Device for cleaning foreign matters on lower step pad of hot-rolled strip steel

Abstract

The utility model discloses a device for cleaning foreign matters on a lower step pad of hot-rolled strip steel, which belongs to the technical field of hot-rolled strip steel and comprises a roll changing trolley arranged below the lower step pad, and the lower step pad comprises a used section and an unused section. Comprising a water pipe on the roll changing vehicle, and the water pipe is connected with a water supply system through an electromagnetic valve; the water pipe comprises a vertical section and a horizontal section, the vertical section is fixed on the roll changing trolley, the horizontal section and the vertical section are connected at an angle of 90 degrees and extend to the same width as the lower step pad, and a water nozzle is arranged on the horizontal section; the water nozzle is inclined downwards, and the included angle between the spraying direction of the water nozzle and the horizontal plane is 30-60 degrees; a first displacement sensor is arranged on the lower supporting roller lifting cylinder, and a second displacement sensor is arranged on the oil cylinder. The sensor is connected to the input end of the PLC, and the output end of the PLC is connected with the operation table; the lower step pad foreign matter cleaning device solves the technical problems that in the hot rolling strip steel production process, the lower step pad foreign matter cleaning efficiency is low, the safety risk is large, and the cleaning quality is unstable.

Description

TECHNICAL FIELD

[0001] The utility model belongs to hot rolled strip steel technical field especially relates to a device of cleaning foreign matter of hot rolled strip steel lower ladder pad. BACKGROUND

[0002] In the production process of hot rolled strip steel, the lower support roller ladder pad of finishing mill set is an important component, which supports the work roller and can adjust the gear position according to the roller diameter of the work roller. In the production process of hot rolled strip steel, due to the high temperature contact of the work roller and the strip steel, a large amount of iron oxide scale is generated, which is easy to fall and adhere to the surface of the lower ladder pad. At the same time, the cooling liquid, lubricating oil and other substances used in the rolling process will mix with the iron oxide scale and form a difficult-to-remove scale on the surface of the ladder pad. The existence of these foreign matters not only affects the normal work of the ladder pad, but also causes the instability of the work roller support, thereby affecting the quality of the rolled products.

[0003] The traditional cleaning method mainly relies on manual operation, and the operator needs to enter the rolling mill area after the equipment is shut down, and uses shovel, steel wire brush and other tools for manual cleaning. This method has the following disadvantages:

[0004] 1. The operator needs to enter the rolling mill area after the equipment is shut down, and uses shovel, steel wire brush and other tools for manual cleaning. The cleaning operation can be carried out only once every 15 days, and each cleaning needs to stop for 2-3 hours; the annual average downtime reaches 48-72 hours, which seriously affects the production efficiency; and this low-frequency cleaning method causes the continuous accumulation and hardening of foreign matters on the surface of the ladder pad, increases the cleaning difficulty, and the cleaning quality is unstable; incomplete cleaning affects the roll changing accuracy, causes the quality fluctuation of the rolled products, and increases the scrap rate;

[0005] 2. Even in the shutdown state, the equipment still has high residual temperature, and the environmental temperature is usually between 40-50℃; the operator must wear heavy protective clothing to work in the high-temperature and humid environment; the working space is small, which easily causes injury due to improper posture; the dust and water vapor generated during the cleaning process affect the operator's vision; the use of shovel and other tools easily damages the surface of the ladder pad, and frequent replacement of protective equipment and cleaning tools generates additional maintenance cost.

[0006] Therefore, it is urgent to develop an automatic cleaning device that can replace manual operation, improve cleaning efficiency and ensure operation safety to solve the above problems. UTILITY MODEL CONTENTS

[0007] The utility model aims at providing a device for cleaning foreign matter of hot rolled strip steel lower ladder pad to solve the technical problems of low efficiency, high safety risk and unstable cleaning quality of foreign matter cleaning of hot rolled strip steel lower ladder pad in the background technology.

