High-precision same-turning roller adjusting mechanism and prestressed rolling mill

Abstract

The invention discloses a high-precision same-turning roller adjusting mechanism and a pre-stressed rolling mill. The two racks are symmetrically arranged; bearing seat adjusting devices are installed on the portions, corresponding to the two sides of the upper bearing seat, of each rack, and two second-stage worm and gear reduction gearboxes are arranged on the portions, corresponding to the upper bearing seat adjusting devices, of the top of each rack. A first-stage worm and gear reduction gearbox is arranged between the two second-stage worm and gear reduction gearboxes of each rack; worms of the two primary worm and gear reduction gearboxes are connected together through a connecting assembly and used for being connected with a driving device. The two axial sides of a worm wheel of each first-stage worm and gear reduction gearbox extend out to be coaxial with a worm of the corresponding second-stage worm and gear reduction gearbox. And a worm gear of each secondary worm and gear reduction gearbox is in transmission connection with the bearing seat adjusting device. Compared with a straight gear pair, a helical gear pair and the like, the two stages of worm and gear pair transmission mechanisms are arranged, so that the speed ratio is greatly increased, and the adjusting precision of the roller is improved.

Description

Technical Field

[0001] This invention relates to a high-precision co-rotating roll adjustment mechanism and a prestressed rolling mill. Background Technology

[0002] Rolls are the main working components on a rolling mill that cause continuous plastic deformation of metal. The position of the rolls needs to be adjusted during the production process according to the product type and their own wear. The accuracy of the roll position determines the final dimensional accuracy and quality of the rolled workpiece, so roll adjustment is an important part of the production process.

[0003] Rolls in rolling mills are connected as a single roll system via bearing housings on both sides. The roll system is then connected to lead screws via nuts in the bearing housings. The lead screws are fixed vertically to the mill frame and can only rotate. Adjusting the roll position is achieved by rotating the lead screws, which in turn moves the nuts in the bearing housings up and down, thus adjusting the position of the entire roll system. Many rolling mills have lead screws on both sides of the bearing housings, so adjusting the roll position requires simultaneously driving four lead screws on two bearing housings. Existing roll adjustment mechanisms generally suffer from low speed ratios, low adjustment accuracy, and inconsistent rotation directions of the four output screws, leading to different lead screw types and potential assembly errors and accidents. (Invention Content)

[0004] To overcome the above-mentioned defects, the present invention provides a high-precision co-rotating roll adjustment mechanism and a prestressed rolling mill.

[0005] To achieve the above objectives, the present invention provides a high-precision, same-direction roll adjustment mechanism, comprising: two symmetrically arranged frames; and bearing seat adjustment devices installed on both sides of each frame corresponding to the bearing seats.

[0006] Two two-stage worm gear reducers are provided on the top of each frame corresponding to the bearing seat adjustment device;

[0007] A primary worm gear reducer is installed between the two secondary worm gear reducers on each frame;

[0008] The worms of the two single-stage worm gear reducers are connected together by a connecting assembly to connect the drive unit;

[0009] The worm wheel of each first-stage worm gear reducer extends axially to both sides and is coaxially set with the worm of the corresponding second-stage worm gear reducer.

[0010] The worm gear in each two-stage worm gear reducer is connected to the bearing housing adjustment device.

[0011] This invention, by setting up a two-stage worm gear transmission mechanism, significantly increases the speed ratio and improves the adjustment accuracy of the rolls compared to spur gear pairs and helical gear pairs. Simultaneously, the optimized arrangement of the worm gear pairs ensures that the final output sleeves all rotate in the same direction, and only one type of paired lead screw and nut is required, reducing the number of equipment types and spare parts, saving investment, and facilitating the overall assembly of the rolling mill.

[0012] To achieve the above objectives, the present invention provides a fast-response high-precision prestressed rolling mill, comprising two symmetrically arranged stands;

[0013] A prestressing cylinder is installed on the upper beam of each frame, and the drive shaft of the prestressing cylinder extends downward from the upper beam and is located below the upper beam;

[0014] An upper bearing seat is slidably disposed in the frame below the prestressed cylinder, corresponding to the drive shaft; the drive shaft of the prestressed cylinder is connected to the upper bearing seat to provide prestress to the upper bearing seat.

