Constant roll gap device

Abstract

The utility model discloses a kind of constant roll gap press-down devices, it is related to cold-rolled steel strip rolling technical field, including pedestal, press-down oil cylinder, support shaft core, support roll, press-down roll, fixed roll and compensation lower pressure mechanism, the upper surface both ends of the pedestal are fixedly installed with press-down oil cylinder, the lower of the pedestal is installed with two support shaft cores, the outer side of the support shaft core is fixedly sleeved with support roll, and support roll is in contact with the lower surface of pedestal, the lower of two support rolls is equipped with press-down roll, press-down roll outer surface is in contact with two support rolls, the lower of the press-down roll is installed with fixed roll, the outer side of the support roll is equipped with compensation lower pressure mechanism, the utility model reduces strip rolling thickness tolerance, by synchronous press-down and micron level roll gap control ability, so that the thickness deviation of strip along width direction in rolling process is greatly reduced, and the thickness uniformity of finished strip is greatly improved.

Description

Technical Field

[0001] This utility model relates to the field of cold-rolled steel strip rolling technology, specifically a constant roll gap pressing device. Background Technology

[0002] In the field of cold-rolled strip production, precision 20-roll mills are widely used because they can achieve high-precision rolling. In 20-roll mills, accurately controlling the rolled thickness of the strip is a crucial step, which is usually achieved by adjusting the gap between the upper and lower rolls (including work rolls or transition rolls), i.e., by performing a pressing operation.

[0003] Existing 20-roll rolling mills commonly use hydraulic cylinders as the main driving element for strip reduction. Typically, two hydraulic cylinders are configured, and their extension and retraction strokes are controlled to adjust the roll gap, thereby controlling the amount of strip reduction and the final thickness. Theoretically, precise control of the hydraulic cylinder displacement can directly correspond to the desired strip thickness.

[0004] However, in actual rolling processes, even when using the same control system to drive the two hydraulic cylinders to move synchronously, it is still difficult to completely avoid inconsistencies in the amount of reduction on both sides, resulting in thickness deviations in the width direction of the rolled strip. This synchronization problem can be affected by various factors, such as pressure fluctuations in the hydraulic oil supply system, differences in the frictional characteristics of the two hydraulic cylinders, uneven hardness of the rolled strip material, and insufficient rigidity of the hydraulic cylinder mounting structure itself. These factors can all interfere with the precise synchronization and stable positioning of the hydraulic cylinders, posing a challenge to the traditional direct hydraulic cylinder pressing method in achieving micron-level high-precision thickness control, thus affecting the quality and yield of the finished strip.

[0005] Therefore, how to provide a pressing device that can overcome the problems of poor synchronization of hydraulic cylinders and easy drift of pressing position in the existing technology, so as to achieve a more stable and accurate pressing device, especially capable of micron-level roll gap adjustment, is a technical problem that urgently needs to be solved in the field of cold-rolled strip technology. Utility Model Content

[0006] The problem to be solved

[0007] In view of the problems existing in the prior art, the purpose of this utility model is to provide a constant roll gap pressing device to solve the problems mentioned in the background art.

[0008] Technical solution

[0009] To achieve the above objectives, this utility model provides the following technical solution:

[0010] A constant roll gap pressing device includes a base, pressing cylinders, support shafts, support rollers, pressing rollers, fixed rollers, and a compensating pressing mechanism. Pressing cylinders are fixedly installed at both ends of the upper surface of the base. Two support shafts are installed below the base. Support rollers are fixedly sleeved on the outer sides of the support shafts, and the support rollers contact the lower surface of the base. A pressing roller is located below the two support rollers, and its outer surface contacts the two support rollers. A fixed roller is installed below the pressing rollers. A compensating pressing mechanism is located on the outer side of the support rollers. The compensating pressing mechanism includes a pressing rack and an adjusting gear. The output end of the pressing cylinder penetrates the upper inner wall of the base and is fixedly connected to a vertically arranged pressing rack. Adjusting gears are fixedly sleeved at both ends of the support shafts, and the adjusting gears mesh with the pressing rack.

[0011] As a further embodiment of this invention, the adjusting gear is an eccentric gear.

