Pickling and rolling line

Abstract

The utility model discloses a kind of acid continuous rolling production lines, including uncoiler, positioning straightening device, cutting device, inlet loop, pickling device, rinsing device, drying device, outlet loop, trimming device and rolling mill unit arranged in sequence;The acidic device is integrally arranged with the rinsing device, and is supported and fixed by unified rack, the uncoiler, the inlet loop and the outlet loop all adopt vertical multilayer structure, to make multiple devices gradient arrangement, wherein, the uncoiler, the positioning straightening device, the cutting device are located in the highest first gradient, the pickling device, the rinsing device, the drying device are located in the second gradient of intermediate height, the trimming device and the rolling mill unit are located in the third gradient of the shortest, and the third gradient contacts ground base.

Description

Technical Field

[0001] This utility model relates to the field of steel strip processing technology, and in particular to an acid continuous rolling production line. Background Technology

[0002] In traditional steel strip pickling and rolling processes, each production unit is typically arranged independently, resulting in a large footprint and poor overall stability during operation due to their dispersed nature. For example, the uncoiler, pickling unit, and rolling mill each occupy significant space, and their connections and supports are not sufficiently compact. During high-speed strip movement and complex processes, vibrations and misalignments are prone to occur, impacting production efficiency and product quality. Furthermore, with increasingly scarce land resources, traditional layouts struggle to meet the demands of modern production for efficient space utilization. Utility Model Content

[0003] This invention aims to solve at least one of the technical problems existing in the prior art. To this end, this invention proposes a continuous acid rolling production line that, through a reasonable equipment layout and structural design, achieves the technical effects of saving floor space and increasing unit stability, thereby improving production efficiency and product quality.

[0004] According to a first aspect of the present invention, a continuous pickling and rolling production line includes, in sequence, an uncoiling device, a positioning and straightening device, a cutting device, an inlet looper, a pickling device, a rinsing device, a drying device, an outlet looper, an edge trimming device, and a rolling mill. The pickling device and the rinsing device are integrated and supported and fixed by a unified frame. The uncoiling device, the inlet looper, and the outlet looper all adopt a vertical multi-layer structure so that multiple devices are arranged in a gradient. The uncoiling device, the positioning and straightening device, and the cutting device are located at the highest first gradient; the pickling device, the rinsing device, and the drying device are located at the middle second gradient; and the edge trimming device and the rolling mill are located at the lowest third gradient. The third gradient is in contact with the foundation.

[0005] The pickling and rolling production line according to this utility model embodiment has at least the following beneficial effects: By integrating the pickling and rinsing devices and adopting a gradient-type multi-layer structure for the uncoiling device, inlet looper, and outlet looper, multiple devices are arranged in a gradient manner, making full use of vertical space and reducing the horizontal spacing between devices. Compared with traditional layout methods, this saves floor space, effectively solving the problem of scarce land resources and reducing the company's production costs. The lower third gradient directly contacts the foundation, providing stable foundation support for the entire unit. Simultaneously, through reasonable structural design and connection methods, the weight of the upper devices is transferred to the lower layer and the foundation, reducing vibration and offset during production operation. In complex processes such as high-speed rolling, the stability of the unit is significantly enhanced, and the steel strip runs more smoothly, thereby improving product quality and production efficiency, and reducing equipment failure rate and maintenance costs. Furthermore, due to increased unit stability, production interruptions and adjustment time caused by equipment vibration and offset are reduced, allowing the steel strip to pass through each production process continuously and stably, improving production efficiency. At the same time, the compact layout also shortens the transmission distance of the steel strip between devices, further improving production efficiency.

[0006] According to some embodiments of the present invention, the pickling device includes a plurality of pickling tanks arranged in a linear arrangement, and the rinsing device includes a plurality of rinsing tanks arranged in a linear arrangement, wherein the rinsing tanks and the pickling tanks are arranged side by side on the same straight line.

