Quick-response high-precision pre-stressed rolling mill and rolling mill rack

Abstract

The invention discloses a quick-response high-precision pre-stressed rolling mill and a rolling mill stand. Comprising two racks which are symmetrically arranged; the two racks are positioned and connected through the rack connecting and positioning mechanism; a prestress cylinder is arranged on an upper beam of each rack, and an adjusting hydraulic cylinder is arranged on a lower beam of each rack; or, an adjusting hydraulic cylinder is arranged on the upper beam of each rack, and a prestress cylinder is arranged on the lower beam of each rack; bearing seats are respectively arranged at the free ends of the prestress cylinder and the adjusting hydraulic cylinder; wherein the pre-stress cylinder is used for providing pre-stress for the bearing seat; the adjusting hydraulic cylinder is used for driving the bearing seat to slide up and down; bearing seat adjusting devices are mounted on the rack on the two sides of the prestress cylinder and correspond to the two sides of the bearing seats, and are used for adjusting the vertical positions of the corresponding bearing seats; and the rollers are arranged on the two bearing seats which are correspondingly arranged. The rolling precision is high, and the adjustment requirement of the rolling mill roll gap can be met through rapid and accurate adjustment of the lower bearing seat on line.

Description

Technical Field

[0001] This invention relates to a fast-response, high-precision prestressed rolling mill and a mill stand. Background Technology

[0002] Rolling mills are the core equipment for the metal rolling process. The core rolls of the mill are installed in the stands. Traditional arch-type rolling mills and reducing mills both have arch-type stands. During production, the two stands on both sides of the mill must be tightly connected and accurately positioned. Otherwise, the rolls will get stuck when adjusted in the window formed by the two stands. When changing rolls, the two sides need to be pulled apart. Therefore, the connection between the two stands must be reliable, accurately positioned, and able to be quickly disengaged. However, a tight connection often makes disengagement difficult and requires external force. Traditionally, a tie rod connection is used, which requires nuts to be installed at the ends of the tie rods. Large nuts are inconvenient to install and remove, involve a large workload, and are difficult to guarantee the locking torque, resulting in low reliability. Disengaging the two stands requires external force, which is inconvenient. Summary of the Invention

[0003] To overcome the above-mentioned defects, the present invention provides a fast-response, high-precision prestressed rolling mill and a rolling mill stand.

[0004] To achieve the above objectives, the present invention provides a fast-response high-precision prestressed rolling mill, comprising two symmetrically arranged frames; the two frames are positioned and connected by a frame connection and positioning mechanism.

[0005] Each frame is equipped with a prestressing cylinder on the upper beam and an adjusting hydraulic cylinder on the lower beam; or, each frame is equipped with an adjusting hydraulic cylinder on the upper beam and a prestressing cylinder on the lower beam.

[0006] 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.

[0007] Bearing seat adjustment devices are installed on both sides of the frame on both sides of the prestressed cylinder, corresponding to the bearing seats, to adjust the vertical position of the corresponding bearing seats.

[0008] The rolls are mounted on two corresponding bearing seats.

[0009] Furthermore, the frame connection and positioning mechanism includes:

[0010] The frame is a frame structure with crossbeams at both the top and bottom.

[0011] Four tie rod holes are provided on both the top and bottom sides of each frame, and tie rods are installed in the tie rod holes; the two frames are connected by the four tie rods.

[0012] A locating pin is interference-fitted into the tie rod hole at a frame mating surface; the inner diameter of the locating pin is larger than the diameter of the tie rod.

[0013] A positioning sleeve is interference-fitted into the tie rod hole at another frame mating surface; the inner diameter of the positioning sleeve is transitionally connected to the outer diameter of the positioning pin.

[0014] Furthermore, action blocks are provided on both sides of one frame; release cylinders are provided on both sides of the other frame corresponding to the action blocks; wherein, the stroke of the piston rod of the release cylinder is greater than the matching length between the positioning pin and the positioning sleeve, and when the piston rod is fully extended, the positioning pin and the positioning sleeve are completely separated.

