Roller suspension mechanism of rolling mill and control method of roller suspension mechanism

Abstract

A roller suspension mechanism of a rolling mill and a control method of the roller suspension mechanism are characterized in that a roller system and a power system are arranged in the rolling mill, three rows of rollers are sequentially distributed on the roller system from top to bottom and comprise four supporting rollers, three second middle rollers and two first middle rollers, and the power system comprises a hydraulic oil cylinder and a telescopic sleeve rod. The hydraulic oil cylinder is provided with a secondary pressure control valve, one end of the telescopic sleeve rod is controlled through the hydraulic oil cylinder, the other end of the telescopic sleeve rod is provided with a connecting rod, and the other end of the connecting rod is connected with the second middle roller and the first middle roller, so that the hydraulic oil cylinder drives the second middle roller and the first middle roller to act. The power system drives the supporting rollers to transmit through the transmission mechanism, suspension of the two intermediate rollers is adjusted through a pressure control program, a high-pressure suspension state and a low-pressure suspension state are included, remote switching is carried out, and therefore the functions of prolonging the service life and reducing the maintenance cost are achieved.

Description

Technical Field

[0001] The present invention relates to the technical field of rolling mills, and particularly relates to a roll suspension mechanism of a rolling mill and a control method thereof. Background Art

[0002] A rolling mill is a device for realizing the metal rolling process, usually composed of rolls, a rolling mill housing, bearing seats, bearings, a built-in coiling or uncoiling platform, a base, a roll adjusting device, an upper roll balancing device, a roll changing device, etc. The metal is rolled by the rolls. The existing intermediate roll suspension mechanism is connected to the roll through a hydraulic cylinder connecting a hook with a bearing seat, and realizes the opening or closing function together with the roll system by switching the direction of the solenoid valve. The pressure control of the intermediate roll suspension mechanism is a first-level pressure control technology, that is, the pressure of the suspension mechanisms of the drive rolls and idler rolls cannot be increased or decreased at any time, and can only be realized by manual adjustment. In the normal rolling or roll gap opening state, the pressure is fixed and cannot be electronically controlled to decrease or increase.

[0003] The following problems exist in the prior art:

[0004] 1. During rolling, due to the action of the rolling force, the self-weight of the rolls in the upper roll system is balanced by the rolling force, and the hydraulic suspension force acting at both ends of the rolls causes a certain amount of eccentric load at the contact between the bearing seat and the roll end, resulting in the service life of the intermediate rolls in the upper roll system being generally only 12 days, which is 24 days shorter than that of the intermediate rolls in the lower roll system (36 days), and the service life of the upper intermediate rolls is only 1 / 3 of that of the lower intermediate rolls.

[0005] 2. When the abnormal wear of the upper intermediate roll suspension bearing is serious, the roll system will vibrate, and quality problems such as vibration marks will appear on the strip surface.

[0006] 3. When the abnormal wear of the upper intermediate roll suspension bearing is serious, the bearing will break and rub against the roll end, and in severe cases, safety risks such as fire hazards will occur.

[0007] 4. The short service life of the bearing will increase the consumption of spare parts such as bearings and bearing seats, and greatly increase the maintenance cost. Summary of the Invention

[0008] The primary object of the present invention is to provide a roll suspension mechanism of a rolling mill, in which the power system drives the roll system to operate in cooperation with the transmission mechanism, and increases the service life of the roll system, reduces the roll system vibration phenomenon, reduces wear, and reduces the maintenance cost.

[0009] Another object of the present invention is to provide a control method for a roll suspension mechanism of a rolling mill, which adjusts the suspension of the intermediate roll through a pressure control program, including a high-pressure suspension state and a low-pressure suspension state and performs remote switching, so as to achieve the functions of increasing the service life and reducing the maintenance cost.

[0010] The primary technical solution of the present invention is as follows: A roll suspension mechanism for a rolling mill, characterized in that it includes a roll system and a power system. The roll system and the power system are provided inside the rolling mill. The roll system has three rows of rolls arranged from top to bottom, including four backup rolls, three second intermediate rolls, and two first intermediate rolls. The power system includes a hydraulic cylinder and a telescopic sleeve rod. A secondary pressure control valve is provided on the hydraulic cylinder. One end of the telescopic sleeve rod is controlled by the hydraulic cylinder, and the other end of the telescopic sleeve rod is equipped with a connecting rod. The other end of the connecting rod is respectively connected to the second intermediate roll and the first intermediate roll, so as to realize the hydraulic cylinder driving the second intermediate roll and the first intermediate roll to act. The transmission mechanism includes gears installed on the outer sides of the two middle backup rolls. A toothed plate is provided on the connecting rod of the middle second intermediate roll. The inner sides of the two gears are meshed with the toothed plate, and the toothed plate and the gears are mutually driven.

[0011] Further improvement: The second intermediate roll is suspended and fixed by bearings, and motors are connected to the inner sides of the two second intermediate rolls on both sides through plum blossom joints and driven to rotate by the motors.

