A grinding and polishing device for hot rolling work rolls

Abstract

This utility model discloses a hot-rolled work roll grinding and polishing device, relating to the field of work roll grinding and polishing technology. It includes a rotating seat and a protective frame. The rotating seat drives a rotating shaft to rotate an active grinding gear. The outer wall of the active grinding gear meshes with a driven grinding gear to achieve synchronous rotation. Two grinding limit rings are used to simultaneously grind two work rolls. A positioning rod fixes the limit frame to the bottom of the protective frame, providing support for the limit gear ring. The limit gear ring provides support for the rotational movement of the driven grinding gear. An adjusting slider can move within an adjusting groove, utilizing two limit plates for its limiting effect. The first and second telescopic rods compress springs when the first and second arc-shaped grinding pads contact the outer wall of the work roll, achieving simultaneous grinding of the work rolls and heating and grinding using heating elements. The limit slider slides at both ends of the inner side, achieving the limiting effect of the second arc-shaped grinding pad.

Description

Technical Field

[0001] This utility model relates to the field of hot rolling mill work roll grinding and polishing technology, and in particular to a hot rolling mill work roll grinding and polishing device. Background Technology

[0002] Hot rolling is an indispensable and crucial process in the production of sheet and strip steel, non-ferrous metals, and other products. The hot rolling work roll is the core component of the hot rolling mill, operating continuously under harsh conditions of high temperature, high pressure, and high load, directly contacting the hot metal billet. After prolonged operation, the surface of the work roll will suffer damage due to various factors.

[0003] A patent with publication number CN117103115A discloses a grinding head device for a hot-rolled work roll polishing machine. This patent includes a grinding head, an elastic pad, a main shaft, a movable sleeve, bearings, a rotary hydraulic motor, a motor support and flange, a gear coupling, a feed hydraulic cylinder, a fixed housing, a pressure wheel assembly, a pressure roller, a pin, an end cover, and a sliding plate. The grinding head device of the hot-rolled work roll polishing machine is mounted on the fixed housing via the feed hydraulic cylinder, and the fixed housing maintains the stability of the feed hydraulic cylinder. The feed hydraulic cylinder is used for cleaning the roll surface of the work roll. The grinding head assembly body is driven and connected to drive the grinding head assembly body to move linearly toward or away from the roll surface of the work roll. The feed hydraulic cylinder realizes the feed movement of the grinding head assembly body. Two grinding head assembly bodies are set at both ends of the fixed housing along the axial direction of the work roll, thereby increasing the number of grinding head assembly bodies. In this way, when correcting the roll surface of the work roll, the feed hydraulic cylinder feeds the two grinding head assembly bodies simultaneously, thereby improving the polishing and grinding efficiency of the hot rolling work roll polishing machine. However, the following problems still exist in this patent: The synchronous control precision requirements of multiple independent hydraulic systems are extremely high. Under actual working conditions, it is difficult to ensure that the pressure and rotation speed applied to the roller surface by the two grinding heads are completely consistent, which may lead to uneven repair at both ends of the work roller. Secondly, the hydraulic system has risks such as leakage and response lag, which affect the stability and reliability of long-term operation. During the grinding process, especially when dealing with high-hardness roller surfaces or performing heavy-duty grinding, the grinding head will be subjected to a large reaction force, which is prone to vibration and wobbling, affecting the final surface finish and roundness accuracy. The clamping wheel set mentioned in the patent is mainly used for auxiliary positioning, but its support for the dynamic stability of the grinding head body during rotation and feeding is limited. Simple cold mechanical grinding is not only inefficient and causes rapid tool wear, but it is also difficult to effectively eliminate these deep defects, and the service life of the repaired roller surface is only slightly improved.

[0004] To address the above problems, it is necessary to design a hot rolling mill work roll grinding and polishing device to overcome these issues. Utility Model Content

[0005] The main purpose of this utility model is to provide a hot rolling mill work roll grinding and polishing device, which can effectively solve the problems in the background art.