[0015] Furthermore, a nut is provided at one end of the pull rod, and a hydraulic nut is provided at the other end.

[0016] To achieve the above objectives, the rolling mill frame of the present invention comprises two symmetrically arranged frames; the two frames are connected and positioned by a frame connection and positioning mechanism.

[0017] The frame connection and positioning mechanism includes:

[0018] The frame is a frame structure with crossbeams at both the top and bottom.

[0019] Four tie rod holes are provided on both the top and bottom sides of each frame, and tie rods are installed in the tie rod holes; the two frames are connected by the four tie rods.

[0020] A locating pin is interference-fitted into the tie rod hole at a frame mating surface; the inner diameter of the locating pin is larger than the diameter of the tie rod.

[0021] A positioning sleeve is interference-fitted into the tie rod hole at another frame mating surface; the inner diameter of the positioning sleeve is transitionally connected to the outer diameter of the positioning pin.

[0022] Furthermore, action blocks are provided on both sides of one frame; release cylinders are provided on both sides of the other frame corresponding to the action blocks; wherein, the stroke of the piston rod of the release cylinder is greater than the matching length between the positioning pin and the positioning sleeve, and when the piston rod is fully extended, the positioning pin and the positioning sleeve are completely separated.

[0023] Furthermore, a nut is provided at one end of the pull rod, and a hydraulic nut is provided at the other end.

[0024] This invention solves the problems of cumbersome locking operations and low efficiency in connecting the two frames by setting a hydraulic nut on one side. This solution requires no pressure holding during operation and is safe and reliable. The addition of a release cylinder allows the two frames to be easily disengaged even when precisely positioned and tightly connected, without the need for external force, making operation convenient. Furthermore, the upper prestressing cylinder provides prestress greater than the rolling force to the upper bearing seat, keeping the adjustment device under pressure; therefore, during rolling, no bouncing deformation occurs except for the rolls, greatly improving product rolling accuracy. The bearing seat is connected to the frame via an adjusting hydraulic cylinder, and the hydraulic cylinder drive ensures that the lower bearing seat has fast response speed and high precision. In summary, this invention simultaneously offers high rolling accuracy, allowing for rapid and precise online adjustment of the lower bearing seat to meet the mill roll gap adjustment requirements. In addition, the elevation of the rolling centerline can be flexibly adjusted in advance as needed, facilitating the bite of steel billets of various specifications and reducing the occurrence of impacts and steel piling accidents during the rolling process. Attached Figure Description

[0025] 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.

[0026] 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.

[0027] Figure 3 for Figure 2 The diagram shows a fast-response high-precision prestressed rolling mill after the rolls are installed.

[0028] Figure 4 This is a schematic diagram of the flexible anti-shaft movement mechanism for the rolls in this invention.

[0029] Figure 5 for Figure 4 A horizontal cross-sectional view.

[0030] Figure 6 for Figure 5 A partial sectional view.

[0031] Figure 7 This is a side view and a front view of a slider.

[0032] Figure 8 These are the side and front views of the locating pin.

[0033] Figure 9 This is a schematic diagram of the deformation of a rolling mill roll under stress.

[0034] Figure 10 This is a schematic diagram showing the connection and disconnection states of the rolling mill stand according to the present invention.

[0035] Figure 11for Figure 10 A cross-sectional view.

[0036] Figure 12 A schematic diagram showing the retracted and extended states of the (hydraulic) cylinder.

[0037] Figure 13 This is a schematic diagram of the hydraulic nut. Detailed Implementation

[0038] The embodiments of the present invention will now be described in detail with reference to the accompanying drawings.

[0039] 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.

[0040] 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.

[0041] 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.

[0042] The high-precision rolling mill of this invention with rapid response comprises upper and lower roll systems. One roll system's bearing housing is connected to the lead screw via a nut, and prestress is applied to the bearing housing by a prestressing hydraulic cylinder to achieve a prestressed structure and improve rolling accuracy. The other roll system's bearing housing is positioned by an adjusting hydraulic cylinder, enabling rapid and accurate online adjustment of the roll position. The prestressing hydraulic cylinder can be installed on either the upper or lower beam of the mill stand; correspondingly, the adjusting hydraulic cylinder can be installed on either the upper or lower beam of the mill stand.

