A cold rolling mill roll lifting device and a cold rolling mill

Abstract

This utility model discloses a roll lifting device for a cold rolling mill and a cold rolling mill, relating to the technical field of cold rolling equipment for metal sheets. Specifically, it includes two sets of drive mechanisms, each comprising a worm gear transmission box, two power output worms, two drive screws, and two transmission worm wheels. The worm gear transmission boxes in the two sets of drive mechanisms are connected by a transmission shaft, and a drive motor is installed on the worm gear transmission box in one of the drive mechanisms. This utility model employs a lower-level drive lifting design, using two symmetrically designed worm gear mechanisms in conjunction with double screw transmission to directly push the upper roll bearing seat upwards. The force generated by the upper roll of the cold rolling mill is directly transmitted to the base of the cold rolling mill through the screws, beams, and roll frames, preventing the beams or crossbeams of the cold rolling mill from bearing excessive bending moments. Furthermore, the roll lifting mechanism is simple, time-saving, and labor-saving to maintain in the later stages.

Description

Technical Field

[0001] This utility model relates to the technical field of cold rolling equipment for metal sheets, specifically a roll lifting device for a cold rolling mill and a cold rolling mill. Background Technology

[0002] Twin-roll cold rolling mills are a common type of equipment in metal sheet rolling processes. When producing sheets of different thicknesses and specifications, the height of the rolls in the cold rolling mill needs to be adjusted.

[0003] Currently, in traditional twin-roll cold rolling mills, the roll lifting device typically employs an upper-drive structure design for roll raising and lowering. This means that the drive motor, reducer, and transmission mechanism are installed at the top of the mill, and the upper roll's bearing housing is raised and lowered via a long drive shaft or gearbox. However, this design still has several shortcomings: First, the drive mechanism is installed at the top of the mill, requiring external tools to be used for climbing or the roll to be hoisted during maintenance, which is quite inconvenient. Second, the drive mechanism is located at the top of the cold rolling mill frame, and the force generated by the downward pressure acts in the opposite direction on the top crossbeam of the frame, causing the crossbeam to bear excessive bending moment over a long period of time.

[0004] Therefore, we propose a cold rolling mill roll lifting device and a cold rolling mill with a lower-level drive. Utility Model Content

[0005] To address the shortcomings of existing technologies, this utility model provides a cold rolling mill roll lifting device and a cold rolling mill.

[0006] This utility model provides a cold rolling mill roll lifting device, including two sets of symmetrically arranged drive mechanisms and a beam frame set at the top of the two sets of drive mechanisms; wherein, each of the two sets of drive mechanisms includes a worm gear transmission box and two power output worms symmetrically arranged on both sides of the worm gear transmission box. In order to improve the stability of the power output worms, a first bearing with a seat is installed at the other end of the two power output worms.

[0007] Furthermore, the worm gear transmission boxes in the two sets of drive mechanisms are connected by a transmission shaft. One set of drive mechanisms has a drive motor mounted on its worm gear transmission box. This drive motor is a geared motor. One end of each of the two power output worms in the same set of drive mechanisms is integrally formed at the worm wheel shaft in the worm gear transmission box. The rotation of the worm wheel in the worm gear transmission box synchronously drives the rotation of the power output worms on both sides. To further explain, the two ends of the transmission shaft are respectively installed on the ends of the worms in the two worm gear transmission boxes, while the output shaft of the drive motor is connected to the other end of the worm in one of the worm gear transmission boxes. While the drive motor drives the worm gear transmission box in this set of drive mechanisms to move, it also synchronously drives the worm gear transmission box in the other set of drive mechanisms to move synchronously through the transmission shaft.

[0008] Furthermore, each set of drive mechanisms also includes two drive screws that are respectively mounted upright on the sides of the two power output worm gears via second seated bearings. At the bottom of each of the two drive screws is a transmission worm wheel that cooperates with the power output worm gear. The tops of the two drive screws in the same set of drive mechanisms are rotatably mounted on the beam frame via positioning bearings. The rotation of the power output worm gear drives the rotation of the transmission worm wheel, thereby causing the drive screw to rotate. During the entire drive process, the power output by the drive motor is initially reduced in speed by the worm gear transmission box, and then undergoes a secondary speed reduction through the power output worm gear and transmission worm wheel to obtain greater output torque. This ensures that the upper roll body can move smoothly up and down under the coordination of the two pairs of drive screws. To prevent axial displacement of the drive screws, both the second seated bearing and the positioning bearing are roller shaft thrust bearings.