[0007] According to some embodiments of the present invention, the pickling apparatus further includes an acid tank, a filter, and a diaphragm pump; the acid tank is arranged below the pickling tank or adjacent to the side of the pickling tank; three filters are provided and connected in parallel between the acid tank and the pickling tank via pipes; the bottom outlet of each filter is connected to the inlet of the diaphragm pump via an independent pipe, and the outlet pipe of the diaphragm pump is connected to the return port of the acid tank.

[0008] According to some embodiments of the present invention, the upper part of the pickling tank is provided with a blowing assembly, which includes a first horizontal pipe and a second horizontal pipe. The first horizontal pipe and the second horizontal pipe are provided with a plurality of nozzles. The first horizontal pipe is connected to an air inlet pipe, and the second horizontal pipe is connected to a water inlet pipe, for spraying air or water onto the surface of the steel strip to remove residual acid.

[0009] According to some embodiments of the present invention, the drying device includes a drying oven, in which a plurality of drying rollers are arranged in a staggered manner for contacting the surface of the steel strip and heating and drying it.

[0010] According to some embodiments of the present invention, a connecting and guiding mechanism is provided between the outlet looper and the rolling mill, and between the inlet looper and the pickling device; the connecting and guiding mechanism includes multiple tension rollers; the multiple tension rollers are used to guide the movement direction of the steel strip.

[0011] According to some embodiments of the present invention, a winding device is also included, which is disposed at the rear end of the rolling mill and is used to wind up the rolled strip.

[0012] According to some embodiments of the present invention, the rolling mill unit includes multiple cold rolling mills arranged in parallel. The multiple cold rolling mills are fixedly installed by a base, and the base is provided with a detachable connecting component for switching whether to skip some rolling processes according to the product type.

[0013] Additional aspects and advantages of this invention will be set forth in part in the description which follows, and in part will be obvious from the description, or may be learned by practice of the invention. Attached Figure Description

[0014] The present invention will be further described below with reference to the accompanying drawings and embodiments, wherein: Figure 1 This is a schematic diagram of the acid continuous rolling production line according to an embodiment of the present invention.

[0015] Reference numerals: Frame 1000; Uncoiling device 100; Positioning and straightening device 200; Cutting device 300; Pickling device 400; Acid tank 410; Rinsing device 500; Drying device 600; Edge trimming device 700; Rolling mill 800; Cold rolling mill 810; Base 811; Connecting assembly 812; Rewinding device 900. Detailed Implementation

[0016] The embodiments of this utility model are described in detail below. Examples of these embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals denote the same or similar elements or elements having the same or similar functions throughout. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain this utility model, and should not be construed as limiting this utility model.

[0017] In the description of this utility model, it should be understood that the directional descriptions, such as up, down, front, back, left, right, etc., indicate the directional or positional relationship based on the directional or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this utility model.

[0018] In the description of this utility model, "several" means one or more, "multiple" means two or more, "greater than," "less than," and "exceeding" are understood to exclude the stated number, while "above," "below," and "within" are understood to include the stated number. If "first" or "second" is used in the description, it is only for the purpose of distinguishing technical features and should not be construed as indicating or implying relative importance, or implicitly indicating the number of indicated technical features, or implicitly indicating the order of the indicated technical features.

[0019] In the description of this utility model, unless otherwise explicitly defined, terms such as "setting," "installation," and "connection" should be interpreted broadly. Those skilled in the art can reasonably determine the specific meaning of these terms in this utility model based on the specific content of the technical solution. In the description of this utility model, the terms "one embodiment," "some embodiments," "illustrative embodiment," "example," "specific example," or "some examples," etc., refer to specific features, structures, materials, or characteristics described in connection with that embodiment or example, which are included in at least one embodiment or example of this utility model. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described can be combined in any suitable manner in one or more embodiments or examples. In the description of this specification, the terms "one embodiment," "some embodiments," "illustrative embodiment," "example," "specific example," or "some examples," etc., refer to specific features, structures, materials, or characteristics described in connection with that embodiment or example, which are included in at least one embodiment or example of this utility model. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples.