[0043] 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.

[0044] like Figure 1 As shown, the frame 2 includes an operating side frame and a transmission side frame. The frame 2 is a frame structure with crossbeams at both the upper and lower parts, and positioning mechanisms are located at both the upper and lower crossbeams. The two frames can be connected together through the positioning mechanisms.

[0045] 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.

[0046] 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.

[0047] 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.

[0048] 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.

[0049] 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.

[0050] 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.

[0051] 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.

[0052] 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.

[0053] 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.

[0054] 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.

[0055] 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.

[0056] 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.

[0057] 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.

[0058] The installation process of the flexible anti-shaft movement mechanism for the rolls is as follows:

[0059] 1) After the slide plate 7 is installed on the bearing seat 3, it is installed in the frame 2 as a whole;

[0060] 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;

[0061] 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;

[0062] 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.

[0063] 5) Install cover 35 on frame 3 to prevent debris from entering.

[0064] 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.

[0065] 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.

[0066] The aforementioned positioning mechanism for rack connection, such as Figures 10 to 13 As shown, it includes: nut 21, operating side frame 22, actuating block 23, disengagement cylinder 24, transmission side frame 25, hydraulic nut 26, pull rod 27, positioning pin 28, and positioning sleeve 29.

[0067] Both the operating side frame 22 and the transmission side frame 25 are frame structures, with crossbeams at the top and bottom. The positioning mechanism is located at the joint surface of the crossbeams. Both the operating side frame 22 and the transmission side frame 25 have four through holes on their upper and lower sides for mounting the tie rod 7.

[0068] The hydraulic nut 26 includes an outer ring 26.1, an inner threaded sleeve 26.2, a locking nut 26.3, and a sealing ring, etc., with an oil inlet on the outer ring 26.1.

[0069] The connection between the operating side frame 22 and the transmission side frame 25 is achieved through 24 tie rods 27. Both sides of each tie rod 27 are provided with threaded sections, and the tie rod 27 is provided with a keyway on the transmission side. After the key is installed, it mates with the keyway at the corresponding position on the transmission side frame 25 to prevent the tie rod 27 from rotating during operation.

[0070] Connection and locking steps: Nut 21 is attached to the operating side frame 22 and connected to the operating side threaded section on the pull rod 27. The outer ring 26.1 of nut 26 is attached to the transmission side frame 5, and the inner threaded sleeve 26.2 is connected to the transmission side threaded section on the pull rod 27. After hydraulic oil is injected through the outer ring 26.1, the inner threaded sleeve 26.2 is pushed to move, stretching the pull rod 27. Then, tighten the locking nut 26.3 to lock both sides of the frame. After locking, the pressure can be released without holding the pressure.

[0071] When the two frames need to be separated, inject higher pressure hydraulic oil from the outer ring 26.1. A gap will be formed between the locking nut 26.3 and the outer ring 26.1, which can easily loosen the locking nut 26.3 and depressurize the hydraulic nut 26. After depressurization, remove the nut 1 on the operating side frame 22, and the two frames can be pulled apart.

[0072] The positioning pin 28 is interference-fitted onto the operating side frame 22, and its inner hole is directly larger than the diameter of the pull rod 27. The positioning sleeve 29 is interference-fitted onto the transmission side frame 25, and the inner diameter of the positioning sleeve 29 is transitionally connected to the outer diameter of the positioning pin 28, which can very accurately position the frame on both sides.

[0073] The release cylinder 24 includes a stopper rod 24.1, a disc spring assembly 24.2, and a cylinder body 24.3. The release cylinder 24 is mounted as a whole on the transmission side frame 25, which is provided with mounting steps for positioning the release cylinder 24 and bearing the reaction force of the release cylinder 24.