[0008] In order to achieve the above object, the utility model provides the following technical scheme:

[0009] A device for cleaning foreign matters of a lower step pad of a hot-rolled strip steel, comprising a roll changing trolley arranged below the lower step pad, wherein the lower step pad comprises a used section and an unused section; further comprising a water pipe on the roll changing trolley, wherein the water pipe is connected with a water supply system through an electromagnetic valve; the water pipe comprises a vertical section and a horizontal section, the vertical section is fixed on the roll changing trolley, the horizontal section is connected with the vertical section at an angle of 90 degrees and extends to the same width as the lower step pad, and a plurality of water nozzles are arranged on the horizontal section; the water nozzles are arranged in a downward inclined manner, and the angle between the jet direction of the water nozzles and the horizontal plane is 30-60 degrees.

[0010] A first displacement sensor is arranged on a lifting cylinder of a lower support roller of the lower step pad, and a second displacement sensor is arranged on an oil cylinder of the lower step pad; the first displacement sensor and the second displacement sensor are connected in wires to the input end of a PLC, and the output end of the PLC is connected with an operation table; the operation table is connected with the electromagnetic valve through a data line.

[0011] Preferably, protective covers are arranged at the two ends of the lower step pad respectively, and a cover plate is arranged at the joint of the used section and the unused section of the lower step pad.

[0012] Preferably, the horizontal section of the water pipe is fixed on the edge of the protective cover and / or the cover plate through welding.

[0013] Preferably, a plurality of water nozzles are arranged on the horizontal section along the length direction of the horizontal section.

[0014] Preferably, the water supply system comprises a high-pressure water pipe; the water pipe is connected with a steel wire hose through a quick connector, the steel wire hose is connected with the electromagnetic valve through a screw joint, and the electromagnetic valve is connected with the high-pressure water pipe through welding.

[0015] Preferably, the electromagnetic valve is a 2W350-35 normally closed electromagnetic valve, the water pipe is a DN32 iron pipe, and the steel wire hose is a DN35 steel wire reinforced rubber hose.

[0016] Preferably, the water nozzles are connected with the horizontal section of the water pipe through screw joints.

[0017] Preferably, the angle between the jet direction of the water nozzles and the horizontal plane is 30 degrees or 60 degrees.

[0018] Compared with the prior art, the utility model has the beneficial effects that:

[0019] The device for cleaning foreign matters of a lower step pad of a hot-rolled strip steel provided by the utility model successfully solves the technical problems of low efficiency, great safety risk and unstable cleaning quality in the cleaning of foreign matters of a lower step pad in the production process of a hot-rolled strip steel, and realizes the automation and intelligentization of the cleaning process.

[0020] First, in view of the problem of low cleaning efficiency, the utility model adopts the water pipe system on the roller changing trolley to cooperate with multiple evenly distributed water nozzles, realizes full coverage cleaning, improves the cleaning frequency from once every 15 days to at least three times a day, and greatly shortens the cleaning time each time, significantly reduces the annual downtime. Secondly, in view of the operation safety problem, the device adopts a full-automatic cleaning mode, avoiding the risk of personnel entering the high-temperature environment for operation. Thirdly, in view of the problem of unstable cleaning quality, by setting two displacement sensors and cooperating with PLC, the cleaning process is accurately controlled; at the same time, the scientific spray angle design of the water nozzle 30-60 degrees ensures that the cleaning strength is moderate, which can effectively remove foreign matter and will not damage the equipment surface. In addition, in terms of structure protection, by setting a protective cover and a cover plate, the problem of water splashing during cleaning is effectively solved, and the protective cover also plays a protective role on the pipeline system. The welding and fixing mode of the water pipe and the cover plate edge ensures the stability of the whole system operation.

[0021] In general, the utility model not only significantly improves the operation efficiency of the production line and reduces the equipment maintenance cost, but also improves the stability of product quality, improves the working environment through the automatic and intelligent cleaning scheme, and has significant economic and social benefits. BRIEF DESCRIPTION OF DRAWINGS

[0022] Fig. 1 It is a front view of the preferred embodiment of the utility model;

[0023] Fig. 2 It is a top view of the preferred embodiment of the utility model;

[0024] In the figure: 1, water pipe; 2, electromagnetic valve; 3, water nozzle; 4, protective cover; 5, cover plate; 6, high-pressure water pipe; 7, steel wire hose; 8, lower ladder pad. DETAILED DESCRIPTION

[0025] The technical scheme in the embodiments of the utility model will be described clearly and completely in combination with the drawings in the embodiments of the utility model, and all other embodiments obtained by the person skilled in the art on the premise of not making creative labor belong to the protection scope of the utility model based on the embodiments in the utility model.