[0006] To achieve the above objectives, the technical solution adopted by this utility model is as follows: A hot-rolled work roll grinding and polishing device includes a rotating seat and a protective frame. A partition is installed in the middle of the interior of the protective frame. An adjustment groove is formed on one side of the partition. An adjustment slider is connected to the inner side of the adjustment groove. Limit plates are connected to both ends of the adjustment slider. A first telescopic rod is connected to the end of each of the two limit plates away from the adjustment slider. A spring is connected to the outer wall of each of the two first telescopic rods. A positioning block is connected to the end of each of the two first telescopic rods away from the limit plates. A first arc-shaped grinding pad is connected to the end of each of the two positioning blocks away from the first telescopic rods. Limit sliders are slidably connected to both ends of the inner side of the protective frame. A second telescopic rod is connected to the side of the limit slider away from the protective frame. A second arc-shaped grinding pad is connected to the end of the second telescopic rod away from the limit slider. Heating elements are connected to the inner sides of both the first and second arc-shaped grinding pads.

[0007] As a preferred embodiment of this utility model, the output end of the rotating seat is connected to a rotating shaft, the output end of the rotating shaft is connected to an active grinding gear, the outer wall of the active grinding gear is connected to a driven grinding gear, the top of both the active grinding gear and the driven grinding gear is connected to a grinding limiting ring, the outer wall of the driven grinding gear is connected to a limiting gear ring, the outer wall of the limiting gear ring is connected to a limiting frame, and the four corners of the top of the limiting frame are connected to positioning rods.

[0008] In a preferred embodiment of this utility model, the adjusting slider is slidably connected to the inner side of the adjusting groove, the adjusting slider is fixedly connected to the two limiting plates, and the limiting plates are rotatably connected to the two first telescopic rods.

[0009] As a preferred embodiment of this utility model, the first telescopic rod is fixedly connected to the spring, the end of the first telescopic rod away from the limiting plate is rotatably connected to the positioning block, and the positioning block is fixedly connected to the first arc-shaped grinding pad.

[0010] As a preferred embodiment of this utility model, the limiting slider is slidably connected to both ends of the inner side of the protective frame, the limiting slider is rotatably connected to the second telescopic rod, the second telescopic rod is rotatably connected to the second arc-shaped grinding pad, and both the first arc-shaped grinding pad and the second arc-shaped grinding pad are fixedly connected to the heating element.

[0011] In a preferred embodiment of this utility model, the rotating seat is connected to the active grinding gear via the rotating shaft, the active grinding gear is meshed with the driven grinding gear, and both the active grinding gear and the driven grinding gear are fixedly connected to the grinding limiting ring.

[0012] In a preferred embodiment of this utility model, the outer wall of the driven grinding gear meshes with the inner side of the limiting gear ring, the limiting gear ring is fixedly connected to the limiting frame, and the limiting frame is fixedly connected to the bottom of the protective frame through the positioning rod.

[0013] Beneficial effects Compared with the prior art, the present invention has the following beneficial effects: This hot-rolled work roll grinding and polishing device uses a rotating seat to drive a rotating shaft, which in turn drives an active grinding gear to rotate. The outer wall of the active grinding gear meshes with the driven grinding gear to achieve synchronous rotation. Two grinding limit rings are used to grind two work rolls simultaneously. A positioning rod fixes a limit frame to the bottom of a protective frame, providing support for the limit gear ring. The limit gear ring also provides support for the rotation of the driven grinding gear. An adjusting slider can move within an adjusting groove, using two limit plates for its limiting effect. The first and second telescopic rods compress springs when the first and second arc-shaped grinding pads contact the outer wall of the work rolls, allowing for simultaneous grinding of the work rolls and heating grinding using heating elements. The limit slider slides at both ends of the inner side, limiting the second arc-shaped grinding pad. Attached Figure Description

[0014] Figure 1 This is a schematic diagram of the overall structure of this utility model; Figure 2 This is a schematic diagram of the limiting gear ring installation structure of this utility model; Figure 3 This is a schematic diagram of structure A of this utility model; Figure 4 This is a schematic diagram of the installation structure of the first arc-shaped grinding pad and the second arc-shaped grinding pad of this utility model.