[0012] Further improvement: All the rolls of the roll system are mutually driven by the friction force generated after the pipe seams are closed.

[0013] Further improvement: The four backup rolls are provided with multi-point supports by using saddles and segmented bearings.

[0014] Further improvement: Working rolls are provided below the two first intermediate rolls, and multi-point supports are arranged in the length direction of the working rolls.

[0015] Finally, the bottom of the rolling mill is connected to a base for support.

[0016] Another technical solution of the present invention is: A control method for the roll suspension mechanism of the above rolling mill, characterized in that the secondary pressure control valve is controlled by a second intermediate roll suspension secondary pressure control program, so as to realize that when the roll gap is opened, the second intermediate roll suspension mechanism switches to the high-pressure suspension state, and when the rolling force reaches a certain value after the roll gap is closed, the second intermediate roll suspension mechanism switches to the low-pressure suspension state and a power control line reaches the high and low pressure remote switching of the electro-controlled secondary pressure control valve.

[0017] Compared with the prior art, the advantages of this product are as follows: The power system drives the roll system to operate through the cooperation of the transmission mechanism. The second intermediate roll and the first intermediate roll are driven by the power system, and the two middle backup rolls are driven by the transmission mechanism, reducing the lateral force of the second intermediate roll, not only enhancing the service life, but also reducing the maintenance cost and safety risks. Especially in combination with the gear and toothed plate matching structure, the mechanism is simplified, the power components are reduced, and the transmission is more stable and accurate. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 This is a front structure schematic diagram of the present invention.

[0019] Figure 2 This is a structure schematic diagram of the roll system.

[0020] Figure 3 This is a side view of the roll system.

[0021] Figure 4 This is a bottom view of the roll system.

[0022] Figure 5 This is a schematic diagram of the working process of the roll system.

[0023] 1. Rolling mill, 2. Roll system, 3. Base, 4. Power system, 5. Transmission mechanism, 6. Pressure control valve, 21. Backup roll, 22. Second intermediate roll, 23. First intermediate roll, 24. Work roll, 211. Backup roll saddle, 241. Work roll saddle, 41. Hydraulic cylinder, 42. Telescopic sleeve rod, 43. Connecting rod, 44. Tooth plate, 45. Gear. Specific embodiments

[0024] The following further describes in detail the embodiments of the present invention in combination with the drawings and examples. The following examples are used to illustrate the present invention, but cannot be used to limit the scope of the present invention. In the description of the present invention, unless otherwise specified, the meaning of "a plurality" is two or more; the terms "upper", "lower", "left", "right", "inner", "outer", "front end", "rear end", "head", "tail", etc. indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation to the present invention. In addition, the terms "first", "second", "third", etc. are only used for descriptive purposes and cannot be understood as indicating or implying relative importance.

[0025] In the description of the present invention, it should be noted that unless otherwise clearly defined and limited, the terms "connected" and "connected" should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be directly connected or indirectly connected through an intermediate medium. For those of ordinary skill in the art, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0026] The following further describes the present invention in detail in combination with the embodiments of the drawings.

[0027] According to Figures 1 to 5, a roll suspension mechanism for a rolling mill, characterized in that: it includes a rolling mill 1, a roll system 2, and a power system 4. The inside of the rolling mill 1 is provided with a roll system 2 and a power system 4. The roll system 4 is arranged in three rows of rolls from top to bottom, successively including four backup rolls 21, three second intermediate rolls 22, and two first intermediate rolls 23. The power system 4 includes a hydraulic cylinder 41 and a telescopic sleeve rod 42. A secondary pressure control valve 6 is provided on the hydraulic cylinder 41. One end of the telescopic sleeve rod 42 is controlled by the hydraulic cylinder 41, and the other end of the telescopic sleeve rod 42 is installed with a connecting rod 43. The other end of the connecting rod 43 is respectively connected to the second intermediate roll 22 and the first intermediate roll 23, so as to realize that the hydraulic oil 41 cylinder drives the second intermediate roll 22 and the first intermediate roll 23, and the power system 4 drives the two intermediate backup rolls 21 to drive through a transmission mechanism 5. The transmission mechanism 5 includes that gears 45 are installed on the outer sides of the two intermediate backup rolls 21, and a toothed plate 44 is provided on the connecting rod 43 of the middle second intermediate roll 22. The inner sides of the two gears 45 are meshed and connected with the toothed plate 44, and the toothed plate 44 and the gears 45 drive each other. The second intermediate roll 22 is suspended and fixed by bearings. The four backup rolls 22 are provided with multi-point supports by saddle seats and segmented bearings. The connecting rod 43 is driven to expand and contract by the hydraulic cylinder 41, so as to drive the two second intermediate rolls 22 on both sides to drop through the connecting rod 43, and drive the middle second intermediate roll 22 to move synchronously through the toothed plate 44 and the gears 45. A work roll 24 is arranged below the two first intermediate rolls 23. The work roll 24 is provided with a work roll saddle 241 with multi-point supports in the length direction, and the two outer backup rolls are provided with backup roll saddles 211 with multi-point supports in the length direction. The inner sides of the two second intermediate rolls 22 on both sides are connected with motors through plum blossom joints and are driven to rotate by the motors. All the rolls of the roll system 2 are driven by the friction force generated after the pipe seams are closed with each other. And the bottom of the rolling mill 1 is connected with a base 3 for support.