[0026] As Figs. 1-2 shown:

[0027] In the production of hot-rolled strip steel, the high-speed running rolling mill will produce a large amount of iron oxide scale. These iron oxide scales will be deposited on different levels of the lower step pad 8 under the scouring action of the cooling water. At the same time, due to the humid production environment, the step pad cover plate 5 is prone to rust, and under the action of the rolling mill vibration, the rust will fall off to the surface of the step pad. If these foreign matters are not cleaned in time, it will cause uneven contact between the support roller and the step pad, affecting the rolling precision.

[0028] A device for cleaning foreign matters of the lower step pad of hot-rolled strip steel, comprising a roll changing trolley arranged below the lower step pad 8, the lower step pad 8 comprising a used section and an unused section; further comprising a water pipe 1 on the roll changing trolley, the water pipe 1 being connected with the water supply system through an electromagnetic valve 2; the water pipe 1 comprises a vertical section and a horizontal section, the vertical section being fixed on the roll changing trolley, the horizontal section being connected with the vertical section at 90 degrees and extending to the same width as the lower step pad 8, a plurality of water nozzles 3 being fixed on the horizontal section through threads; the water nozzles 3 are arranged downwardly, the included angle between the spraying direction of the water nozzles 3 and the horizontal plane being 30-60 degrees, including 30 degrees and 60 degrees.

[0029] A first displacement sensor is arranged on the lower support roller lifting cylinder of the lower step pad 8, and a second displacement sensor is arranged on the oil cylinder of the lower step pad 8; the first displacement sensor and the second displacement sensor are wired to the input end of the PLC, and the output end of the PLC is connected with the operation table; the displacement sensor used in the embodiment is a magnetostrictive displacement sensor TT2HM-1710M-1-RPO7-S1011G6TT, and the PLC is a SIMATIC S7-200 SMART.

[0030] Specifically, when the work roller of the hot rolling mill is replaced, the lower support roller lifting cylinder needs to be raised to make the lower support roller separate from the step pad, and when the first displacement sensor detects the lifting of the lower support roller lifting cylinder, a lower support roller lifting signal is sent to the PLC; after the operator adjusts the lower step pad 8 to the level suitable for the diameter of the new work roller, the second displacement sensor detects that the lower step pad 8 is in place, and a lower step pad in place signal is sent to the PLC; after the PLC receives the lower support roller lifting signal and the lower step pad in place signal at the same time, an electromagnetic valve opening signal is sent to the operation table, and the operator manually controls the electromagnetic valve 2 to open after receiving the electromagnetic valve opening signal.

[0031] Protective covers 4 are arranged at both ends of the lower step pad 8 respectively, for covering the unused section of the lower step pad 8, to avoid direct contact of the unused section with water; a cover plate 5 is arranged at the joint of the used section and the unused section of the lower step pad 8, for preventing the cleaning water from entering the connecting part of the lower step pad 8. The horizontal section of the water pipe 1 is fixed on the edge of the cover plate 5 by welding. A plurality of water nozzles 3 are uniformly arranged on the horizontal section along the length direction thereof.

[0032] The water supply system comprises a high-pressure water pipe 6; the water pipe 1 is connected with a steel wire hose 7 through a quick connector, the steel wire hose 7 is connected with an electromagnetic valve 2 through a screw joint, and the electromagnetic valve 2 is welded with the high-pressure water pipe 6. The device uses the high-pressure water flushing principle for cleaning. When the high-pressure water is sprayed from the water nozzle 3, the water flow speed is significantly increased through the contraction structure of the water nozzle, and the kinetic energy is increased. When the high-speed water flow hits the surface of the ladder pad, a large impact force is generated, which can effectively break the adhesion between the foreign matters such as iron oxide scale and the surface of the ladder pad. At the same time, the continuous water flow flushing action can quickly take the loosened foreign matters away from the surface of the ladder pad.