[0074] During operation, the two frames are connected together, and the piston rod 24.1 is in a retracted state under the action of the disc spring assembly 24.2, without contacting other components. When the two frames need to be separated, hydraulic oil is injected from the tail of the cylinder 24.3 to overcome the elasticity of the disc spring assembly 24.2, pushing the piston rod 24.1 out and pressing against the action block 23 mounted on the operating side frame 22, thus pulling the two frames apart. The stroke of the piston rod 24.1 is greater than the mating length of the positioning pin 28 and the positioning sleeve 29. When the piston rod 24.1 is fully extended, the positioning pin 28 and the positioning sleeve 29 are completely separated, after which the two frames can be easily pulled apart to change the rolls.

[0075] The technical solution addresses the problems of cumbersome locking operations and low work efficiency associated with connecting and locking the two side frames by installing a hydraulic nut on one side. This solution requires no pressure holding during operation and is safe and reliable. Furthermore, the inclusion of a release cylinder allows the two side frames to be easily disengaged even when precisely positioned and tightly connected, without the need for external force, making operation convenient.

[0076] 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.

[0077] 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.

[0078] 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 fast-response, high-precision prestressed rolling mill, characterized in that, It includes two symmetrically arranged racks; the two racks are connected and positioned by a rack connection and positioning mechanism. A prestressing cylinder is installed on the upper beam of each frame, and an adjusting hydraulic cylinder is installed on the lower beam; or, an adjusting hydraulic cylinder is installed on the upper beam of each frame, and a prestressing cylinder is installed on the lower beam. 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 bearing seat adjustment devices installed on both sides of the bearing seats to adjust the vertical position of the corresponding bearing seats. The rolls are mounted on two corresponding bearing seats.

2. The fast-response high-precision prestressed rolling mill as described in claim 1, characterized in that, The frame connection and positioning mechanism includes: The frame is a frame structure with crossbeams at both the top and bottom. Four tie rod holes are provided on both the top and bottom sides of each frame, and tie rods are installed in the tie rod holes; the two frames are connected by the four tie rods. A locating pin is interference-fitted into the tie rod hole at a frame mating surface; the inner diameter of the locating pin is larger than the diameter of the tie rod. A positioning sleeve is interference-fitted into the tie rod hole at another frame mating surface; the inner diameter of the positioning sleeve is transitionally connected to the outer diameter of the positioning pin.

3. The fast-response high-precision prestressed rolling mill as described in claim 2, characterized in that, Actuating blocks are provided on both sides of one frame; disengagement cylinders are provided on both sides of the other frame corresponding to the actuating blocks; wherein, the stroke of the piston rod of the disengagement cylinder is greater than the mating length between the positioning pin and the positioning sleeve, and when the piston rod is fully extended, the positioning pin and the positioning sleeve are completely separated.

4. The fast-response high-precision prestressed rolling mill as described in claim 2, characterized in that, One end of the pull rod is equipped with a nut, and the other end is equipped with a hydraulic nut.

5. A rolling mill stand, characterized in that, The rolling mill stand consists of two stands arranged symmetrically. The two frames are positioned and connected by a frame connection and positioning mechanism; The frame connection and positioning mechanism includes: The frame is a frame structure with crossbeams at both the top and bottom. Four tie rod holes are provided on both the top and bottom sides of each frame, and tie rods are installed in the tie rod holes; the two frames are connected by the four tie rods. A locating pin is interference-fitted into the tie rod hole at a frame mating surface; the inner diameter of the locating pin is larger than the diameter of the tie rod. A positioning sleeve is interference-fitted into the tie rod hole at another frame mating surface; the inner diameter of the positioning sleeve is transitionally connected to the outer diameter of the positioning pin.

6. The rolling mill stand as described in claim 5, characterized in that, Actuating blocks are provided on both sides of one frame; disengagement cylinders are provided on both sides of the other frame corresponding to the actuating blocks; wherein, the stroke of the piston rod of the disengagement cylinder is greater than the mating length between the positioning pin and the positioning sleeve, and when the piston rod is fully extended, the positioning pin and the positioning sleeve are completely separated.

7. The rolling mill stand as described in claim 6, characterized in that, One end of the pull rod is equipped with a nut, and the other end is equipped with a hydraulic nut.

Images