Flexible connecting device for roller bearing seat, quick-response high-precision pre-stress rolling mill and control method

Abstract

The invention discloses a roll bearing seat flexible connecting device, a quick-response high-precision pre-stress rolling mill and a control method. Comprising a frame type rack, and a roller bearing seat is arranged in the rack; a double-piston-rod hydraulic cylinder is arranged on an upper beam and / or a lower beam of the frame type rack; a connecting rod penetrates through a piston rod of the hydraulic cylinder; a concave-convex combined spherical pad sleeves one end, close to the bearing seat, of the connecting rod; the concave spherical pad is positioned on one side far away from the bearing seat, and the convex spherical pad is positioned on one side close to the bearing seat; the lower end of the connecting rod penetrates through the concave-convex combined spherical pad and the base to be connected to the roller bearing seat. The convex spherical pad can twist along with the bearing seat; the end, far away from the bearing seat, of the connecting rod extends upwards out of the rack and is in threaded connection with a nut, and the connecting rod between the nut and the rack is sleeved with a spring. According to the device, the combined spherical pad is arranged between the hydraulic cylinder and the bearing seat, so that the hydraulic cylinder and the bearing seat are flexibly connected, and the effect of protecting the hydraulic cylinder is achieved.

Description

Technical Field

[0001] This invention relates to a novel flexible connection device for roll bearing housings, a fast-response high-precision prestressed rolling mill, and a control method. Background Technology

[0002] Rolling mills are the core equipment in the metal rolling process. The primary indicators for measuring mill performance are its rigidity and rolling bounce, which are essential prerequisites for ensuring product precision. Furthermore, the roll gap needs to be adjusted quickly and precisely according to different rolling specifications and the wear of the rolls themselves. Especially with the current demands for automation and intelligence in rolling lines, the requirements for high precision and rapid response in roll gap adjustment are becoming increasingly important. Currently, the main types of rolling mills used in hot-rolled bar, wire, and section production lines include: archway-type rolling mills, short-stress line rolling mills, and prestressed rolling mills.

[0003] Among them, the archway-type rolling mill can precisely adjust the roll gap when using hydraulic control of the roll gap, but it has disadvantages such as large size, high cost, long stress line, and large deformation. It is mainly used for rolling large-size products.

[0004] Short stress line rolling mills have advantages such as short stress lines and small rolling deformation. However, conventional short stress line rolling mills use mechanical nut and screw methods to adjust the roll gap, which has poor adjustment accuracy, cannot automatically adjust the roll gap, and requires manual verification, resulting in low efficiency.

[0005] Short stress line rolling mills that adopt a fully hydraulic roll gap adjustment technology solution cannot be put into actual production application due to problems such as the synchronization of multiple actuators and excessive cost.

[0006] Prestressed rolling mills apply a prestress greater than the rolling force to the roll bearing housing before rolling, which can ensure that no bouncing occurs except for the rolls during rolling. It is the type of mill with the highest rolling precision. However, because of the prestress, this type of mill cannot meet the requirements for online automatic and precise adjustment of the roll gap.

[0007] Therefore, the present invention aims to explore a high-precision rolling mill with fast response. The rolling mill has the high precision characteristics of a prestressed rolling mill, and at the same time has the characteristics of fast roll gap adjustment response speed and high precision, so as to meet the development needs of high-precision rolling and the automation and intelligence of rolling lines. Summary of the Invention

[0008] To overcome the above-mentioned defects, the present invention provides a fast-response, high-precision prestressed rolling mill and control method.

[0009] To achieve the above objectives, the flexible connection device for the roll bearing housing of the present invention includes:

[0010] A frame-type machine frame, within which a roll bearing housing is provided;

[0011] A double piston rod hydraulic cylinder is provided on the upper beam and / or lower beam of the frame-type machine;

[0012] A connecting rod passes through the piston rod of the hydraulic cylinder;

[0013] The connecting rod is fitted with a concave-convex spherical pad at one end near the bearing housing; the center of the concave-convex spherical pad points towards the center of the bearing housing.

[0014] The concave spherical pad is located on the far side of the bearing housing, and the convex spherical pad is located on the near side of the bearing housing.

[0015] The lower end of the connecting rod passes through the concave-convex spherical pad and the base and connects to the roll bearing housing; the convex spherical pad can rotate with the bearing housing.

