Steel belt pretreatment device before galvanization

Abstract

The utility model discloses a steel belt pretreatment device before galvanization, which comprises a drying box, a steel belt conveyed in the drying box along the length direction, and a waste heat absorption cavity arranged on the drying box and internally provided with a fan, the purging pipe is located at the output end of the drying box and communicates with the waste heat absorption cavity; the scraping plate is rotationally arranged on the purging pipe and keeps a preset distance with the bottom surface of the drying box, and the preset distance is consistent with the thickness of the steel belt. According to the steel belt pretreatment device before galvanization, in the steel belt conveying process, the steel belt is purged by the purging pipe, and dry impurities on the surface are blown off. And for the ground impurities, the scraping plate plays a part of scraping effect. And meanwhile, the temperature of airflow in the purging pipe is larger than that of outside air and smaller than that in the drying box, stepped cooling is conducted on the steel belt, a cooling transition section for the steel belt is formed, the problem of heat stress concentration can be weakened, and therefore the generation probability of cracks is reduced.

Description

Technical Field

[0001] This utility model relates to the field of steel strip galvanizing technology, and more specifically to a steel strip pretreatment device before galvanizing. Background Technology

[0002] Pretreatment of steel strips before galvanizing is a key step to ensure the quality of the galvanized layer. The equipment design must meet the requirements of high efficiency, environmental protection and stability. It usually includes uncoiling and straightening, degreasing and cleaning, pickling, water washing, fluxing treatment and drying.

[0003] Based on publication number CN217764300U, published on 2022-11-08, a steel belt drying pretreatment device is disclosed, including a box, a water-absorbing roller, a drying roller, and a drying device. The box is arranged vertically, with an opening in the middle for the steel belt to pass through horizontally. The water-absorbing roller is rotatably mounted on the box and symmetrically arranged on both sides of the steel belt. A soft water-absorbing cylinder is fixedly connected to the water-absorbing roller and rests against the steel belt. The drying roller is rotatably mounted on the box, with a diatomaceous earth cylinder fixedly connected to the drying roller and resting against the water-absorbing cylinder. The drying device is installed inside the box for drying the cylinder. This solves the problem that a long drying production line would increase the equipment cost for enterprises.

[0004] In the prior art, including the aforementioned patent, the steel strip can be preheated by a drying device, making it easier for impurities on the surface of the steel strip to dry and fall off, thus maintaining the cleanliness of the surface and forming a smooth galvanized surface during subsequent galvanizing. However, the drying roller only cleans by relative friction with the steel strip during the rolling process, which causes impurities on the surface of the steel strip to be crushed and adhered to the surface of the steel strip in a dry state, resulting in poor cleaning effect. Furthermore, when leaving the drying device, due to the large temperature difference between the outside air and the inside of the drying chamber, the steel strip experiences localized thermal stress concentration, which causes fine cracks, and impurities will penetrate into the cracks and corrode. Utility Model Content

[0005] The purpose of this invention is to provide a steel strip pretreatment device before galvanizing, in order to solve the above-mentioned problems.

[0006] To achieve the above objectives, this utility model provides the following technical solution: a steel strip pretreatment device before galvanizing, comprising a drying box and a steel strip conveyed along its length inside, including a waste heat absorption chamber disposed on the drying box, wherein a fan is disposed inside;

[0007] The purge pipe located at the output end of the drying oven is connected to the waste heat absorption chamber;

[0008] A scraper is rotatably mounted on the purge pipe and maintains a predetermined distance from the bottom of the drying chamber, and the predetermined distance is consistent with the thickness of the steel strip;

[0009] Mounting plates are fixedly installed on both sides of the drying chamber to support the purge pipes.

[0010] Preferably, the scraper is fixedly provided with a baffle for blocking the purge pipe, and the scraper is provided with an elastic element for maintaining a predetermined angle.

[0011] Preferably, the purging pipe has an arc-shaped air outlet for blowing towards the steel strip.

[0012] Preferably, the mounting plate is provided with a slide rail for adjusting the height of the scraper.

[0013] Preferably, the system also includes a support rod that is slidably mounted on the slide rail, and the purge pipe is rotatably mounted on the support rod and maintains a predetermined angle with the support rod.

[0014] Preferably, the mounting plate is provided with a limiting groove for the purge tube to slide.

[0015] Preferably, a guide plate for guiding the purge pipe is fixedly installed inside the limiting groove.

[0016] Preferably, the purge pipe is fixedly provided with a stop that cooperates with the guide plate.

[0017] Preferably, the included angle between the stop and the limiting groove is 15°-20°.

[0018] Preferably, a tension spring is provided between the purge tube and the support rod.