[0020] Reference Figure 1 The present invention provides a continuous acid rolling production line, comprising an uncoiling device 100, a positioning and straightening device 200, a cutting device 300, an inlet looper, an acid pickling device 400, a rinsing device 500, a drying device 600, an outlet looper, an edge trimming device 700, and a rolling mill 800 arranged in sequence.

[0021] The pickling unit 400 and the rinsing unit 500 are integrated and supported by a unified frame 1000. This integrated arrangement combines the originally independent pickling and rinsing functions into one area, reducing the space between the equipment. At the same time, the unified frame 1000 provides a stable support structure for the two units, enhancing the connectivity and overall integrity between the units.

[0022] The uncoiling device 100, inlet looper, and outlet looper all adopt a vertical multi-layer structure to arrange multiple devices in a gradient manner. Specifically, the gradient distribution is as follows: the uncoiling device 100, positioning and straightening device 200, and cutting device 300 are located at the highest first gradient; the pickling device 400, rinsing device 500, and drying device 600 are located at the middle second gradient; and the edge trimming device 700 and rolling mill 800 are located at the lowest third gradient, which is in contact with the foundation. This gradient arrangement makes full use of vertical space, arranging devices with different functions in a reasonable order and height, significantly reducing the horizontal footprint of the entire production line. Simultaneously, the lower third gradient, in direct contact with the foundation, provides stable foundation support for the entire unit, while the weight of the upper devices is transferred to the lower layers and the foundation through a reasonable structure, further increasing the stability of the unit.

[0023] In a specific embodiment, firstly, an uncoiling device 100 is installed, designed as a three-layer gradient structure. The uncoiling device 100 is installed at the highest first gradient position, followed by a positioning and straightening device 200 and a cutting device 300. The positioning and straightening device 200 positions and straightens the uncoiled steel strip to ensure its flatness and straightness, while the cutting device 300 cuts the steel strip according to production requirements. Next, an acid pickling device 400 and a rinsing device 500 are installed at the middle second gradient, integrated on a single frame 1000. The acid pickling device 400 pickles the steel strip to remove surface impurities such as iron oxide scale, and the rinsing device 500 then cleans the pickled steel strip to remove residual acid. A drying device 600 is also installed at the second gradient to dry the rinsed steel strip, preventing rust. The inlet and outlet loopers are designed with a vertical multi-layer structure. The inlet looper, located between the first and second gradients, regulates the tension of the steel strip before it enters the pickling unit 400, ensuring smooth operation. The outlet looper, located between the second and third gradients, regulates the tension of the steel strip after it exits the drying unit 600, preparing it for subsequent trimming and rolling processes. Finally, the trimming device 700 and the rolling mill 800 are installed at the lowest third gradient, which is directly in contact with the foundation. The trimming device 700 trims the dried steel strip, removing irregular edges, while the rolling mill 800 rolls the trimmed strip to achieve the required thickness and properties.

[0024] During production, the steel strip undergoes a series of processes including uncoiling, positioning and straightening, cutting, entering the inlet looper, pickling, rinsing, drying, entering the outlet looper, edge trimming, and rolling. Due to the gradient layout and integrated design of the various units, the entire production line occupies less floor space than traditional layouts. Furthermore, the third gradient directly contacts the foundation, providing a stable base for the unit. During high-speed rolling, the unit's vibration is significantly reduced, the steel strip runs more smoothly, and the product quality is significantly improved.

[0025] Understandably, by integrating the pickling unit 400 and rinsing unit 500, and employing a gradient-structured multi-layered uncoiling unit 100, inlet looper, and outlet looper, the multiple units are arranged in a gradient manner. This fully utilizes vertical space, reduces the horizontal spacing between units, saves floor space compared to traditional layouts, effectively addresses land scarcity, and lowers production costs. The lower third gradient directly contacts the foundation, providing stable foundation support for the entire unit. Simultaneously, through rational structural design and connection methods, the weight of the upper units is transferred to the lower units and the foundation, reducing vibration and misalignment during operation. In complex processes such as high-speed rolling, the unit's stability is significantly enhanced, resulting in smoother strip movement, improved product quality and production efficiency, and reduced equipment failure rates and maintenance costs. Furthermore, increased unit stability reduces production interruptions and adjustment time caused by equipment vibration and misalignment, allowing the strip to pass continuously and stably through each production process, improving production efficiency. The compact layout also shortens the strip transmission distance between units, further enhancing production efficiency.