[0016] One end of the connecting rod far from the bearing housing extends upwards out of the frame, and a nut is screwed onto the other end of the connecting rod far from the bearing housing. A spring is fitted on the connecting rod between the nut and the frame.

[0017] This device achieves a flexible connection between the hydraulic cylinder and the bearing housing by setting a combined spherical pad between them. The bearing housing, the convex spherical pad, the concave spherical pad, and the hydraulic cylinder undergo relative torsion, so the vibration and deformation on the bearing housing will not be transmitted to the hydraulic cylinder, thus protecting the hydraulic cylinder, improving its working condition, and extending its service life.

[0018] To achieve the above objectives, the present invention provides a fast-response high-precision prestressed rolling mill, comprising two symmetrically arranged stands;

[0019] Prestressing cylinders and adjusting hydraulic cylinders are respectively installed on the upper and lower beams of each frame;

[0020] 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.

[0021] 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.

[0022] The rolls are mounted on two corresponding bearing seats;

[0023] The prestressing cylinder and / or adjusting hydraulic cylinder are double piston rod hydraulic cylinders;

[0024] A connecting rod passes through the piston rod of the hydraulic cylinder;

[0025] The connecting rod is fitted with a concave-convex spherical pad at one end near the bearing housing; the center of the concave-convex spherical pad points towards the center of the bearing housing.

[0026] The concave spherical pad is located on the far side of the bearing housing, and the convex spherical pad is located on the near side of the bearing housing.

[0027] The lower end of the connecting rod passes through the concave-convex spherical pad and the base and connects to the roll bearing housing; the convex spherical pad can rotate with the bearing housing.

[0028] One end of the connecting rod far from the bearing housing extends upwards out of the frame, and a nut is screwed onto the other end of the connecting rod far from the bearing housing. A spring is fitted on the connecting rod between the nut and the frame.

[0029] 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:

[0030] The position of the upper roll in the frame is adjusted using the upper bearing seat adjustment device;

[0031] 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.

[0032] Adjust the hydraulic cylinder to drive the lower bearing housing to the predetermined position in the frame.

[0033] 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

[0034] 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.

[0035] 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.

[0036] Figure 3 for Figure 2 The diagram shows a fast-response high-precision prestressed rolling mill after the rolls are installed.

[0037] Figure 4 This is a schematic diagram of the flexible anti-shaft movement mechanism for the rolls in this invention.

[0038] Figure 5 for Figure 4 A horizontal cross-sectional view.

[0039] Figure 6 for Figure 5 A partial sectional view.

[0040] Figure 7 This is a side view and a front view of a slider.

[0041] Figure 8 These are the side and front views of the locating pin.

[0042] Figure 9 This is a schematic diagram of the deformation of a rolling mill roll under stress.

[0043] Figure 10 This is a schematic diagram of the flexible connection device for the roll bearing housing. Detailed Implementation

[0044] The embodiments of the present invention will now be described in detail with reference to the accompanying drawings.

[0045] 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.

[0046] 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.

[0047] 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.

[0048] 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.

[0049] 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.

[0050] 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.

[0051] 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.

[0052] 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.

[0053] 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.

[0054] 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.

[0055] 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.

[0056] 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.

[0057] 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.

[0058] 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.

[0059] 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.

[0060] 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.

[0061] 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.

[0062] 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.

[0063] 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.

[0064] The installation process of the flexible anti-shaft movement mechanism for the rolls is as follows:

[0065] 1) After the slide plate 7 is installed on the bearing seat 3, it is installed in the frame 2 as a whole;

[0066] 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;

[0067] 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;

[0068] 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.

[0069] 5) Install cover 35 on frame 3 to prevent debris from entering.

[0070] 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.

[0071] 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.

[0072] Figure 10 The diagram shown is a schematic of the flexible connection mechanism of the bearing seat of the present invention, including: bearing seat 3 (4), base 52, spherical pad 1 53, spherical pad 2 54, frame 2, cylinder 56.1, piston rod 56.2, cylinder base 56.3, nut 57, cover 58, pad 59, disc spring assembly 510, connecting rod 511, pin 512, etc.