[0015] On the frames on both sides of the prestressed cylinder, there are upper bearing seat adjustment devices installed on both sides of the upper bearing seat to adjust the upper and lower positions of the upper bearing seat.

[0016] An adjusting hydraulic cylinder is provided on the lower beam of each frame, and the drive shaft of the adjusting hydraulic cylinder extends upward from the lower beam and is located above the lower beam; a lower bearing seat is slidably arranged in the frame below the upper bearing seat; the drive shaft of the adjusting hydraulic cylinder is connected to the lower bearing seat to drive the lower bearing seat to slide up and down.

[0017] The upper roll is mounted on two upper bearing seats; the lower roll is mounted on two lower bearing seats.

[0018] The aforementioned high-precision tandem roll adjustment mechanism is installed on the two frames.

[0019] To achieve the above objectives, the control method for a fast-response high-precision prestressed rolling mill of the present invention is based on the aforementioned fast-response high-precision prestressed rolling mill and includes the following steps:

[0020] The position of the upper roll in the frame is adjusted using the upper bearing seat adjustment device;

[0021] By using the prestressed cylinders on both sides to apply prestress greater than the rolling force to the upper bearing seat, the adjustment device is placed under pressure.

[0022] Adjust the hydraulic cylinder to drive the lower bearing housing to the predetermined position in the frame.

[0023] This invention provides the upper bearing housing with prestress greater than the rolling force through an upper prestressing cylinder, placing the adjustment device under pressure. Therefore, during rolling, all parts except the rolls will no longer experience bouncing deformation, greatly improving product rolling accuracy. The bearing housing is connected to the mill frame via an adjusting hydraulic cylinder, which ensures the lower bearing housing has fast response and high precision. In summary, this invention offers high rolling accuracy, allowing for rapid and precise online adjustment of the lower bearing housing to meet the mill roll gap adjustment requirements. Furthermore, the elevation of the rolling centerline can be flexibly adjusted in advance as needed, facilitating the entry of steel billets of various specifications and reducing the occurrence of impacts and steel piling accidents during the rolling process. Attached Figure Description

[0024] Figure 1 This is a three-dimensional schematic diagram of the frame of a fast-response high-precision prestressed rolling mill according to the present invention.

[0025] Figure 2 This is a cross-sectional schematic diagram of the frame of a fast-response high-precision prestressed rolling mill according to the present invention.

[0026] Figure 3 for Figure 2 The diagram shows a fast-response high-precision prestressed rolling mill after the rolls are installed.

[0027] Figure 4 This is a schematic diagram of the flexible anti-shaft movement mechanism for the rolls in this invention.

[0028] Figure 5 for Figure 4 A horizontal cross-sectional view.

[0029] Figure 6 for Figure 5 A partial sectional view.

[0030] Figure 7 This is a side view and a front view of a slider.

[0031] Figure 8 These are the side and front views of the locating pin.

[0032] Figure 9 This is a schematic diagram of the deformation of a rolling mill roll under stress.

[0033] Figure 10 This is a cross-sectional schematic diagram of the roll adjustment mechanism.

[0034] Figure 11 for Figure 10 A cross-sectional schematic diagram of the roll adjustment mechanism.

[0035] Figure 12 This is a side view of the roll adjustment mechanism.

[0036] Figure 13 This is a top view of the roll adjustment mechanism. Detailed Implementation

[0037] The embodiments of the present invention will now be described in detail with reference to the accompanying drawings.

[0038] In the description of this invention, it should be understood that the terms "center", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this invention.

[0039] The terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of this invention, unless otherwise stated, "a plurality of" means two or more.

[0040] In the description of this invention, it should be noted that, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "joining" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal communication between two components. Those skilled in the art can understand the specific meaning of the above terms in this invention based on the specific circumstances.