[0033] The high-pressure water pipe 6 adopts a seamless steel pipe, which can withstand a water pressure of more than 2.0 MPa. The electromagnetic valve 2 selects a normally closed type 2W350-35 model, and the rated working pressure is 3.5 MPa, which can meet the high-pressure water flushing requirements. The conveying pipeline comprises a fixed pipeline and a flexible pipeline: the water pipe 1 adopts a DN32 iron pipe, which has sufficient mechanical strength; the steel wire hose 7 adopts a DN35 steel wire reinforced rubber hose, which has good flexibility.

[0034] The installation angle of the water nozzle 3 of the device is selected in the range of 30-60 degrees. The selection of this angle range is based on the following principle: when the water flow is sprayed at a certain angle to the solid surface, the efficiency of the water flow kinetic energy into impact force is closely related to the incident angle. When the angle is too small (less than 30 degrees), the water flow acts in a grazing manner, although the coverage area is large, but the impact force is insufficient, and it is difficult to effectively remove stubborn foreign matters; when the angle is too large (more than 60 degrees), the water flow nearly vertically impacts, although the local impact force is strong, but it is easy to cause water splashing, and it is not conducive to taking out the foreign matters with the water flow. Through fluid mechanics analysis and experimental verification, the incident angle of 30-60 degrees can achieve the best balance among the impact force, coverage range and foreign matter taking-out efficiency.

[0035] In the preferred embodiment, the angle of the water nozzle 3 can be set to 40-50 degrees. In this angle range, the water flow has moderate horizontal and vertical velocity components. The horizontal component helps to push the loosened foreign matters such as iron oxide scale to the discharge direction, and the vertical component provides sufficient impact force to break the adhesion between the foreign matters and the surface of the ladder pad. Practice shows that the flushing effect in this angle range is the most ideal, and the cleaning time can be generally controlled within 8-12 seconds.

[0036] The specific installation angle of the water nozzle 3 can be adjusted slightly according to the actual working conditions. The factors affecting the final angle selection include: the water supply pressure, the adhesion degree of foreign matters, the surface condition of the ladder pad, etc. The device is provided with an angle adjustment mechanism during installation, which can be adjusted by ±5 degrees within the specified range to adapt to the specific needs of different production lines.

[0037] Working principle:

[0038] The operator first confirms that the high-pressure water supply is normal, checks whether the system water pressure meets the requirements. The water pipe 1 is connected to the steel wire hose 7 through the quick connector, and the connection between the water pipe 1, the steel wire hose 7 and the high-pressure water pipe 6 is reliable and leak-free.

[0039] The stepped pad of the hot rolling mill is a device for supporting the work roll, and the height of the support step needs to be adjusted according to the different diameters of the work roll. In order to realize this height adjustment, the stepped pad adopts the oil cylinder driving mode.

[0040] When the work roll of the hot rolling mill is replaced, the lower support roll lifting cylinder needs to be raised to make the lower support roll separate from the stepped pad. When the No. 1 displacement sensor detects the lifting of the lower support roll lifting cylinder, it sends a lower support roll lifting signal to the PLC;

[0041] In this embodiment, the two lower stepped pads 8 on both sides are driven by a common oil cylinder, which is connected to the two lower stepped pads through a connecting rod mechanism, ensuring that the two lower stepped pads always move synchronously. After the operator adjusts the lower stepped pad 8 to the step suitable for the diameter of the new work roll, the No. 2 displacement sensor arranged on the oil cylinder detects that the lower stepped pad 8 is in place and sends a lower stepped pad in place signal to the PLC;

[0042] When the PLC receives the lower support roll lifting signal and the lower stepped pad in place signal at the same time, it sends an electromagnetic valve opening signal to the operation panel, and the operator manually controls the electromagnetic valve 2 to open after receiving the electromagnetic valve opening signal.

[0043] After the electromagnetic valve 2 is opened, the high-pressure water passes through the steel wire hose 7, the vertical and horizontal sections of the water pipe 1, and finally sprays out from the water nozzle 3.