[0073] The bearing housing 1 is connected to the roll as a whole (roll system), and is installed in the frame 2 on both sides. The position can be adjusted up and down in the frame 2 as needed under the drive of hydraulic cylinders 1 and 5.

[0074] The hydraulic cylinders 1 and 5 include a cylinder barrel 56.1, a piston rod 56.2, and a cylinder base 56.3. The hydraulic cylinder 56 is mounted on the frame 2. The piston rod 56.2 passes vertically through the cylinder barrel 56.1 and the cylinder base 56.3, and is a double piston rod type. The piston rod 56.2 has a hollow structure.

[0075] The convex spherical pad 53 and the concave spherical pad 54 are a pair of mating spherical pads with their common center pointing towards the center of the bearing housing. The convex spherical pad 53 can rotate together with the bearing housing.

[0076] The base 52 is mounted on the bearing housing by screws, and the lower part of the connecting rod 511 is connected to the bearing housing by pin 512. The convex spherical pad 53 and the concave spherical pad 54 are installed between the base 52 and the piston rod 56.2.

[0077] At the other end of the piston rod 56.2, a disc spring assembly 510 is provided between the two pads 59, and the disc spring assembly 510 is locked to the threaded section at the top of the connecting rod 511 by a nut 57. The mechanism connects the bearing housing, hydraulic cylinder, convex spherical pad 53 and concave spherical pad 54 together via the connecting rod 511.

[0078] This device controls the height of the disc spring assembly 510 and the spring force generated by controlling the tightening amount of the nut 57. When the spring force of the disc spring assembly 510 is greater than the weight of the roller system, the roller system is "lifted", which can eliminate the connection gap between the connecting rod 511 and the bearing seat and improve the rolling accuracy.

[0079] This device achieves a flexible connection between the hydraulic cylinder and the bearing housing by setting a combined spherical pad between them. The bearing housing, the convex spherical pad 53 and the concave spherical pad 54, and the hydraulic cylinder undergo relative torsion, so the vibration and deformation on the bearing housing will not be transmitted to the hydraulic cylinder, thus protecting the hydraulic cylinder, improving the working condition of the hydraulic cylinder, and increasing its service life.

[0080] 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.

[0081] 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.

[0082] 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 flexible connection device for a rolling mill bearing housing, characterized in that, include: A frame-type machine frame, within which a roll bearing housing is provided; A double piston rod hydraulic cylinder is provided on the upper beam and / or lower beam of the frame-type machine; A connecting rod passes through the piston rod of the hydraulic cylinder; The connecting rod is fitted with a concave-convex spherical pad at one end near the bearing housing; the center of the concave-convex spherical pad points towards the center of the bearing housing. The concave spherical pad is located on the far side of the bearing housing, and the convex spherical pad is located on the near side of the bearing housing. The lower end of the connecting rod passes through the concave-convex spherical pad and the base and connects to the roll bearing housing; the convex spherical pad can rotate with the bearing housing. One end of the connecting rod far from the bearing housing extends upwards out of the frame, and a nut is screwed onto the other end of the connecting rod far from the bearing housing. A spring is fitted on the connecting rod between the nut and the frame.

2. A fast-response, high-precision 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 prestressing cylinder and / or adjusting hydraulic cylinder are double piston rod hydraulic cylinders; A connecting rod passes through the piston rod of the hydraulic cylinder; The connecting rod is fitted with a concave-convex spherical pad at one end near the bearing housing; the center of the concave-convex spherical pad points towards the center of the bearing housing. The concave spherical pad is located on the far side of the bearing housing, and the convex spherical pad is located on the near side of the bearing housing. The lower end of the connecting rod passes through the concave-convex spherical pad and the base and connects to the roll bearing housing; the convex spherical pad can rotate with the bearing housing. One end of the connecting rod far from the bearing housing extends upwards out of the frame, and a nut is screwed onto the other end of the connecting rod far from the bearing housing. A spring is fitted on the connecting rod between the nut and the frame.

3. A control method for a fast-response high-precision prestressed rolling mill, the method being implemented based on the fast-response high-precision prestressed rolling mill as described in claim 2, characterized in that... Includes the following steps: The position of the upper roll in the frame is adjusted using the upper bearing seat adjustment device; 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. Adjust the hydraulic cylinder to drive the lower bearing housing to the predetermined position in the frame.

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