[0041] The fast-response high-precision rolling mill of the present invention includes upper and lower roll systems. One roll system bearing housing is connected to the lead screw by a nut, and prestress is applied to the bearing housing by a hydraulic cylinder to realize a prestressed structure and improve rolling accuracy. The other roll system bearing housing is adjusted in position by a hydraulic cylinder, which can realize online fast and accurate adjustment of the roll position.

[0042] As shown in the figure, the present invention includes at least: a prestressed cylinder 1, a frame 2, an upper roller system (upper bearing seat) 3, a lower roller system (lower bearing seat) 4, an adjusting hydraulic cylinder 5, a lead screw 6, a sliding plate 7, a spherical pad 8, a nut 9, a sealing sleeve 10, a pressure cap 11, and a sleeve 12.

[0043] like Figure 1 As shown, the frame 2 includes an operating side frame and a transmission side frame. The frame 2 has a frame structure with crossbeams at both the upper and lower parts, and positioning mechanisms 22 are installed at both the upper and lower crossbeams. The two frames can be connected together through the positioning mechanisms 22.

[0044] Each frame has holes and slots for installing prestressed cylinder 1 and adjusting hydraulic cylinder 5 at the top and bottom, respectively. Holes for installing screw rod 6, pressure cap 11 and sleeve 12 are provided on the middle two sides of the frame 2.

[0045] Both the upper bearing seat 3 and the lower bearing seat 4 are combined components with a roller in the middle and bearing seats on both sides.

[0046] The adjustment device for the upper bearing housing 3 includes holes for mounting a lead screw 6, a spherical washer 8, and a nut 9 on both sides of the bearing housing. One end of the spherical washer 8 is flat and is directly mounted on the bearing housing. The inner diameter of the spherical washer 8 is larger than the outer diameter of the thread of the lead screw 6. One end of the nut 9 is a spherical surface that mates with the spherical washer 8, and the inner diameter of the nut 9 is a thread that mates with the lead screw 6.

[0047] The lead screw 6 has a stepped lower section, with a positioning section at the top and bottom of the largest diameter step. The lower positioning section is installed in the frame 2 via a sleeve 12, and the upper positioning section is installed on the frame 2 via a pressure cap 11. The lead screw 6 is positioned on the frame 2 and can only rotate. The lead screw 6 has a threaded section that cooperates with the nut 9 to bear prestress. The top of the lead screw 6 is the drive section, which connects to the rolling mill pressing device and drives the lead screw 6 to rotate and adjust the position of the upper bearing seat 3. The sealing sleeve 10 is fixedly installed on the pressure cap 11, and there is a small gap between its inner and outer rings and the upper bearing seat 3 and the nut 9 to prevent foreign objects from entering.

[0048] After the upper bearing seat 3 is adjusted to the correct position, the prestress cylinders 1 on both sides apply a prestress greater than the rolling force. The lead screw 6 and the spherical pad are under pressure. Since they have already been subjected to a prestress greater than the rolling force, no part except the rolls will bounce or deform during rolling, which greatly improves the rolling accuracy of the product.

[0049] The lower bearing housing 4 is connected to the frame 2 by adjusting the hydraulic cylinder 5. The hydraulic cylinder drive can ensure that the lower bearing housing 4 has the characteristics of fast response speed and high precision.

[0050] Slide plates 7 are provided between the upper bearing housing 3 and the lower bearing housing 4 and the frame 2 to facilitate adjustment of the clearance and replacement after wear.

[0051] Since the rolls rotate, direct positioning is difficult. As a further improvement to this invention, such as... Figures 4 to 6 As shown, an anti-axial movement mechanism is installed on the bearing housing that is integrated with the roll. By setting a flexible anti-axial movement mechanism at the center of the bearing housing, the axial movement of the roll can be prevented, thus improving product accuracy. At the same time, the roll can be allowed to bend and deform. The flexible connection method improves the working conditions of the rolling mill and extends its service life.

