CN106391700B - A kind of lower drive-type Y types four-roller strip-mill strip - Google Patents

Abstract

A bottom-driven Y-shaped four-high plate and strip mill comprises: a frame, a pressing assembly, a roll system assembly, a back-up roll balancing assembly, an upper working roll balancing assembly, and a variable speed ratio regulating assembly. Among them, the roll system components are arranged in a Y-shaped way. The diameter of the upper work roll is smaller than the diameter of the lower work roll to form different-diameter rolling. The support roll bearing is integrated. The roller balance assembly and the variable speed ratio adjustment assembly are composed of a sleeve, an arc surface friction plate and a hydraulic cylinder. The ratio of the line speed of the upper work roll to the line speed of the lower work roll is not 1 to form differential rolling. The invention can effectively reduce the rolling force, reduce the elastic flattening and deflection of the roll, improve the rolling quality of the strip, and increase the rolling range of the strip; at the same time, it can also reduce the deflection during the rolling process, greatly It improves the rollable range of the strip and has the potential to roll extremely thin strips. The invention has simple structure, is convenient for adjustment and maintenance, and has low manufacturing cost.

Description

A bottom-driven Y-shaped four-high plate and strip mill

technical field

The invention relates to a processing equipment for cold-rolled strips.

Background technique

Improving the quality of strip production, reducing the cost of strip production, and improving the production efficiency of strip are the eternal pursuits in the production process of cold-rolled strip. In order to obtain a high-quality, low-cost, and high-efficiency cold-rolled strip production process, scholars and experts at home and abroad have designed and manufactured various forms of rolling mills to find a more excellent cold-rolled strip production process. Among them, four-high rolling mill, six-high HC (High Crown, high-performance roll crown) rolling mill, HCW (work roll moving HC) rolling mill, twelve-high rolling mill and twenty-high rolling mill have been used in the cold rolling strip process. In order to enable the rolling mill to obtain the function of adjusting the shape of the strip, various roll shape adjustment methods such as hydraulic roll bending, stringing rolls, water spray, CVC (Continuous Variable Crown, continuous variable crown) roll shape are usually used to change the shape of the bearing roll gap, Then control the shape of the strip and improve the quality of the strip. In recent years, scholars at home and abroad have successively proposed segmental heating in the through hole of the roll to change the shape of the roll, and then obtain the function of regulating the shape of the roll. The inventor once invented a patent "an endogenously driven rolling mill for comprehensive control of plate shape and thickness" (CN201210015055.0), which uses electric thermal expansion rods to change the roll profile curve and control the plate shape. This patent introduces the application of electromagnetic flatness control technology in rolling mill equipment, but does not give a specific scheme for realizing electromagnetic flatness control, nor does it propose the structural form and implementation method of Y-shaped rolling mill, and does not have different speeds Regulatory components.

Contents of the invention

The purpose of the present invention is to provide a Y-type four-roll strip mill with bottom drive, which can comprehensively control the shape of the strip, adjust the different speed ratio, and have a larger rolling thickness range.

The rolling mill of the present invention mainly includes: a frame, a pressing assembly, a roll system assembly, a back-up roll balancing assembly, an upper working roll balancing assembly and a different speed ratio regulating assembly. Wherein, the frame is composed of two vertically juxtaposed hollow rectangular frames fixed at the top, and a depressing assembly is arranged on the top of the frame, and the depressing assembly can be depressed both hydraulically and electrically. The two pressure heads of the hydraulic pressure or electric pressing assembly respectively pass through the support roller balance assembly at the upper part of the frame and the lower end is placed on the integrated support roller bearing seat of the roller system assembly in the frame. Two ends of two supporting rollers are respectively arranged on the two integrated supporting roller bearing seats, and the two supporting rollers have the same diameter and are paralleled on a horizontal plane, and the distance between the two axes is greater than the diameter of the supporting rollers. An upper work roll whose diameter is smaller than the support roll and is tangent to the roll surfaces of the two support rolls is arranged below between the two support rolls. Below the upper work roll, there is a lower work roll whose axis is parallel to it and in the same vertical plane. The diameter of the lower work roll is larger than that of the upper work roll to form a different-diameter rolling unit, and an electric thermal expansion rod is installed inside the lower work roll. It is used to change the roll shape of the lower work roll, and then adjust the shape of the strip. The two ends of the lower work roll are arranged on the bearing seat of the lower work roll, and the bearing seat is arranged on the frame, so that the two support rolls and the two work rolls below are arranged in a Y shape. The two ends of the upper work roll shaft respectively pass through an upper work roll chock, and the shaft head at one end of the upper work roll shaft outside the upper work roll chock is connected with the sleeve provided on it through a spline, and the sleeve below There is an arc surface friction plate tangent to it, and the friction plate is threadedly connected with the piston rod of the hydraulic cylinder, and the lower end of the hydraulic cylinder is fixed on the bearing seat of the lower work roll through the flange. The bearing seat of the upper work roll is connected to one end of the door-shaped pull rod frame, and the other end of the pull rod frame is provided with a through hole, and the upper part of the pull rod whose lower end is connected to the through hole passes through the guide rod, and the guide rod is fixed on the integrated support roller bearing On the seat, it is used to guide the pull rod to ensure that the pull rod moves in the vertical direction. The pull rod of the guide rod is provided with a spring and a nut threaded with it in turn, so the nut compresses the spring, and the spring gives the nut a reaction force, so that the pull rod receives an upward force to balance the weight of the upper work roll and ensure that the upper work roll is in contact with the two supports. The roll faces of the rolls are tangential. The ends of the upper and lower work rolls are respectively connected to an encoder through a flat key, so as to measure the speed of the upper and lower work rolls respectively, and feed back the measured speed to the computer control platform. The computer control platform provides an adjustable positive pressure between the arc surface friction plate and the sleeve by controlling the hydraulic cylinder, increasing the friction between the two, and adding a hindering torque to the rotation of the upper work roll, which is regulated by adjusting the positive pressure Friction torque, that is, to adjust the resistance torque of the upper work roll rotation, and then adjust the speed of the upper work roll to achieve different speed rolling. The ratio of the line speed of the upper work roll to the line speed of the lower work roll is not 1 to form differential rolling. In this control mode, the linear speed of the upper work roll can only be adjusted to a small value.