[0009] Furthermore, an upper roll bearing seat and a lower roll bearing seat for mounting the cold rolling roll body are respectively installed between the two drive screws in the same set of drive mechanisms, and a cold rolling roll body is installed between the upper roll bearing seat and the lower roll bearing seat installed on each of the two sets of drive mechanisms.

[0010] Furthermore, to avoid affecting the lower roll when adjusting the upper roll of the cold rolling mill, the upper end of the drive screw is a screw end, and the lower end is a sliding rod end. The two sides of the lower roll bearing housing are slidably fitted onto the sliding rod end of the drive screw, while the two sides of the upper roll bearing housing are fitted onto the screw end of the drive screw, forming a screw transmission mechanism. Additionally, a positioning sleeve is slidably fitted in the middle of the drive screw to separate the sliding rod end and the screw end. This positioning sleeve positions the middle section of the drive screw, improving its stability and allowing for real-time positioning of the lower roll bearing housing.

[0011] Furthermore, the transmission worm gear is connected to the bottom of the drive screw by a key, and a locking nut is installed on the drive screw thread at the top of the transmission worm gear. The locking nut presses the transmission worm gear against the key connection at the bottom of the drive screw, which not only positions the transmission worm gear but also facilitates future replacement and maintenance.

[0012] Furthermore, to improve the stability of the upper roll bearing housing during lifting and lowering, a guide rod is vertically fixed at the middle position of the top of the upper roll bearing housing, driven by the drive screw. The top of the guide rod slides through the beam frame. At the same time, to improve the stability of the assembly between the upper roll bearing housing and the two drive screws, the surface of the guide rod near the upper roll bearing housing is threaded and screwed with an adjusting nut. A spring fitted outside the guide rod is provided between the adjusting nut and the beam frame. This spring is a high-strength spring. The main function of the spring is to apply force downward from above the cold rolling roll body to offset part of the rolling force, thereby reducing the force between the drive screw and the upper roll bearing housing, thus preventing wear on the screw threads on the drive screw. When adjusting the height of the upper roll in the cold rolling mill, the adjusting nut can be loosened to adjust the elastic stress of the spring.

[0013] In addition, the worm gear transmission boxes, power output worm, transmission worm wheel and drive screw in the two sets of drive mechanisms are all made of high-precision and high-strength metal parts, and the drive screws in the two sets of drive mechanisms rotate synchronously at the same speed during operation.

[0014] A cold rolling mill includes the aforementioned cold rolling mill roll lifting device, and further includes two roll frames installed outside two sets of drive mechanisms in the cold rolling mill roll lifting device. The roll frames are H-shaped, wherein the sliding rod ends of the two drive screws in the drive mechanisms pass through the supporting beam column in the middle of the roll frame and are rotatably engaged with the supporting beam column via bearings. The bottom of the lower roll bearing seat presses against the supporting beam column in the middle of the roll frame, and the top of the lower roll bearing seat is positioned by a positioning bushing. The positioning bushing in the cold rolling mill roll lifting device is fixed to the side wall of the roll frame. The beam frame in the cold rolling mill roll lifting device is fixedly installed at the top of the roll frame. It should be noted that, in order to improve the stability of the entire roll frame, a crossbeam (not shown) can be installed between the two beam frames to connect the tops of the two roll frames together. A protective cover is installed at the bottom between the two roll frames to protect the drive shaft in the cold rolling mill roll lifting device. For further dust prevention, dust covers (not shown) can also be installed on the sides of the two roll frames to cover the power output worm and transmission worm wheel in the drive mechanism.

[0015] Compared with the prior art, the beneficial effects of this utility model are as follows:

[0016] Unlike traditional cold rolling mills, this invention features a lower-drive lifting mechanism for the roll lifting mechanism. Compared to traditional upper-drive lifting mechanisms, the drive mechanism is installed at the bottom of the cold rolling mill. Through two sets of symmetrically designed worm gears and double screw drives, it directly pushes the upper roll bearing seat upward. The force generated by the upper roll of the cold rolling mill is directly transmitted to the base of the cold rolling mill through the screw, beam frame, and roll frame, avoiding excessive bending moment on the beam frame or crossbeam of the cold rolling mill. In addition, with the lower-drive lifting design, maintenance personnel do not need to climb or hoist the rolls during later maintenance of the roll lifting mechanism, making the operation simple, time-saving, and labor-saving. Attached Figure Description

[0017] The accompanying drawings, which are included to provide a further understanding of this application and form part of this application, illustrate exemplary embodiments and are used to explain this application, but do not constitute an undue limitation of this application. In the drawings:

[0018] Figure 1 This is a schematic diagram of the structure of the cold rolling mill roll lifting device of this utility model. Figure 1 ;

[0019] Figure 2 This is a schematic diagram of the structure of the cold rolling mill roll lifting device of this utility model. Figure 2 ;

[0020] Figure 3 This is a schematic diagram of the drive mechanism in the cold rolling mill roll lifting device of this utility model;

[0021] Figure 4 This is a schematic diagram of the cold rolling mill of this utility model. Figure 1 ;

[0022] Figure 5 This is a schematic diagram of the cold rolling mill of this utility model. Figure 2 .