[0052] The flexible anti-shaft movement mechanism for the rolls includes at least: bearing housing 2, frame 3, slide plate 7, cover 35, pressure plate 36, slider 37, sleeve 38, positioning pin 39, and screws, etc.

[0053] The roll and bearing housing 3 are axially connected as one unit. A sliding plate 7 is provided between the bearing housing and the frame 2 for precise adjustment of the sliding clearance and for easy replacement.

[0054] A rectangular guide groove is provided on the frame 2 at the center of the corresponding bearing seat 3, and the rolling mill roll system (rolls, bearing seats, etc.) can be adjusted relative to the frame as needed.

[0055] Locating pin 39 is a stepped shaft, such as Figure 8 As shown, one side is fixedly installed on both sides of the bearing housing 3 by screws, and the sleeve 38 is installed on the shaft on the other side of the positioning pin 39 by the pressure plate 36 and screws. The length of the sleeve 38 is greater than the length of the corresponding section of the positioning pin 39.

[0056] Slider 37 has two relative settings, such as Figure 7 As shown, its external shape is rectangular with a circular hole in the middle. The center of the circular hole is outside the slider 37, and the arc segment is smaller than a semicircle for easy installation. The length of the slider 37 is less than the length of the sleeve 38, and the pressure plate 36 does not lock the slider 37.

[0057] The installation process of the flexible anti-shaft movement mechanism for the rolls is as follows:

[0058] 1) After the slide plate 7 is installed on the bearing seat 3, it is installed in the frame 2 as a whole;

[0059] 2) Adjust the bearing housing 3 to the position of the rectangular guide groove of the frame 2, and install the positioning pin 39 on the bearing housing 3;

[0060] 3) Install sleeve 38 on positioning pin 39, and then install two sliders 37 from the rectangular guide slot of frame 3 between frame and sleeve 38;

[0061] 4) Install the pressure plate 36. Since the length of the sleeve 38 is greater than the length of the corresponding section of the positioning pin 39, and the length of the slider 37 is less than the length of the sleeve 38, the sleeve 38 is locked and the slider 37 is not locked.

[0062] 5) Install cover 35 on frame 3 to prevent debris from entering.

[0063] 6. After the sleeve 38 and two sliders 37 are installed on the positioning pin 39, the overall radial width is matched with the width of the rectangular guide groove on the frame 2, with a slight gap, which prevents the entire roller system from moving around, while also allowing the entire roller system to be adjusted relative to the frame.

[0064] The aforementioned flexible anti-shaft movement mechanism for the rolls causes the rolls to rotate around the center of the bearing housing under radial rolling force (the slider 37 is installed in the frame 2 and does not rotate on its own, but rotates relative to the sleeve 38). The flexible connection improves the working conditions of the equipment.

[0065] The high-precision co-rotating roll adjustment mechanism includes at least: a drive device 131, two primary worm gear reducers 132, four secondary worm gear reducers 133, a connecting assembly 134, and an output sleeve 135.

[0066] The two first-stage worm gear reducers 132 each include a worm 132.1 and a worm wheel 132.2. The two worms 132.1 are connected together by a connecting assembly 134 and are driven to rotate synchronously by a drive device 131.

[0067] The worm gears 132.2 of the two first-stage worm gear reducers 132 are hollow sleeves in the middle, and are connected to the worms 133.1 in the second-stage worm gear reducers 133 on both sides respectively.

[0068] The four secondary worm gear reducers 133 each include a worm gear 133.1 and a worm 133.2, wherein the worm gear 133.1 is connected to the output sleeve 135 by means of a key or the like;

[0069] The drive device 131 drives two worm gears 132.1 to rotate, which in turn drives four worm gears 133.1 to rotate, which in turn drives four output sleeves 135 to rotate.

[0070] The orientational arrangement characteristics of each stage of the worm gear pair are as follows:

[0071] 1) The worm gears in the two first-stage worm gear reducers 132 are in the same position, such as the worm on top and the worm gear on the bottom, so the rotation direction of the two worm gears 132.2 is the same;

[0072] 2) The worm gears in the four secondary worm gear reducers 133 are in the same orientation. For example, the worm is on the left and the worm gear is on the right. Therefore, the rotation direction of the four worm gears 133.2 is the same, and the rotation direction of the final output sleeve 135 is also the same.