[0028] A control method for a roll suspension mechanism, characterized in that the secondary pressure control valve 6 is controlled by a second intermediate roll 22 suspension secondary pressure control program. Usually, a controller is used and this control program is loaded. The execution signal output end of the controller is connected to the secondary pressure control valve 6, and the sensor for detecting the roll pressure is connected to the detection signal input end of the controller. When the roll gap is opened, the second intermediate roll 22 suspension mechanism switches to the high-pressure suspension state. After the roll gap is closed, when the rolling force reaches 800 KN, the second intermediate roll suspension mechanism switches to the low-pressure suspension state, and a 24V power control line reaches the high and low pressure remote switching of the electric control type secondary pressure control valve 6.

[0029] The working principle of the present invention will be specifically described below.

[0030] During use, the hydraulic cylinder 41 drives the telescopic rod 42 to extend and retract, thereby driving the two intermediate rolls 22 on both sides to smash down through the connecting rod 43, and driving the two intermediate rolls 22 in the middle to move synchronously through the toothed plate 44 and the gear 45. Among them, the pressure of the hydraulic cylinder 41 is controlled by the secondary pressure control valve 6. When the roll gap of the rolling mill is opened, the suspension mechanism of the two intermediate rolls switches to the high-pressure state (6 MPa) and opens the roll gap together with the roll system. When the roll gap of the rolling mill is closed and the rolling force reaches 800 KN, the suspension mechanism of the two intermediate rolls automatically switches to the low-pressure state (1 MPa) to achieve automatic high-low pressure switching. Thereby greatly reducing the eccentric load force on the bearings of the two intermediate rolls during high-speed rolling, improving their service life, reducing the cost of bearing spare parts, reducing the risk of strip scratching, reducing risks such as rolling safety, and further reducing the friction between the bearing fragmentation and the roller end when the suspension bearings of the two intermediate rolls 22 are abnormally worn severely, preventing safety risks such as fire in severe cases, and reducing quality problems such as vibration marks on the strip surface caused by the roll system vibration when the suspension bearings of the two intermediate rolls 22 are abnormally worn severely.

Claims

1. A roll suspension mechanism of a rolling mill, characterized in that: Inside the rolling mill, there is a roll system and a power system. In the roll system, three rows of rolls are distributed from top to bottom, including four backup rolls, three second intermediate rolls, and two first intermediate rolls. The power system includes a hydraulic cylinder and a telescopic sleeve rod. A secondary pressure control valve is provided on the hydraulic cylinder. One end of the telescopic sleeve rod is controlled by the hydraulic cylinder, and the other end of the telescopic sleeve rod is installed with a connecting rod. The other end of the connecting rod is respectively connected to the second intermediate roll and the first intermediate roll, so as to realize the movement of the second intermediate roll and the first intermediate roll driven by the hydraulic cylinder. The transmission mechanism includes gears installed on the outer sides of the two middle backup rolls. A toothed plate is provided on the connecting rod of the middle second intermediate roll. The inner sides of the two gears are meshed with the toothed plate, and the toothed plate and the gears are mutually driven.

2. The roll suspension mechanism of a rolling mill according to claim 1, wherein the second intermediate roll is suspended and fixed by bearings, and motors are connected to the inner sides of the second intermediate rolls on both sides through universal joints and are driven to rotate by the motors.

3. The roll suspension mechanism of a rolling mill according to claim 1, characterized in that All the rolls in the roll system are mutually driven by the friction force generated after the pipe seams are closed.

4. The roll suspension mechanism of a rolling mill according to claim 1, characterized in that The four backup rolls are provided with multi-point supports by using saddles and segmented bearings.

5. The roll suspension mechanism of a rolling mill according to claim 1, characterized in that Working rolls are arranged below the two first intermediate rolls, and multi-point supports are arranged in the length direction of the working rolls.

6. The roll suspension mechanism of a rolling mill according to claim 1, characterized in that The bottom of the rolling mill is connected with a base for support.

7. A control method for a roll suspension mechanism of a rolling mill according to any one of claims 1 to 6, characterized in that The secondary pressure control valve is controlled by a second intermediate roll suspension secondary pressure control program, so that when the roll gap is opened, the second intermediate roll suspension mechanism switches to the high-pressure suspension state, and when the rolling force reaches a certain value after the roll gap is closed, the second intermediate roll suspension mechanism switches to the low-pressure suspension state, and a power control line realizes the remote high-low pressure switching of the electro-controlled secondary pressure control valve.

Images