[0012] As a further embodiment of this invention: a plurality of evenly distributed torsion springs are connected between the base and the support roller.

[0013] As a further embodiment of this utility model: the adjusting gear is eccentrically fixedly sleeved on the supporting shaft core. When the adjusting gear rotates, its eccentric structure drives the supporting shaft core to swing relative to the base, thereby changing the vertical position of the supporting roller.

[0014] As a further embodiment of this utility model, the pressing rack is a precision rack.

[0015] As a further aspect of this utility model, the adjusting gear is a precision gear.

[0016] Compared with the prior art, the beneficial effects of this utility model are:

[0017] This invention reduces the thickness tolerance of strip rolling by simultaneously pressing down and controlling the roll gap at the micron level, which greatly reduces the thickness deviation of the strip along the width direction during rolling and significantly improves the thickness uniformity of the finished strip.

[0018] This invention improves the yield of finished strip by reducing the thickness tolerance of the strip, which directly corresponds to the improvement of the quality of the finished strip, resulting in a lower scrap rate and a higher yield. Attached Figure Description

[0019] Figure 1 This is a schematic diagram of a constant roll gap pressing device;

[0020] Figure 2 This is a side view schematic diagram of a constant roll gap pressing device;

[0021] Figure 3This is a side sectional view of a constant roll gap pressing device.

[0022] In the diagram: 1. Pressing cylinder; 2. Base; 3. Pressing rack; 4. Support shaft; 5. Adjusting gear; 6. Pressing roller; 7. Fixed roller; 8. Support roller; 9. Torsion spring. Detailed Implementation

[0023] The technical solutions of the present invention will be clearly and completely described below with reference to the accompanying drawings of the embodiments of the present invention.

[0024] Please see Figures 1-3 In this embodiment of the utility model, a constant roll gap pressing device includes a base 2, a pressing cylinder 1, a support shaft core 4, a support roller 8, a pressing roller 6, a fixed roller 7, and a compensating pressing mechanism.

[0025] A pressing cylinder 1 is fixedly installed at both ends of the upper surface of the base 2. Two support shafts 4 are installed below the base 2. Support rollers 8 are fixedly sleeved on the outer side of the support shafts 4. Multiple evenly distributed torsion springs 9 are connected between the base 2 and the support rollers 8. The torsion springs 9 help maintain the contact between the support rollers 8 and the base 2, and also provide a certain preload and rebound force. The support rollers 8 are in contact with the lower surface of the base 2. A pressing roller 6 is provided below the two support rollers 8. The outer surface of the pressing roller 6 is in contact with the two support rollers 8. A fixed roller 7 is installed below the pressing roller 6. A compensating pressing mechanism is provided on the outer side of the support rollers 8. The compensating pressing mechanism includes a pressing rack 3 and an adjusting gear 5. The adjusting gear 5 is an eccentric gear. The output end of the pressing cylinder 1 passes through the upper inner wall of the base 2 and is fixedly connected to a vertically arranged pressing rack 3. The two ends of the support shaft core 4 are fixedly sleeved with adjusting gears 5. The adjusting gear 5 meshes with the pressing rack 3. The adjusting gear 5 is eccentrically fixedly sleeved on the support shaft core 4. When the adjusting gear 5 rotates, its eccentric structure drives the support shaft core 4 to swing relative to the base 2, thereby changing the vertical position of the support roller 8. The pressing rack 3 is a precision rack, and the adjusting gear 5 is a precision gear.

[0026] It should be noted that this utility model, through its designed compensating pressing mechanism, effectively overcomes the problems of poor synchronization and unstable pressing position that exist in the existing technology of direct pressing by hydraulic cylinders.

[0027] The core working principle of this device lies in achieving high-precision control and synchronization of the pressing action through the precise meshing of the pressing rack 3 and the adjusting gear 5. When the pressing cylinder 1 extends or retracts, it directly drives the pressing rack 3 connected to its output end to move linearly in the vertical direction. The pressing rack 3 meshes with the adjusting gear 5 installed on the support shaft core 4, converting the linear motion of the pressing cylinder 1 into the rotational motion of the adjusting gear 5. Since the two pressing cylinders 1 are respectively connected to the pressing rack 3, and the arrangement of the adjusting gear 5 makes the movements of the two pressing racks 3 interconnected through the gear meshing system, even if there is a slight difference in the output force or speed of the two pressing cylinders 1, the linkage of the rack and gear will force the two pressing racks 3 to maintain synchronous movement. This mechanical linkage synchronization method effectively avoids the problem of asynchronous pressing caused by various interference factors in the traditional hydraulic cylinder system, ensuring the consistency of the pressing amount on both sides of the device.