Compared with the prior art, the present invention has the following advantages:

1. Compared with ordinary four-roll and six-roll rolling mills, the present invention has different diameter and different speed rolling characteristics, which can effectively reduce rolling force, reduce elastic flattening and deflection of rolls, improve strip rolling quality, and increase Strip rolling range.

2. Compared with ordinary different-diameter rolling, in the present invention, the two horizontally arranged support rolls greatly improve the rigidity of the upper roll system, reduce the deflection deformation in the rolling process, and greatly improve the stability of the strip. Rollable range, with the potential to roll very thin strips. The addition of the variable speed ratio control system can accurately control the variable speed ratio in the rolling process and improve the rolling process range of the rolling mill.

3. Compared with the multi-roll rolling mill and the multi-roll reducing mill, the present invention has the advantages of simple structure, convenient adjustment and maintenance, and low manufacturing cost.

4. In addition, the electric thermal expansion rod is added to the lower work roll to adjust the roll shape of the lower work roll, and then control the shape of the plate. The one-piece back-up roll chock makes it easier to ensure the position between the two back-up rolls and the upper work roll, and ensures that the plane formed by the axes of the two back-up rolls is a horizontal plane, thereby ensuring the balance of force on the back-up rolls.

Description of drawings

Fig. 1 is the three-dimensional schematic diagram of the present invention;

Fig. 2 is a schematic diagram of the axial side of the roll system and the upper work roll balance assembly of the present invention;

Fig. 3 is a schematic left view of the roll system and the upper work roll balance assembly of the present invention;

Fig. 4 is a schematic diagram of the roll position of the present invention;

Fig. 5 is a three-dimensional schematic view of the upper work roll assembly of the present invention;

Fig. 6 is a schematic diagram of the variable speed ratio regulating component of the present invention.

In the figure: 1. Rack, 2. Depression assembly, 3. Roller system assembly, 4. Upper support roll balance assembly, 5. Upper work roll balance assembly; 6. Different speed ratio control assembly, 301. Right support roll, 302. Integrated back-up roll chock, 303. Back-up roll chock slide plate, 304. Lower work roll chock slide, 305. Lower work roll chock, 306. Lower work roll, 307. Lower work roll encoder, 308. Protective cover, 309. End cover of lower work roll chock, 310. Upper work roll encoder, 311. Upper work roll chock, 312. Pull rod, 313. Guide rod, 314. Spring, 315. Nut, 316. Support Roller chock end cover, 317. Left support roll, 318. Locating pin, 319. Upper work roll chock end cover, 320. Sleeve, 321. Arc surface friction plate, 322. Hydraulic cylinder, 323. Lock nut, 324. round nut, 325. upper work roll.

detailed description

Below in conjunction with accompanying drawing and specific embodiment, structure and working principle of the present invention are further explained:

