A mechanism for protecting a finishing mill from broken rolls

Abstract

The utility model discloses a kind of finishing mill broken roll protection mechanism, including base, one pressure sensor is fixed on each base, the upper side of each pressure sensor is fixed with a stand, the upper side of each stand is provided with a support plate, the bottom of support plate is fixed with multiple guide rods that pass through stand, guide rod and stand are slidably connected, the lower half of each guide rod is provided with a high stiffness spring outside, the lower end of high stiffness spring is fixed with guide rod, and the upper end is fixed with stand, gap is arranged between the top of support plate and stand, multiple limit washers are detachably installed in gap, sound-light alarm is fixedly installed on one side of stand.The utility model rolls over when changing, the maximum moving distance of support plate can be controlled by adjusting limit washer quantity, form hard limit to prevent excessive downward pressure damage of upper roll;And it has overpressure alarm function, guaranteeing that it is accurate and rolling quality to press against calibration, also avoid equipment damage, improve security.

Description

Technical Field

[0001] This utility model relates to the field of finishing mill roll changing technology, and in particular to a finishing mill roll breakage protection mechanism. Background Technology

[0002] Roll changing (work rolls / support rolls) is a core part of regular production line maintenance, aiming to replace worn / failed rolls and restore rolling accuracy. The process involves five steps: old roll removal, new roll installation, roll system alignment, pressure fitting, and accuracy verification. Pressure fitting is the critical calibration step. In finishing mill roll changing operations, manual operation is prone to multiple risks that can lead to accidental pressure fitting, causing significant losses to the company. On the one hand, operators are prone to human error when they are less alert at night, which may trigger unexpected pressing actions. On the other hand, the traditional roll changing process lacks an effective real-time monitoring and emergency intervention mechanism, making it difficult to detect erroneous pressing in time. This can cause irreversible damage to the rolls, ranging from minor damage to roll rings requiring diameter reduction and remapping for repair, significantly shortening roll life and delaying production, to severe damage directly breaking the rolls, resulting in high equipment replacement costs and production downtime losses. Therefore, in response to the above situation, there is an urgent need to develop a roll breakage protection mechanism for finishing mills that can control the maximum downward movement distance of the support plate by adjusting the number of limit shims during roll changing and pressing, forming a hard limit to prevent excessive pressing damage to the upper roll; and has an overpressure alarm function. This mechanism can ensure the accuracy of pressing calibration and rolling quality, while avoiding equipment damage and improving safety, thus overcoming the shortcomings in current practical applications and meeting current needs. Utility Model Content

[0003] The purpose of this utility model is to provide a roll breakage protection mechanism for a finishing mill to solve the problems mentioned in the background art.

[0004] To achieve the above objectives, the present invention adopts the following technical solution:

[0005] A broken roll protection mechanism for a finishing mill includes a base, a pressure sensor, a column, a support plate, limit gaskets, an audible and visual alarm, and a PLC controller. There are two bases, two pressure sensors, two columns, and two support plates. Each base has a fixed pressure sensor, and each pressure sensor has a fixed column on its upper side. Each column has a support plate on its upper side. Multiple guide rods penetrating the column are fixed to the bottom of the support plate and are slidably connected to the column. A high-stiffness spring is installed on the outer side of the lower half of each guide rod, with the lower end of the spring fixed to the guide rod and the upper end fixed to the column. A gap is provided between the support plate and the top of the column, and multiple limit gaskets are detachably installed within this gap. An audible and visual alarm is fixedly installed on one side of each column.

[0006] Preferably, the pressure sensor and the audible and visual alarm are electrically connected to the PLC controller.

[0007] Preferably, the limiting pad is provided with a U-shaped groove for the guide rod to pass through.

[0008] Preferably, the thickness of a single limiting pad is 1 mm.

[0009] The beneficial effects of this utility model are as follows: When replacing a new roll in a finishing mill, the upper roll needs to be pressed downwards using a hydraulic system to calibrate the gap between the upper and lower rolls and ensure rolling accuracy. When pressing the upper roll, the number of limiting shims is first adjusted according to the required downward pressing distance of the upper roll, thereby controlling the maximum downward movement distance of the support plate. This maximum downward movement distance should be the same as the required downward pressing distance of the upper roll. Then, the hydraulic system in the mill is activated to press down the support seat of the upper roll. The upper roller moves downward, pressing down on the support plate. A pressure sensor detects the pressure value and transmits it to the PLC controller. As the support plate moves downward, it causes a high-stiffness spring to deform, providing a buffer. When the support plate presses against the limit shims, a hard limit is formed, preventing further downward movement and thus preventing damage to the upper roller from excessive pressure. Additionally, when the pressure detected by the pressure sensor reaches the pressure alarm value, the PLC controller activates an audible and visual alarm to alert the operator of any abnormality and promptly stop the hydraulic pressing system, thereby improving safety. In summary, this invention allows for control of the maximum downward movement distance of the support plate during roller changing and pressing by adjusting the number of limit shims, forming a hard limit to prevent damage from excessive pressure on the upper roller; it also features an overpressure alarm function, ensuring both pressing calibration accuracy and rolling quality while preventing equipment damage and improving safety. Attached Figure Description

[0010] Figure 1 This is a three-dimensional structural diagram of the present invention.

[0011] Figure 2 This is a schematic diagram of the usage state of this utility model.

[0012] Figure 3 This is a partial structural diagram of the present invention. Figure 1 .

[0013] Figure 4 This is a partial structural diagram of the present invention. Figure 2 .