[0026] Reference Figure 1 It should be noted that the pickling unit 400 has multiple pickling tanks arranged in a linear pattern, and the rinsing unit 500 has multiple rinsing tanks arranged in a linear pattern. These multiple rinsing tanks and multiple pickling tanks are arranged side-by-side on the same straight line and uniformly mounted on a large integrated frame 1000. The steel strip sequentially passes through the first pickling tank, the second pickling tank, the third pickling tank, or more pickling tanks for pickling treatment to remove surface iron oxide scale and other impurities. Immediately afterwards, it sequentially enters the first rinsing tank, the second rinsing tank, or more rinsing tanks for rinsing to remove residual acid. Throughout the process, the steel strip runs smoothly in the linearly arranged pickling and rinsing tanks without the need for complex turning operations. This layout makes the running path of the steel strip during pickling and rinsing more concise and smooth, reducing problems such as abrasion and deviation that may occur during turning, and improving the surface quality of the steel strip. At the same time, the compact structure of the linearly arranged and side-by-side arrangement further saves the floor space of the production line, which is beneficial for arranging more production equipment or reserving maintenance passages within a limited space.

[0027] It should be noted that in some embodiments, the pickling device 400, in addition to the linearly arranged pickling tanks, is also equipped with an acid tank 410, filters, and a diaphragm pump. The acid tank 410 is positioned below the pickling tank for convenient acid delivery and return. Three filters are installed in parallel and connected to the acid tank 410 and the pickling tank via pipelines. The bottom outlet of each filter is connected to the inlet of the diaphragm pump via an independent pipeline, and the outlet pipeline of the diaphragm pump is connected to the return port of the acid tank 410. During production, the acid in the acid tank 410 enters the filters through pipelines for filtration, removing impurities and iron filings. The filtered clean acid is then pumped back to the acid tank 410 by the diaphragm pump and then transported from the acid tank 410 to the pickling tank for steel strip pickling. When one filter needs cleaning or maintenance, the valve corresponding to that filter can be closed independently without affecting the normal operation of other filters and the entire acid circulation system. The parallel connection of the three filters improves the efficiency and reliability of acid filtration. Even if one filter malfunctions or requires maintenance, the other two filters can still function normally, ensuring the continuous operation of the acid circulation system and reducing production downtime caused by filter problems. Meanwhile, the optimized layout of the acid tank 410, filters, and diaphragm pumps ensures smoother acid circulation, providing clean acid to the pickling tank in a timely manner, guaranteeing the pickling effect and improving the quality of steel strip pickling.

[0028] In some embodiments, a blowing assembly is installed on the upper part of the pickling tank. The first horizontal pipe of the blowing assembly is connected to an air inlet pipe, and the second horizontal pipe is connected to a water inlet pipe. Multiple nozzles are evenly distributed on both the first and second horizontal pipes. After the steel strip has completed pickling in the pickling tank, before entering the rinsing process, the air inlet valve of the first horizontal pipe is opened, and the nozzles spray high-pressure gas onto the surface of the steel strip, blowing off most of the residual acid. Then, the water inlet valve of the second horizontal pipe is opened, and the nozzles spray water onto the surface of the steel strip, further rinsing away residual acid and impurities. After being treated by the blowing assembly, the steel strip has significantly less residual acid on its surface. Entering the rinsing tank for deep rinsing greatly improves rinsing efficiency and quality. The blowing assembly effectively removes a large amount of residual acid from the surface of the steel strip after pickling, reducing the amount of acid entering the rinsing tank, lowering the load on the rinsing tank, and improving the rinsing effect. Meanwhile, the process of spraying air first and then water can more thoroughly clean the surface of the steel strip, avoid the adverse effects of acid residue on subsequent processes and steel strip quality, and improve the product quality stability of the entire acid rolling production line.