[0023] In the diagram: 1. Drive mechanism; 101. Worm gear transmission box; 102. Power output worm; 103. First bearing with mounting seat; 104. Second bearing with mounting seat; 105. Drive screw; 151. Slide rod end; 152. Screw end; 106. Transmission worm gear; 107. Locking nut; 2. Transmission shaft; 3. Drive motor; 4. Lower roll bearing seat; 5. Upper roll bearing seat; 6. Positioning bushing; 7. Cold rolling roll body; 8. Guide rod; 9. Spring; 10. Adjusting nut; 11. Positioning bearing; 12. Beam frame; 13. Roll frame; 14. Protective cover. Detailed Implementation

[0024] The following illustrations will reveal several embodiments of the present invention. For clarity, many physical details will be described in the following description. However, it should be understood that these physical details should not be used to limit the present invention. That is, in some embodiments of the present invention, these physical details are not essential. Furthermore, for the sake of simplicity, some conventional structures and components will be shown in a simple schematic manner in the illustrations.

[0025] Example:

[0026] For traditional twin-roll cold rolling mills, the drive mechanism 1 is installed at the top of the mill. Maintenance and repair require climbing or hoisting the rolls, which is cumbersome. The downward force acts in the opposite direction on the top crossbeam of the mill frame, causing the crossbeam to bear excessive bending moments over time. We propose a lower-drive cold rolling mill roll lifting device and cold rolling mill. Unlike traditional cold rolling mills, this cold rolling mill's roll lifting mechanism adopts a lower-drive lifting design. Compared to the traditional upper-drive lifting mechanism, the drive mechanism is installed at the bottom of the cold rolling mill. Through two sets of symmetrically designed worm gears and double screw drives, it directly pushes the upper roll bearing seat upwards. The force generated by the upper roll of the cold rolling mill is directly transmitted to the base of the cold rolling mill through the screws, beams, and roll frames, preventing the beams or crossbeams from bearing excessive bending moments. Furthermore, with the lower-drive lifting design, maintenance personnel do not need to climb or hoist the rolls during later maintenance, making operation simple, time-saving, and labor-saving. The specific solution is as follows:

[0027] Please see Figures 1-3 This embodiment provides a cold rolling mill roll lifting device, including two sets of symmetrically arranged drive mechanisms 1 and a beam frame 12 disposed at the top of the two sets of drive mechanisms 1; wherein, each set of drive mechanisms 1 includes a worm gear transmission box 101 and two power output worms 102 symmetrically arranged on both sides of the worm gear transmission box 101. In order to improve the stability of the power output worms 102, a first bearing 103 is installed at the other end of the two power output worms 102.

[0028] The worm gear transmission boxes 101 in the two sets of drive mechanisms 1 are connected by a transmission shaft 2. A drive motor 3 is installed on the worm gear transmission box 101 in one set of drive mechanisms 1. The drive motor 3 is a geared motor. One end of each of the two power output worms 102 in the same set of drive mechanisms 1 is integrally formed at the worm wheel shaft in the worm gear transmission box 101. The rotation of the worm wheel in the worm gear transmission box 101 synchronously drives the rotation of the power output worms 102 on both sides. To further explain, the two ends of the transmission shaft 2 are respectively installed on the worm ends in the two worm gear transmission boxes 101, and the output shaft of the drive motor 3 is connected to the other end of the worm in one of the worm gear transmission boxes 101. While the drive motor 3 drives the worm gear transmission box 101 in the set of drive mechanisms 1 to move, it also synchronously drives the worm gear transmission box 101 in the other set of drive mechanisms 1 to move synchronously through the transmission shaft 2.