[0073] In summary, by setting up a two-stage worm gear transmission mechanism, the speed ratio is significantly increased compared to spur gear pairs and helical gear pairs, thus improving the adjustment accuracy of the rolls. Simultaneously, the optimized arrangement of the worm gear pairs ensures that the final output sleeves all rotate in the same direction, and only one type of paired lead screw and nut is required, reducing the number of equipment types and spare parts, saving investment, and facilitating the overall assembly of the rolling mill.

[0074] The present invention has been described in detail above with reference to the accompanying drawings. However, the present invention is not limited to the embodiments described above. Within the scope of knowledge possessed by those skilled in the art, various changes can be made without departing from the spirit of the present invention. Many other changes and modifications made without departing from the concept and scope of the present invention should be considered within the scope of protection of the present invention.

[0075] In the description of this specification, specific features, structures, materials, or characteristics may be combined in any suitable manner in one or more embodiments or examples.

[0076] The above description is merely a specific embodiment of the present invention, but the scope of protection of the present invention is not limited thereto. Any variations or substitutions that can be easily conceived by those skilled in the art within the technical scope disclosed in the present invention should be included within the scope of protection of the present invention. Therefore, the scope of protection of the present invention should be determined by the scope of the claims.

Claims

1. A high-precision, same-direction roll adjustment mechanism, characterized in that, include: Two symmetrically arranged frames; each frame has bearing seat adjustment devices installed on both sides corresponding to the bearing seats. Two two-stage worm gear reducers are provided on the top of each frame corresponding to the bearing seat adjustment device; A primary worm gear reducer is installed between the two secondary worm gear reducers on each frame; The worms of the two single-stage worm gear reducers are connected together by a connecting assembly to connect the drive unit; The worm wheel of each first-stage worm gear reducer extends axially to both sides and is coaxially set with the worm of the corresponding second-stage worm gear reducer. The worm gear in each two-stage worm gear reducer is connected to the bearing housing adjustment device.

2. A prestressed rolling mill, characterized in that, Includes two symmetrically arranged racks; Prestressing cylinders and adjusting hydraulic cylinders are respectively installed on the upper and lower beams of each frame; Bearing seats are respectively provided at the free ends of the prestressing cylinder and the adjusting hydraulic cylinder; wherein, the prestressing cylinder is used to provide prestress to the bearing seats; and the adjusting hydraulic cylinder is used to drive the bearing seats to slide up and down. On the frames on both sides of the prestressed cylinder, there are upper bearing seat adjustment devices installed on both sides of the bearing seats to adjust the vertical position of the upper bearing seats. The rolls are mounted on two corresponding bearing seats; The high-precision co-rotating roll adjustment mechanism as described in claim 1 is installed on the two frames.

3. The prestressed rolling mill as described in claim 2, characterized in that, A prestressing cylinder is installed on the upper beam of each frame, and the drive shaft of the prestressing cylinder extends downward from the upper beam and is located below the upper beam; An upper bearing seat is slidably disposed in the frame below the prestressed cylinder, corresponding to the drive shaft; the drive shaft of the prestressed cylinder is connected to the upper bearing seat to provide prestress to the upper bearing seat. On the frames on both sides of the prestressed cylinder, there are upper bearing seat adjustment devices installed on both sides of the upper bearing seat to adjust the upper and lower positions of the upper bearing seat. An adjusting hydraulic cylinder is provided on the lower beam of each frame, and the drive shaft of the adjusting hydraulic cylinder extends upward from the lower beam and is located above the lower beam; a lower bearing seat is slidably arranged in the frame below the upper bearing seat; the drive shaft of the adjusting hydraulic cylinder is connected to the lower bearing seat to drive the lower bearing seat to slide up and down. The upper roll is mounted on two upper bearing seats; the lower roll is mounted on two lower bearing seats.

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