[0014] Legend:

[0015] 1. Base; 2. Pressure sensor; 3. Column; 4. Support plate; 401. Guide rod; 402. High-rigidity spring; 5. Limiting gasket; 501. U-shaped groove; 6. Audible and visual alarm; 7. PLC controller. Detailed Implementation

[0016] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those skilled in the art without creative effort are within the protection scope of the present utility model.

[0017] Specific implementation examples are given below.

[0018] See Figures 1-4 In this embodiment of the utility model, a broken roll protection mechanism for a finishing mill includes a base 1, a pressure sensor 2, a column 3, a support plate 4, a limiting gasket 5, an audible and visual alarm 6, and a PLC controller 7. There are two bases 1, two pressure sensors 2, two columns 3, and two support plates 4. The base 1 is fixed to the ground and installed at the roll of the finishing mill. The two support plates 4 are located on the lower sides of both ends of the roll on the finishing mill. A pressure sensor 2 is fixed on each base 1, and a column 3 is fixed above each pressure sensor 2. A support plate 4 is provided on the upper side of each column 3. Multiple guide rods 401 penetrating the column 3 are fixed to the bottom of the support plate 4. The guide rods 401 are connected to... The column 3 is slidably connected. A high-stiffness spring 402 is provided on the outer side of the lower half of each guide rod 401. The lower end of the high-stiffness spring 402 is fixed to the guide rod 401 and the upper end is fixed to the column 3. A gap is provided between the support plate 4 and the top of the column 3. This gap is reserved for pressing down against the upper roller when changing the roller. Multiple limiting shims 5 are detachably installed in the gap. The thickness of a single limiting shim 5 is 1mm. When the support plate 4 presses against the limiting shim 5, it forms a hard limit and cannot move further down. The maximum downward movement distance of the support plate 4 can be adjusted by adjusting the number of limiting shims 5. In use, the maximum downward movement distance of the support plate 4 can be adjusted to be consistent with the distance that the upper roller needs to press down against.

[0019] A sound and light alarm 6 is fixedly installed on one side of the column 3. The PLC controller 7 is installed in the control center of the rolling mill (the location shown in the figure is for illustrative purposes only, and the actual installation location can be adjusted according to requirements). The pressure sensor 2 and the sound and light alarm 6 are electrically connected to the PLC controller 7. The PLC controller 7 has a pressure alarm value pre-input. When the pressure detected by the pressure sensor 2 reaches the pressure alarm value, the PLC controller 7 controls the sound and light alarm 6 to sound an alarm.

[0020] The limiting gasket 5 is provided with a U-shaped groove 501 for the guide rod 401 to pass through, so as to install and remove the limiting gasket 5.

[0021] Working Principle: This finishing mill roll breakage protection mechanism works by using a hydraulic system to press the upper roll downwards after replacing a new roll. This calibrates the gap between the upper and lower rolls, ensuring rolling accuracy. When pressing the upper roll, the number of limit shims 5 is adjusted according to the required downward pressing distance. This controls the maximum downward movement distance of the support plate 4, ensuring it matches the required downward pressing distance of the upper roll. Then, the hydraulic system within the mill is activated to press down the support seat of the upper roll. The support seat then moves the upper roll downwards, thus lowering the upper roll. The roller presses down on the support plate 4. The pressure sensor 2 detects the pressure value and sends it to the PLC controller 7. When the support plate 4 moves down, it causes the high-stiffness spring 402 to deform and provide a certain buffer. When the support plate 4 presses on the limit pad 5, it forms a hard limit and cannot move down further, thus preventing the upper roller from being damaged by excessive pressure. In addition, when the pressure detected by the pressure sensor 2 reaches the pressure alarm value, the PLC controller 7 controls the audible and visual alarm 6 to sound an alarm to remind the operator that an abnormality has occurred and to stop the hydraulic pressing system in time, thereby improving safety.

[0022] Furthermore, it should be noted that, in the description of this utility model, 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 connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model according to the specific circumstances.

[0023] The above description is only a preferred embodiment of the present utility model, but the protection scope of the present utility model is not limited thereto. Any equivalent substitutions or changes made by those skilled in the art within the technical scope disclosed in the present utility model, based on the technical solution and the inventive concept of the present utility model, should be included within the protection scope of the present utility model.

Claims

1. A broken roll protection mechanism for a finishing mill, characterized in that, The system includes a base (1), a pressure sensor (2), a column (3), a support plate (4), a limiting pad (5), an audible and visual alarm (6), and a PLC controller (7). Each base (1), pressure sensor (2), column (3), and support plate (4) consists of two units. Each base (1) has a fixed pressure sensor (2), and each pressure sensor (2) has a fixed column (3) on its upper side. Each column (3) has a support plate (4) on its upper side. The bottom of the support plate (4)... Multiple guide rods (401) are fixedly connected to the column (3). The guide rods (401) are slidably connected to the column (3). A high-stiffness spring (402) is provided on the outer side of the lower half of each guide rod (401). The lower end of the high-stiffness spring (402) is fixed to the guide rod (401) and the upper end is fixed to the column (3). A gap is provided between the support plate (4) and the top of the column (3). Multiple limiting pads (5) are detachably installed in the gap. An audible and visual alarm (6) is fixedly installed on one side of the column (3).

2. The finishing mill roll breakage protection mechanism according to claim 1, characterized in that, The pressure sensor (2) and the audible and visual alarm (6) are electrically connected to the PLC controller (7).

3. The finishing mill roll breakage protection mechanism according to claim 1, characterized in that, The limiting pad (5) is provided with a U-shaped groove (501) for the guide rod (401) to pass through.

4. The finishing mill roll breakage protection mechanism according to claim 1, characterized in that, The thickness of a single limiting pad (5) is 1 mm.

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