[0015] In the diagram: 1. Rotary seat; 2. Protective frame; 3. Rotary shaft; 4. Active grinding gear; 5. Driven grinding gear; 6. Grinding limit ring; 7. Positioning rod; 8. Limiting frame; 9. Limiting gear ring; 10. Partition plate; 11. Adjusting groove; 12. Adjusting slider; 13. Limiting plate; 14. First telescopic rod; 15. Spring; 16. Positioning block; 17. First arc-shaped grinding pad; 18. Second arc-shaped grinding pad; 19. Heating element; 20. Second telescopic rod; 21. Limiting slider. Detailed Implementation

[0016] To make the technical means, creative features, objectives and effects of this utility model easier to understand, the present utility model will be further described below in conjunction with specific embodiments.

[0017] like Figures 1-4 As shown, a hot rolling mill work roll grinding and polishing device includes a rotating seat 1 and a protective frame 2. A partition 10 is installed in the middle of the interior of the protective frame 2. An adjustment groove 11 is opened on one side of the partition 10. An adjustment slider 12 is connected to the inner side of the adjustment groove 11. Limiting plates 13 are connected to both ends of the adjustment slider 12. A first telescopic rod 14 is connected to the end of each of the two limiting plates 13 away from the adjustment slider 12. A spring 15 is connected to the outer wall of each of the two first telescopic rods 14. A positioning block 16 is connected to the end of each of the two first telescopic rods 14 away from the limiting plate 13. A first arc-shaped grinding pad 17 is connected to the end of each of the two positioning blocks 16 away from the first telescopic rod 14. Limiting sliders 21 are slidably connected to both ends of the inner side of the protective frame 2. A second telescopic rod 20 is connected to the side of the limiting slider 21 away from the protective frame 2. A second arc-shaped grinding pad 18 is connected to the end of the second telescopic rod 20 away from the limiting slider 21. Heating elements 19 are connected to the inner sides of the first arc-shaped grinding pad 17 and the second arc-shaped grinding pad 18. The adjusting slider 12 is slidably connected to the inner side of the adjusting groove 11. The adjusting slider 12 is fixedly connected to the two limiting plates 13. The limiting plates 13 are rotatably connected to the two first telescopic rods 14. The first telescopic rods 14 are fixedly connected to the springs 15. The end of the first telescopic rods 14 away from the limiting plates 13 is rotatably connected to the positioning block 16. The positioning block 16 is fixedly connected to the first arc-shaped grinding pad 17. The limiting slider 21 is slidably connected to both ends of the inner side of the protective frame 2. The limiting slider 21 is rotatably connected to the second telescopic rod 20. The second telescopic rod 20 is rotatably connected to the second arc-shaped grinding pad 18. The first arc-shaped grinding pad 17 and the second arc-shaped grinding pad 18 are both fixedly connected to the heating element 19. Specifically, in this embodiment, the first arc-shaped grinding pad 17 is installed in the adjustment groove 11 via the adjusting slider 12. The operator, according to the diameter of the work roller, loosens the locking mechanism of the adjusting slider 12 and manually or via a fine-tuning mechanism pushes the adjusting slider 12 along the track of the adjustment groove 11, causing it to move the first arc-shaped grinding pad 17 closer to the surface of the work roller. After adjustment, the adjusting slider 12 is locked and further tightened by the limiting plate 13 to ensure that it will not shift due to vibration during grinding. The second arc-shaped grinding pad 18 is installed via the second telescopic rod 20 and the limiting slider 21. This part is designed as an adaptive structure, requiring no precise pre-adjustment. Before startup, it is ensured that the limiting slider 21 can slide freely within its track, and the spring 15 inside the second telescopic rod 20 is in a naturally extended state. At this time, a safe distance is maintained between the second arc-shaped grinding pad 18 and the surface of the work roller. The first arc-shaped grinding pad 17 first contacts the surface of the work roll. As the feed continues, the force is transmitted to the spring 15 through the first telescopic rod 14. The spring 15 is compressed, generating a continuous and stable reverse force, causing the first arc-shaped grinding pad 17 to press against the surface of the work roll with constant pressure, initiating mechanical grinding. Immediately afterwards, the second arc-shaped grinding pad 18 also contacts the surface of the work roll. Similarly, its force compresses the spring 15 within the second telescopic rod 20, achieving adaptive pressure application. The limiting slider 21 acts as a guide and prevents torsion during this process, ensuring that the pressure acts perpendicularly on the roll surface. While the first and second arc-shaped grinding pads 17 and 18 are in stable contact with the surface of the work roll and applying pressure, the heating element 19 integrated inside the grinding pad, such as a resistance heating element or an electromagnetic induction coil, is activated. The heating element 19 rapidly heats up and conducts heat through the grinding pad to the surface of the work roll, providing real-time heating to the area being mechanically ground. The heat softens the high-hardness material of the roll surface, reducing grinding resistance, improving material removal efficiency, and simultaneously improving the surface stress state.