[0029] Reference Figure 1It should be noted that the drying device 600 employs an oven structure with multiple staggered drying rollers inside. The steel strip enters from one end of the oven and passes around these drying rollers sequentially, making full contact with their surfaces. A heating medium (such as steam or heat transfer oil) circulates inside the drying rollers, transferring heat to the steel strip through heat conduction, causing the moisture on the steel strip surface to evaporate rapidly. Due to the staggered arrangement of the drying rollers, the steel strip's path within the oven is wavy, increasing the contact area and contact time between the steel strip and the drying rollers, thus improving drying efficiency. After drying, the steel strip exits from the other end of the oven with a dry and clean surface, ready to proceed directly to the next process. The staggered arrangement of the drying rollers ensures full contact between the steel strip and the drying rollers within the oven, increasing the heat exchange area and time, improving drying efficiency, and ensuring that the moisture on the steel strip surface is dried quickly and thoroughly. Simultaneously, this arrangement also provides some tension and guidance for the steel strip, preventing problems such as deviation and wrinkling during the drying process, ensuring the flatness and quality of the steel strip.

[0030] In some embodiments, connecting and guiding mechanisms are provided between the outlet looper and the rolling mill 800, and between the inlet looper and the pickling unit 400. These connecting and guiding mechanisms consist of multiple tension rollers, which are fixedly installed at corresponding positions by brackets. In some embodiments, three tension rollers are provided. When the steel strip exits the outlet looper and enters the rolling mill 800, it first passes around the first tension roller, then the second, and finally the third tension roller before entering the rolling mill 800. Similarly, when the steel strip exits the inlet looper and enters the pickling unit 400, it is also guided by these three tension rollers. By adjusting the position and tension of the tension rollers, the tension and running direction of the steel strip can be controlled, allowing the steel strip to enter subsequent processes smoothly and accurately.

[0031] The connecting guide mechanism effectively guides the movement of the steel strip, ensuring a smooth transition between different devices and preventing problems such as jamming and abrasion caused by directional deviations. Simultaneously, the tension roller adjusts the steel strip tension, maintaining a suitable tension during operation and improving operational stability and product quality. This is particularly beneficial during production line start-up, shutdown, or speed changes, allowing for better control of the steel strip tension and reducing quality issues such as stretching and deformation.

[0032] Reference Figure 1The acid-rolling production line proposed in this utility model also includes a coiling device 900. The coiling device 900 mainly consists of a coiling shaft, a drive motor, a reducer, and a control system. After the steel strip is rolled by the rolling mill 800, it enters the coiling device 900. The drive motor drives the coiling shaft to rotate through the reducer, neatly coiling the rolled strip onto the shaft. The control system can precisely control the coiling speed and tension according to production requirements, ensuring that the strip is tightly and neatly coiled, avoiding problems such as loose coils and tapered coils. Simultaneously, the coiling device 900 is also equipped with an automatic coil changing function. After one coil of strip is coiled, it can automatically cut the strip and begin the coiling operation for a new coil, improving the degree of automation and production efficiency. The coiling device 900 enables neat coiling of the rolled strip, facilitating subsequent storage, transportation, and further processing. Automated coiling operations reduce manual intervention, improving production efficiency and product quality stability. Meanwhile, precise winding speed and tension control can ensure the quality of strip winding, avoid strip damage and waste caused by improper winding, and reduce production costs.