[0029] Each drive mechanism 1 also includes two drive screws 105 that are respectively mounted upright on the sides of the two power output worm gears 102 via second seated bearings 104. At the bottom of each drive screw 105, there is a transmission worm wheel 106 that cooperates with the power output worm gear 102. The top ends of the two drive screws 105 in the same drive mechanism 1 are rotatably mounted on the beam frame 12 via positioning bearings 11. The rotation of the power output worm gear 102 drives the transmission worm wheel 106 to rotate, thereby causing the drive screw 105 to rotate. During the entire drive process, the power output by the drive motor 3 is initially decelerated by the worm gear transmission box 101, and then undergoes a second deceleration through the power output worm gear 102 and the transmission worm wheel 106 to obtain greater output torque. This ensures that the upper roll body can move smoothly up and down under the coordination of the two pairs of drive screws 105. In order to prevent the drive screws from generating axial displacement, the second seated bearing 104 and the positioning bearing 11 are both roller shaft thrust bearings.

[0030] In the same set of drive mechanisms 1, an upper roll bearing seat 5 and a lower roll bearing seat 4 for mounting the cold rolling roll body 7 are respectively installed between the two drive screws 105. A cold rolling roll body 7 is installed between the upper roll bearing seat 5 and the lower roll bearing seat 4 installed on the two sets of drive mechanisms 1.

[0031] To avoid affecting the lower roll when adjusting the upper roll of the cold rolling mill, the upper end of the drive screw 105 is the screw end 152, and the lower end is the sliding rod end 151. The two sides of the lower roll bearing seat 4 are slidably fitted onto the sliding rod end 151 of the drive screw 105, while the two sides of the upper roll bearing seat 5 are fitted onto the screw end 152 of the drive screw 105, forming a screw drive design. In addition, a positioning bushing 6 is slidably fitted in the middle of the drive screw 105 to separate the sliding rod end 151 and the screw end 152. The positioning bushing 6 is used to position the middle section of the drive screw 105, improving the stability of the drive screw 105. At the same time, it can also work with the roll frame 13 to position the lower roll bearing seat 4 in real time, preventing the lower roll bearing seat 4 from axially displacing on the drive screw 105.

[0032] The transmission worm gear 106 and the bottom end of the drive screw 105 are connected by a key. A locking nut 107 is threaded onto the drive screw 105 at the top of the transmission worm gear 106. The locking nut 107 is used to press the transmission worm gear 106 against the key connection at the bottom of the drive screw 105. This not only positions the transmission worm gear 106 but also facilitates future replacement and maintenance.

[0033] To improve the stability of the upper roll bearing housing 5 during lifting and lowering, it is vertically raised and lowered under the drive of the drive screw 105. A guide rod 8 is vertically fixed at the middle position of the top of the upper roll bearing housing 5, and the top of the guide rod 8 slides through the beam frame 12. At the same time, to improve the stability of the assembly between the upper roll bearing housing 5 and the two drive screws 105, a thread is provided on the surface of the guide rod 8 near the upper roll bearing housing 5 and an adjusting nut 10 is screwed on. A spring 9 is provided between the adjusting nut 10 and the beam frame 12 and is fitted on the outside of the guide rod 8. The spring 9 is a high-strength spring. The main function of the spring 9 is to apply force downward from above the cold rolling roll body 7 to offset part of the rolling force, thereby reducing the force between the drive screw 105 and the upper roll bearing housing 5, thus preventing wear of the screw threads on the drive screw 105. When adjusting the height of the upper roll in the cold rolling mill, the elastic stress of the spring 9 can be adjusted by loosening the adjusting nut 10.

[0034] In addition, the worm gear transmission box 101, power output worm 102, transmission worm wheel 106 and drive screw 105 in the two sets of drive mechanisms 1 are all made of high-precision and high-strength metal parts, and the drive screw 105 in the two sets of drive mechanisms 1 rotate synchronously and at the same speed during operation.

[0035] Please see Figures 4-5A cold rolling mill includes the aforementioned cold rolling mill roll lifting device, and further includes two roll frames 13 installed outside the two sets of drive mechanisms 1 in the cold rolling mill roll lifting device. The roll frames 13 are H-shaped. The sliding rod ends 151 of the two drive screws 105 in the drive mechanism 1 pass through the supporting beam column in the middle of the roll frame 13 and rotate with the supporting beam column via bearings. The bottom of the lower roll bearing seat 4 presses against the supporting beam column in the middle of the roll frame 13, and the top of the lower roll bearing seat 4 is positioned by a positioning bushing 6. The positioning bushing 6 in the cold rolling mill roll lifting device is fixed to the side wall of the roll frame 13. The drive screw 105 provides auxiliary support force, while the beam frame 12 in the cold rolling mill roll lifting device is fixedly installed on the top of the roll frame 13. It should be noted that in order to improve the stability of the entire roll frame 13, a crossbeam (not shown) can be installed between the two beam frames 12 to connect the tops of the two roll frames 13 together. A protective cover 14 is installed at the bottom between the two roll frames 13 to protect the drive shaft 2 in the cold rolling mill roll lifting device. For further dust prevention, dust covers (not shown) can also be installed on the sides of the two roll frames 13 to cover the power output worm gear 102 and the transmission worm wheel 106 in the drive mechanism 1.