[0018] The output end of the rotating seat 1 is connected to the rotating shaft 3, the output end of the rotating shaft 3 is connected to the active grinding gear 4, the outer wall of the active grinding gear 4 is connected to the driven grinding gear 5, the top of the active grinding gear 4 and the driven grinding gear 5 are both connected to the grinding limit ring 6, the outer wall of the driven grinding gear 5 is connected to the limit gear ring 9, the outer wall of the limit gear ring 9 is connected to the limit frame 8, and the four corners of the top of the limit frame 8 are all connected to the positioning rod 7. The rotating seat 1 is connected to the active grinding gear 4 via the rotating shaft 3. The active grinding gear 4 is meshed with the driven grinding gear 5. Both the active grinding gear 4 and the driven grinding gear 5 are fixedly connected to the grinding limiting ring 6. The outer wall of the driven grinding gear 5 is meshed with the inner side of the limiting gear ring 9. The limiting gear ring 9 is fixedly connected to the limiting frame 8. The limiting frame 8 is fixedly connected to the bottom of the protective frame 2 via the positioning rod 7. Specifically, in this embodiment, the working roller is slowly and smoothly fed into the inner rings of the two grinding limit rings 6. During this process, it is ensured that the axis of the working roller coincides as much as possible with the central axis of the grinding limit rings 6. The working roller relies on its own weight or auxiliary support to make its outer circle fit against the inner wall of the two grinding limit rings 6. At this time, the grinding limit rings 6 play a preliminary radial positioning and support role, preventing the working roller from shaking or shifting during subsequent startup. The starting rotary seat 1 is usually a servo motor or a geared motor. The motor drives the rotating shaft 3 to start rotating through its output shaft. Shaft 3 transmits power to the driving grinding gear 4, which is fixedly connected to it, causing it to rotate synchronously. The rotation of the driving grinding gear 4, through the meshing of its external teeth with the driven grinding gear 5, transmits power to the driven grinding gear 5, driving it to rotate in opposite directions at the same linear velocity. Since both the driving grinding gear 4 and the driven grinding gear 5 are fixedly connected to the grinding limiting rings 6, the two grinding limiting rings 6 also begin to rotate synchronously. The work roller, enclosed within the grinding limiting rings 6, is driven by friction to rotate stably and uniformly along with the grinding limiting rings 6. At this point, the work roller obtains the rotational motion required for grinding. While the driven grinding gear 5 rotates, its outer wall remains meshed with the inner surface of the limiting gear ring 9. The limiting gear ring 9, as a fixed, large-diameter internal gear ring, provides strong radial support and circumferential limitation for the driven grinding gear 5.