[0033] Reference Figure 1 The rolling mill 800 includes multiple cold rolling mills 810 arranged side-by-side, which are fixedly mounted on a base 811. The base 811 is equipped with a detachable connecting assembly 812, which consists of a connecting plate, bolts, and nuts. When producing certain special grades of strip steel that do not require all rolling processes, for example, only the first two cold rolling mills 810 are needed, the connecting assemblies 812 between the third and fourth cold rolling mills 810 and the base 811 can be removed, and these two cold rolling mills 810 can be removed from the production line, allowing the steel strip to exit directly from the second cold rolling mill 810 and enter subsequent processes. When it is necessary to resume all rolling processes, the remaining cold rolling mills 810 are reinstalled on the base 811 via the connecting assemblies 812. The detachable connecting assembly 812 design allows the rolling mill 800 to flexibly switch between skipping certain rolling processes depending on the product type, improving the adaptability and flexibility of the production line. For the production of strip steel with special specifications or requirements, there is no need for large-scale modification or adjustment of the entire production line. Simply disassembling and installing some equipment can meet production needs, greatly shortening production preparation time and reducing production costs. At the same time, this design also facilitates equipment maintenance and repair. When a cold rolling mill 810 malfunctions, it can be easily disassembled for repair without affecting the normal operation of other equipment.

[0034] The embodiments of the present utility model have been described in detail above with reference to the accompanying drawings. However, the present utility model is not limited to the above embodiments. Within the scope of knowledge possessed by those skilled in the art, various changes can be made without departing from the spirit of the present utility model.

Claims

1. A continuous acid rolling production line, characterized in that, The system includes, in sequence, an uncoiling device, a positioning and straightening device, a cutting device, an inlet looper, a pickling device, a rinsing device, a drying device, an outlet looper, an edge trimming device, and a rolling mill. The pickling device and the rinsing device are integrated and supported by a unified frame. The uncoiling device, the inlet looper, and the outlet looper all adopt a vertical multi-layer structure to arrange the multiple devices in a gradient manner. The uncoiling device, the positioning and straightening device, and the cutting device are located at the highest first gradient; the pickling device, the rinsing device, and the drying device are located at the middle second gradient; and the edge trimming device and the rolling mill are located at the lowest third gradient, which is in contact with the foundation.

2. The acid continuous rolling production line according to claim 1, characterized in that, The pickling device includes multiple pickling tanks arranged in a linear arrangement, and the rinsing device includes multiple rinsing tanks arranged in a linear arrangement. The rinsing tanks and the pickling tanks are arranged side by side on the same straight line.

3. The acid continuous rolling production line according to claim 2, characterized in that, The pickling apparatus also includes an acid tank, filters, and a diaphragm pump; the acid tank is arranged below the pickling tank or adjacent to the side of the pickling tank; three filters are provided and connected in parallel between the acid tank and the pickling tank via pipelines; the bottom outlet of each filter is connected to the inlet of the diaphragm pump via an independent pipeline, and the outlet pipeline of the diaphragm pump is connected to the return port of the acid tank.

4. The acid continuous rolling production line according to claim 3, characterized in that, The upper part of the pickling tank is provided with a blowing assembly, which includes a first horizontal pipe and a second horizontal pipe. The first horizontal pipe and the second horizontal pipe are provided with multiple nozzles. The first horizontal pipe is connected to an air inlet pipe, and the second horizontal pipe is connected to a water inlet pipe. It is used to spray air or water onto the surface of the steel strip to remove residual acid.

5. The acid continuous rolling production line according to claim 1, characterized in that, The drying device includes an oven, which contains multiple staggered drying rollers for contacting the surface of the steel strip and heating and drying it.

6. The acid continuous rolling production line according to claim 1, characterized in that, A connecting and guiding mechanism is provided between the outlet looper and the rolling mill, and between the inlet looper and the pickling device; the connecting and guiding mechanism includes multiple tension rollers; the multiple tension rollers are used to guide the movement direction of the steel strip.

7. The acid continuous rolling production line according to claim 1, characterized in that, It also includes a winding device, which is located at the rear end of the rolling mill and is used to wind up the rolled strip.

8. The acid continuous rolling production line according to claim 1, characterized in that, The rolling mill unit includes multiple cold rolling mills arranged in parallel. The multiple cold rolling mills are fixedly installed by a base, and the base is provided with a detachable connecting component for switching whether to skip some rolling processes according to the product type.

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