[0036] The above description is merely an embodiment of this utility model and is not intended to limit the scope of this utility model. Various modifications and variations can be made to this utility model by those skilled in the art. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principle of this utility model should be included within the scope of the claims of this utility model.

Claims

1. A roll lifting device for a cold rolling mill, characterized in that: It includes two sets of symmetrically arranged drive mechanisms (1), and a beam frame (12) set at the top of the two sets of drive mechanisms (1); Both sets of drive mechanisms (1) include a worm gear transmission box (101) and two power output worms (102) symmetrically arranged on both sides of the worm gear transmission box (101). The drive mechanism (1) also includes two drive screws (105) that are respectively mounted upright on the sides of the two power output worm gears (102) via second bearing seats (104). The bottom end of each of the two drive screws (105) is provided with a transmission worm wheel (106) that cooperates with the power output worm gear (102). An upper roll bearing seat (5) and a lower roll bearing seat (4) are respectively installed between the two drive screws (105) in the same drive mechanism (1). The worm gear transmission boxes (101) in the two sets of drive mechanisms (1) are connected by a transmission shaft (2), and a drive motor (3) is installed on the worm gear transmission box (101) in one set of drive mechanisms (1).

2. The cold rolling mill roll lifting device according to claim 1, characterized in that: The upper end of the drive screw (105) is the screw end (152), and the lower end of the drive screw (105) is the slide rod end (151). The two sides of the lower roll bearing seat (4) are slidably fitted on the slide rod end (151) of the drive screw (105), and the two sides of the upper roll bearing seat (5) are fitted on the screw end (152) of the drive screw (105) and together with the screw end (152) form a screw transmission mechanism. A positioning bushing (6) is slidably fitted in the middle of the drive screw (105) to separate the slide rod end (151) and the screw end (152).

3. The cold rolling mill roll lifting device according to claim 1, characterized in that: The top ends of the two drive screws (105) in the same group of drive mechanisms (1) are rotatably mounted on the beam frame (12) through the positioning bearing (11). The transmission worm gear (106) and the bottom end of the drive screw (105) are connected by a key. A locking nut (107) is threaded on the drive screw (105) at the top of the transmission worm gear (106). The second seated bearing (104) and the positioning bearing (11) are both roller thrust bearings.

4. The cold rolling mill roll lifting device according to claim 1, characterized in that: One end of each of the two power output worms (102) in the same group of drive mechanisms (1) is integrally formed at the worm wheel shaft in the worm gear transmission box (101), and the other end of the two power output worms (102) is equipped with a first seated bearing (103).

5. The cold rolling mill roll lifting device according to claim 1, characterized in that: The two ends of the drive shaft (2) are respectively installed on the worm ends in two worm gear transmission boxes (101), and the output shaft of the drive motor (3) is connected to the other end of the worm in one of the worm gear transmission boxes (101).

6. The cold rolling mill roll lifting device according to claim 1, characterized in that: A guide rod (8) is vertically fixed at the middle position of the top of the upper roll bearing seat (5). The top of the guide rod (8) slides through the beam frame (12). The surface of the guide rod (8) near the upper roll bearing seat (5) is threaded and screwed with an adjusting nut (10). A spring (9) is provided between the adjusting nut (10) and the beam frame (12) and is fitted on the outside of the guide rod (8). The spring (9) is a strong spring (9).

7. A cold rolling mill roll lifting device according to claim 1, characterized in that: A cold rolling roll body (7) is installed between the upper roll bearing seat (5) and the lower roll bearing seat (4) on the two sets of drive mechanisms (1).

8. A cold rolling mill, characterized in that: Includes the cold rolling mill roll lifting device as described in any one of claims 1-7.

9. A cold rolling mill according to claim 8, characterized in that: It also includes two roll frames (13) installed outside the two sets of drive mechanisms (1) in the cold rolling mill roll lifting device. The positioning bushing (6) in the cold rolling mill roll lifting device is fixed to the side wall of the roll frame (13), while the beam frame (12) in the cold rolling mill roll lifting device is fixedly installed at the top of the roll frame (13). A protective cover (14) for protecting the drive shaft (2) in the cold rolling mill roll lifting device is installed at the bottom position between the two roll frames (13).

Images