[0019] It should be noted that this utility model is a hot-rolled work roll grinding and polishing device. In use, the output shaft of the rotating seat 1 is directly connected to the rotating shaft 3, transmitting power to the rotating shaft 3. The end of the rotating shaft 3 is fixedly mounted with an active grinding gear 4, so the active grinding gear 4 starts to rotate at high speed. The outer wall of the active grinding gear 4 meshes tightly with the teeth of the driven grinding gear 5. According to the basic principle of gear transmission, the rotation of the active grinding gear 4 will drive the driven grinding gear 5 to rotate synchronously in the opposite direction with a fixed transmission ratio. The tops of the active grinding gear 4 and the driven grinding gear 5 are fixedly connected to the grinding limiting ring 6. This means that when the two gears rotate synchronously, they will drive the grinding limiting ring 6 fixed to them to rotate together. Since the work roll is placed inside the grinding limiting ring 6, there is a certain friction between the two or they will make close contact through the subsequent pressure mechanism first arc-shaped grinding pad 17 and second arc-shaped grinding pad 18. Therefore, the rotating grinding limiting ring 6 will drive the work roll itself to start rotating as well. While the driven grinding gear 5 rotates, its outer wall remains engaged with the inner side of a large, stationary limiting gear ring 9. This limiting gear ring 9 itself does not rotate; it acts like an "external gear ring," providing multi-point, continuous radial support for the rotating driven grinding gear 5. This "internal gear-external gear ring" structure greatly enhances the stability of the driven grinding gear 5 during rotation, effectively suppressing its radial runout and vibration. The stability of the limiting gear ring 9 is not merely theoretical; it is firmly welded or bolted to the limiting frame 8. The limiting frame 8, through four positioning rods 7, acts like four sturdy "pillars," transferring and fixing all its own weight and forces, along with those of the limiting gear ring 9, to the bottom protective frame 2 of the device. The protective frame 2 is the base of the entire device, possessing extremely high rigidity and weight. The first arc-shaped grinding pad 17 and the second arc-shaped grinding pad 18 are components that directly contact the surface of the work roller and perform the grinding task. They are respectively mounted on the adjusting slider 12 and the limiting slider 21 via the first telescopic rod 14 and the second telescopic rod 20. When grinding is required to start, an external mechanism such as a hydraulic cylinder or a lead screw drives the adjusting slider 12 to move towards the work roller in the adjusting groove 11. When the arc-shaped grinding pad contacts the outer wall of the work roller, the force of continued advancement compresses the spring 15 connected to the telescopic rod. The spring 15 is the core adaptive element, which can automatically extend and retract according to the actual contour of the work roller surface, such as existing depressions, protrusions, or non-roundness, thereby adjusting and maintaining a relatively constant contact pressure in real time. This ensures that even if the roller surface is uneven, uniform material removal can be achieved. Inside the first arc-shaped grinding pad 17 and the second arc-shaped grinding pad 18, a heating element 19 is integrated. During the grinding process, the heating element 19 is energized to locally heat the surface of the work roller. Compared to the passive following mode of "pressure roller set + grinding head" used in the prior art and common existing technologies, where the grinding head is pressed against the surface of the work roll by the pressure roller, and its rotational power comes from the friction with the surface of the work roll, the friction will change when there is oil, uneven wear or hardness difference on the surface of the work roll. This can easily lead to the grinding head slipping or uneven speed, resulting in uneven grinding and new surface defects, which seriously affect the roundness and cylindricity of the repaired surface. This utility model provides power by an internal precision gear system, which is independent of the surface condition of the work roll, and completely eliminates the slippage phenomenon. Regardless of the initial conditions of the roll surface, it can ensure a constant and uniform speed and grinding force, ensuring a high degree of consistency and repeatability of the grinding process. Since the grinding limit ring 6 rotates actively, it provides a precise and ideal geometric reference for the work roll. With the cooperation of the adaptive pressure of the spring 15, the device can actively "shave peaks and fill valleys", effectively correcting macroscopic geometric defects such as roundness and cylindricity errors of the work roll, realizing a functional upgrade from "polishing" to "precision shaping". Stable synchronous rotation avoids ineffective slippage and idling, ensuring efficient material removal with each grinding operation. This significantly improves repair efficiency while guaranteeing higher final geometric accuracy. In contrast, the patent relies on pressure rollers and elastic pads to provide contact force. The entire support and feed system, with the grinding head driven by the hydraulic cylinder, is prone to slight elastic deformation or vibration under stress, especially when encountering hard points on the work roller surface. While this flexible connection provides some cushioning, it sacrifices system rigidity, leading to decreased positioning accuracy over time. Furthermore, the hydraulic system itself suffers from leakage and complex maintenance issues. This invention addresses these problems by incorporating a "limiting gear ring 9 - limiting frame 8". The four-stage support chain of "positioning rod 7 - protective frame 2" and the meshing of the limiting gear ring 9 with the driven grinding gear 5 not only transmit power, but more importantly, provide radial and axial rigid constraints for the high-speed rotating gear, effectively suppressing the vibration and sway of the gear under heavy load, ensuring the smoothness and accuracy of transmission. The positioning rod 7 firmly fixes the entire support system to the bottom of the protective frame 2, forming a stable overall structure. The heating element 19 heats the roller surface in real time and locally during operation, effectively softening the high-hardness roller surface material, significantly reducing the yield strength and grinding resistance of the material. This makes the material removal rate increase exponentially under the same pressure, greatly shortening the repair time.