[0028] Furthermore, this device utilizes an eccentric adjusting gear 5, which is eccentrically fixed onto the support shaft core 4. When the pressing rack 3 drives the adjusting gear 5 to rotate, the eccentric structure of the adjusting gear 5 causes the support shaft core 4 to undergo vertical displacement relative to the base 2. This vertical displacement of the support shaft core 4 directly drives the support roller 8 on its outer side to move vertically with the same amplitude, thereby precisely adjusting the relative position between the support roller 8 and the pressing roller 6. This achieves micron-level control of the pressing amount of the pressing roller 6, ensuring stable and reliable position changes during the pressing process and reducing drift. The use of the precision pressing rack 3 and the precision adjusting gear 5 further ensures the accuracy of transmission and positioning, providing a structural basis for achieving ultra-micron-level roller gap adjustment.

[0029] Based on the above working principle, this invention can achieve stable, synchronous pressing operation with micron-level adjustment capability, and its advantages are as follows:

[0030] Reduced strip rolling thickness tolerance: Synchronous pressing and micron-level roll gap control capabilities greatly reduce the thickness deviation of the strip along the width direction during rolling, and significantly improve the thickness uniformity of the finished strip.

[0031] Improving the qualification rate of finished strip: The reduction of strip thickness tolerance directly corresponds to the improvement of finished strip quality, the reduction of scrap rate, and the improvement of qualification rate.

[0032] In summary, this utility model, through structural innovation, introduces a rack and pinion linkage synchronization and eccentric gear fine adjustment mechanism, providing a constant roll gap pressing device, which provides strong technical support for the production of cold-rolled precision strip.

[0033] The circuits and controls involved in this utility model are all existing technologies, and will not be described in detail here.

[0034] The above description is only a preferred embodiment of the present utility model and is not intended to limit the present utility model. Any modifications, equivalent substitutions and improvements made within the spirit and principles of the present utility model should be included within the protection scope of the present utility model.

Claims

1. A constant roll gap pressing device, characterized in that, include: Base (2); Pressing cylinder (1), both ends of the upper surface of the base (2) are fixedly installed with pressing cylinder (1); Support shaft core (4), two support shaft cores (4) are installed below the base (2); Support roller (8), the support roller (8) is fixedly sleeved on the outside of the support shaft core (4), and the support roller (8) is in contact with the lower surface of the base (2); A pressing roller (6) is provided below the two support rollers (8), and the outer surface of the pressing roller (6) is in contact with the two support rollers (8); Fixed roller (7), a fixed roller (7) is installed below the pressing roller (6); The compensating pressing mechanism is provided on the outside of the support roller (8). The compensating pressing mechanism includes a pressing rack (3) and an adjusting gear (5). The output end of the pressing cylinder (1) passes through the upper inner wall of the base (2) and is fixedly connected to the vertically arranged pressing rack (3). The two ends of the support shaft core (4) are fixedly sleeved with adjusting gears (5). The adjusting gears (5) mesh with the pressing rack (3).

2. The constant roll gap pressing device according to claim 1, characterized in that, The adjusting gear (5) is an eccentric gear.

3. The constant roll gap pressing device according to claim 1, characterized in that, A plurality of evenly distributed torsion springs (9) are connected between the base (2) and the support roller (8).

4. The constant roll gap pressing device according to claim 2, characterized in that, The adjusting gear (5) is eccentrically fixed on the support shaft core (4). When the adjusting gear (5) rotates, its eccentric structure drives the support shaft core (4) to swing relative to the base (2), thereby changing the vertical position of the support roller (8).

5. The constant roll gap pressing device according to claim 1, characterized in that, The pressing rack (3) is a precision rack.

6. The constant roll gap pressing device according to claim 1, characterized in that, The adjusting gear (5) is a precision gear.

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