[0044] The high-pressure water sprays onto the surface of the stepped pad at the optimal angle set by the operator according to the industrial setting. In this embodiment, the angle between the water nozzle and the horizontal plane is set to 50 degrees. The vertical component of the water flow produces a strong impact force, breaking the bonding force between the oxide scale and the surface; the horizontal component pushes the loose foreign matter in the discharge direction.

[0045] When the PLC does not receive the lower support roll lifting signal or the lower stepped pad in place signal, the PLC sends an electromagnetic valve closing signal to the operation panel, and the operator controls the electromagnetic valve 2 to close, stopping the high-pressure water spray. In actual operation, the entire cleaning process lasts for 8-12 seconds; after cleaning, the operator can visually check to confirm the cleaning effect, and if necessary, can adjust the angle of the water nozzle 3 (within ±5 degrees) for optimization.

[0046] After one cleaning is completed, the next work cycle is waited. If the support roll replacement operation is required, the connection between the water pipe 1 and the steel wire hose 7 can be disconnected through the quick connector.

[0047] The above merely describes preferred embodiments of the present application and is not intended to limit the present application, and any modification, equivalent replacement, and improvement within the spirit and principle of the present application shall be included in the protection scope of the present application.

Claims

1. A device for cleaning foreign matter from a lower step pad of a hot-rolled strip, comprising a roll-changing car provided below a lower step pad (8), said lower step pad (8) comprising a used section and an unused section; characterized in that, The water pipe (1) on the roll changing trolley is connected with the water supply system through the electromagnetic valve (2); the water pipe (1) comprises a vertical section and a horizontal section, the vertical section is fixed on the roll changing trolley, the horizontal section is connected with the vertical section at an angle of 90 degrees and extends to the same width as the lower ladder pad (8), and a plurality of water nozzles (3) are arranged on the horizontal section; the water nozzles (3) are arranged in a downward inclination, and the angle between the spray direction of the water nozzles (3) and the horizontal plane is 30-60 degrees. A first displacement sensor is arranged on the lifting cylinder of the lower support roller of the lower ladder pad (8), and a second displacement sensor is arranged on the oil cylinder of the lower ladder pad (8); the first displacement sensor and the second displacement sensor are connected to the input end of the PLC in a wired manner, and the output end of the PLC is connected to the operation table; the operation table is connected to the electromagnetic valve (2) through a data line.

2. The device for cleaning the foreign matter on the step-down pad of the hot-rolled steel strip according to claim 1, characterized in that, Protective covers (4) are arranged at the two ends of the lower ladder pad (8), and cover plates (5) are arranged at the junctions between the used section and the unused section of the lower ladder pad (8).

3. The device for cleaning the foreign matter on the step-down pad of the hot-rolled steel strip according to claim 2, characterized in that, The horizontal section of the water pipe (1) is fixed on the edge of the protective cover (4) and / or the cover plate (5) by welding.

4. The device for cleaning the foreign matter on the step-down pad of the hot-rolled steel strip according to claim 1, characterized in that, A plurality of water nozzles (3) are arranged on the horizontal section along the length direction.

5. The device for cleaning the foreign matter on the step-down pad of the hot-rolled steel strip according to claim 1, characterized in that, The water supply system comprises a high-pressure water pipe (6); the water pipe (1) is connected to the steel wire hose (7) through a quick connector, the steel wire hose (7) is connected to the electromagnetic valve (2) through a screw joint, and the electromagnetic valve (2) is welded to the high-pressure water pipe (6).

6. The device for cleaning the foreign matter on the step-down pad of the hot-rolled steel strip according to claim 5, characterized in that, The electromagnetic valve (2) is a 2W350-35 normally closed electromagnetic valve; the water pipe (1) is a DN32 iron pipe, and the steel wire hose (7) is a DN35 steel wire reinforced rubber hose.

7. The device for cleaning the foreign matter on the step-down pad of the hot-rolled steel strip according to claim 1, characterized in that, The water nozzles (3) are connected to the horizontal section of the water pipe (1) through a screw joint.

8. The device for cleaning the foreign matter on the step-down pad of the hot-rolled steel strip according to claim 1, characterized in that, The angle between the spray direction of the water nozzles (3) and the horizontal plane is 30 degrees or 60 degrees.

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