[0020] The foregoing has shown and described the basic principles, main features, and advantages of this utility model. Those skilled in the art should understand that this utility model is not limited to the above embodiments. The embodiments and descriptions in the specification are merely illustrative of the principles of this utility model. Various changes and modifications can be made to this utility model without departing from its spirit and scope, and all such changes and modifications fall within the scope of the claims. The scope of protection of this utility model is defined by the appended claims and their equivalents.

Claims

1. A grinding and polishing device for hot-rolled work rolls, comprising a rotating seat (1) and a protective frame (2), characterized in that: A partition (10) is installed in the middle of the interior of the protective frame (2). An adjustment groove (11) is provided on one side of the partition (10). An adjustment slider (12) is connected to the inner side of the adjustment groove (11). Limiting plates (13) are connected to both ends of the adjustment slider (12). A first telescopic rod (14) is connected to the end of each of the two limiting plates (13) away from the adjustment slider (12). A spring (15) is connected to the outer wall of each of the two first telescopic rods (14). A positioning block is connected to the end of each of the two first telescopic rods (14) away from the limiting plate (13). (16) The two positioning blocks (16) are connected to a first arc-shaped grinding pad (17) at one end away from the first telescopic rod (14). Both ends of the inner side of the protective frame (2) are slidably connected to a limit slider (21). The side of the limit slider (21) away from the protective frame (2) is connected to a second telescopic rod (20). The end of the second telescopic rod (20) away from the limit slider (21) is connected to a second arc-shaped grinding pad (18). The inner sides of the first arc-shaped grinding pad (17) and the second arc-shaped grinding pad (18) are both connected to a heating element (19).

2. The hot-rolled work roll grinding and polishing device according to claim 1, characterized in that: The output end of the rotating seat (1) is connected to a rotating shaft (3), the output end of the rotating shaft (3) is connected to an active grinding gear (4), the outer wall of the active grinding gear (4) is connected to a driven grinding gear (5), the top of the active grinding gear (4) and the driven grinding gear (5) are both connected to a grinding limiting ring (6), the outer wall of the driven grinding gear (5) is connected to a limiting gear ring (9), the outer wall of the limiting gear ring (9) is connected to a limiting frame (8), and the four corners of the top of the limiting frame (8) are all connected to positioning rods (7).

3. The hot-rolled work roll grinding and polishing device according to claim 1, characterized in that: The adjusting slider (12) is slidably connected to the inner side of the adjusting groove (11), the adjusting slider (12) is fixedly connected to the two limiting plates (13), and the limiting plates (13) are rotatably connected to the two first telescopic rods (14).

4. The hot-rolled work roll grinding and polishing device according to claim 1, characterized in that: The first telescopic rod (14) is fixedly connected to the spring (15), and the end of the first telescopic rod (14) away from the limiting plate (13) is rotatably connected to the positioning block (16). The positioning block (16) is fixedly connected to the first arc-shaped grinding pad (17).

5. The hot-rolled work roll grinding and polishing device according to claim 1, characterized in that: The limiting slider (21) is slidably connected to both ends of the inner side of the protective frame (2), the limiting slider (21) is rotatably connected to the second telescopic rod (20), the second telescopic rod (20) is rotatably connected to the second arc-shaped grinding pad (18), and the first arc-shaped grinding pad (17) and the second arc-shaped grinding pad (18) are both fixedly connected to the heating element (19).

6. The hot-rolled work roll grinding and polishing device according to claim 2, characterized in that: The rotating seat (1) is connected to the active grinding gear (4) via the rotating shaft (3). The active grinding gear (4) is meshed with the driven grinding gear (5). Both the active grinding gear (4) and the driven grinding gear (5) are fixedly connected to the grinding limiting ring (6).

7. The hot-rolled work roll grinding and polishing device according to claim 2, characterized in that: The outer wall of the driven grinding gear (5) meshes with the inner side of the limiting gear ring (9), the limiting gear ring (9) is fixedly connected to the limiting frame (8), and the limiting frame (8) is fixedly connected to the bottom of the protective frame (2) through the positioning rod (7).

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