably assembled with the pressure-bearing positioning pad (402) via the height-increasing device fixing screw (406).

3. The control method for a structural device for suppressing vibration of a cold rolling mill according to claim 1, characterized in that: The work roll (1), intermediate roll (2) and support roll (3) are arranged in pairs along the rolling center line. The support roll (3) includes an upper support roll and a lower support roll. The bearing housing assembly (4) is arranged on both sides of the lower support roll.

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