In the three-dimensional schematic diagram of the bottom-driven Y-type four-high plate and strip mill shown in Figure 1, the rolling mill of the present invention mainly includes: a frame 1, a pressing assembly 2, a roll assembly 3, a backup roll balance assembly 4, and an upper work roll Balance component 5 and variable speed ratio regulating component 6. Frame 1 is composed of two vertically juxtaposed hollow rectangular frames fixed at the top, and a pressing assembly 2 is arranged on the top of the frame. The lower end of the assembly is placed on the integrated support roller bearing seat 302 of the roller train assembly in the frame. In the schematic diagrams of the upper work roll balance assembly shown in Fig. 2 and Fig. 3, the two ends of the two support rolls 301, 317 are respectively arranged on the two integrated support roll bearing housings, and the two support rolls have the same diameter and are arranged side by side. On a horizontal plane and the distance between the two axes is greater than the diameter of the support roller. An upper work roll 325 with a diameter smaller than the support roll and tangent to the roll surfaces of the two support rolls is provided below between the two support rolls. Below the upper work roll, there is a lower work roll 306 whose axis is parallel to it and in the same vertical plane. Built-in electric heating rod. The two ends of the lower work roll are arranged on the lower work roll chock 305, which is arranged on the frame. Both ends of the upper work roll shaft respectively pass through an upper work roll chock, as shown in Fig. Connected to the cylinder 320, under the sleeve there is an arc-shaped friction plate 321 tangent to it, the friction plate is threadedly connected with the piston rod of the hydraulic cylinder 322, and the lower end of the hydraulic cylinder is fixed on the lower work roll bearing seat 305 through a flange, as shown in the figure As shown in 6, the other end of the upper work roll shaft located outside the bearing seat is connected with the encoder 310 through a flat key. The bearing seat of the upper work roll is connected to one end of the door-shaped pull rod frame, and the other end of the pull rod frame is provided with a through hole, and the upper part of the pull rod 312 whose lower end is connected to the through hole passes through the guide rod 313, and the guide rod is fixed on the integral support on the roller chock. A spring 314 and a nut 315 threaded thereon are sequentially provided on the pull rod of the guide rod. The top of the lower work roll is connected with the encoder 307 through a flat key.

Working process of the present invention is roughly as follows:

1. According to the initial thickness and reduction of the strip, use the reduction system 2 to adjust the upper roll system so that the roll gap between the upper work roll 325 and the lower work roll 306 meets the rolling conditions.

2. Adjust the motor speed according to the speed ratio required in the process, and use the computer to control the hydraulic cylinder 322 to give an initial positive pressure between the sleeve 320 and the arc-shaped friction plate 321 .

3. Apply tension to the front and rear of the strip, turn on the motor, and drive the lower work roll 306 for rolling. Measure the line speed of the upper work roll 325 by the upper work roll encoder 310, and measure the line speed of the lower work roll 306 by the lower work roll encoder 307, compare the ratio of the two speeds with the gap of the speed ratio required by the process, and feed it back to the computer. If the actual speed ratio is greater than the speed ratio required by the process, the positive pressure between the sleeve 320 and the arcuate friction plate 321 is relatively small, and the computer controls the hydraulic cylinder 322 to increase the positive pressure between the sleeve 320 and the arcuate friction plate 321 , until the process requirement speed ratio is met. Conversely, reduce the positive pressure between the sleeve 320 and the arcuate friction plate 321 until the speed ratio required by the process is met.

4. The shape of the strip rolled by the rolling mill is measured by the shape meter, and after feedback, the shape of the lower work roll 306 is changed by using the electric thermal expansion rod to adjust the shape of the strip.

Claims (2)

1. A kind of 1. lower drive-type Y types four-roller strip-mill strip, it is characterised in that：Frame is connected two vertical arranged side by side hollow by top Rectangular frame forms, and hydraulic pressure or Electro-pressing component is provided with frame top, two pressure heads of the pressure component are each passed through frame The backup roll's balancing component of internal upper part and lower end is placed on the integral type supporting roller bearing seat of roller module in frame, at two one The both ends for having two support rollers respectively on body formula supporting roller bearing seat are located at thereon, and the two supports roller diameter is identical and is listed in a water In plane and two axial lines distance be more than support roller diameter, between two support rollers below be provided with two support roller roll surfaces it is tangent Diameter be less than support roller top working roll, top working roll be arranged below axis it is in parallel and in same vertical plane under Working roll, the bottom working roll diameter is more than top working roll diameter and forms reducing rolling unit, and it is swollen that electric heating is set in bottom working roll Rod, the bottom working roll both ends are located on bottom working roll bearing block, and the bearing block is located in frame, and the both ends of top working roll axle are respectively worn Cross a top working roll bearing block, the top working roll axle position in top working roll bearing block outside end spindle nose by spline with setting In sleeve connection thereon, the cambered surface friction piece tangent with it, the friction plate and hydraulic cylinder piston rod spiral shell is arranged below in the sleeve Line is connected, and the hydraulic cylinder lower end is fixed on bottom working roll bearing block by flange, and top working roll axle position is outside bearing block The other end is connected by flat key with encoder, and the top working roll bearing block is connected with door shape pulling-rod frame one end, the pulling-rod frame The other end sets through hole, and the pull bar top that lower end is connected with the through hole passes through position guiding rod, and the position guiding rod is fixed on integral type support roller On bearing block, spring and the nut being threadedly coupled with it are sequentially provided with the pull bar of position guiding rod, bottom working roll end top passes through flat Key is connected with an encoder.
2. 2. lower drive-type Y types four-roller strip-mill strip according to claim 1, it is characterised in that：The linear velocity of top working roll Friction speed rolling is not formed with the linear velocity ratio of bottom working roll for 1.