[0019] In the above technical solution, the steel strip pretreatment device provided by this utility model has the following beneficial effects: During the conveying process of the steel strip, the steel strip is swept by the blowing pipe, which blows off the dry impurities on the surface. For the crushed impurities, the scraper plays a partial scraping role. At the same time, the airflow temperature in the blowing pipe is higher than that of the outside air but lower than that in the drying oven, which provides a stepped cooling of the steel strip and forms a cooling transition section for the steel strip. This can reduce the problem of thermal stress concentration and thus reduce the probability of crack formation. Attached Figure Description

[0020] To more clearly illustrate the technical solutions in the embodiments of this application or the prior art, the drawings used in the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments recorded in this utility model. For those skilled in the art, other drawings can be obtained based on these drawings.

[0021] Figure 1 A three-dimensional schematic diagram of the overall embodiment of this utility model;

[0022] Figure 2This is a cross-sectional view of the inside of the drying oven provided in an embodiment of the present utility model;

[0023] Figure 3 This is a schematic diagram of the cross-sectional structure of the purge pipe provided in an embodiment of the present utility model;

[0024] Figure 4 This is a schematic diagram of the purge pipe and slide rail structure provided in an embodiment of the present utility model.

[0025] Explanation of reference numerals in the attached figures:

[0026] 1. Drying oven; 11. Heating element; 2. Waste heat absorption chamber; 21. Heat absorption port; 3. Purge pipe; 31. Arc-shaped air outlet; 32. Scraper; 33. Elastic element; 34. Baffle; 35. Stop; 36. Support rod; 37. Connecting seat; 4. Mounting plate; 41. Slide rail; 42. Limiting groove; 43. Guide plate. Detailed Implementation

[0027] To enable those skilled in the art to better understand the technical solution of this utility model, the present utility model will be further described in detail below with reference to the accompanying drawings.

[0028] like Figure 1-4 As shown, a steel strip pretreatment device before galvanizing includes a drying box 1 and a steel strip conveyed along its length inside the drying box 1, including a waste heat absorption chamber 2 set on the drying box 1, which is equipped with a fan.

[0029] The purge pipe 3, located at the output end of the drying oven 1, is connected to the waste heat absorption chamber 2;

[0030] A scraper 32 is rotatably mounted on the purge pipe 3 and maintains a predetermined distance from the bottom surface of the drying chamber 1, and the predetermined distance is consistent with the thickness of the steel strip.

[0031] Mounting plates 4 are fixedly installed on both sides of the drying chamber 1 to support the purge pipes 3.

[0032] Specifically, it also includes a heating element 11 fixedly installed inside the drying chamber 1. The heating element 11 can be a conventional heating method such as an electric heating wire or a resistance thermometer, and the heating element 11 and the purge pipe 3 are located at opposite ends inside the drying chamber 1. The steel belt being conveyed is dried by the heating element 11, the temperature inside the drying chamber 1 rises, and the waste heat absorption chamber 2 is heated. The waste heat absorption chamber 2 and the purge pipe 3 are connected by a connecting pipe, and the hot air in the preheating absorption chamber 2 is blown into the purge pipe 3 by a fan inside the waste heat absorption chamber 2.

[0033] Furthermore, the scraper 32 is an arc-shaped elastic plastic component. During the conveying process of the steel belt, the steel belt passes between the scraper 32 and the bottom surface of the drying chamber 1. At this time, the steel belt is swept by the blower pipe 3, which blows off the surface-dried impurities. Since the space between the scraper 32 and the bottom surface of the drying chamber 1 can only accommodate the steel belt, the scraper 32 has a partial scraping effect on the crushed impurities. At the same time, the airflow in the blower pipe 3 is heated by the residual heat in the drying chamber 1, making the airflow temperature in the blower pipe 3 higher than the outside air but lower than the temperature inside the drying chamber 1. This provides a stepped cooling effect on the steel belt, forming a cooling transition section that can reduce the problem of thermal stress concentration and thus reduce the probability of crack formation.

[0034] In the aforementioned technology, during the conveying of the steel strip, the strip is swept by the blowpipe 3, which blows off surface-dried impurities. For impurities that are crushed, the scraper 32 provides partial scraping. Simultaneously, the airflow temperature inside the blowpipe 3 is higher than the outside air temperature but lower than the temperature inside the drying chamber 1, resulting in a stepped cooling effect on the steel strip. This creates a cooling transition section that reduces thermal stress concentration, thereby lowering the probability of crack formation.

[0035] As a further embodiment of this utility model, a baffle 34 for blocking the purge pipe 3 is fixedly provided on the scraper 32, and an elastic member 33 for maintaining a predetermined angle is provided on the scraper 32.

[0036] Specifically, the purge pipe 3 has an arc-shaped air outlet 31 for blowing air towards the steel strip, and the two ends of the elastic element 33 are fixedly connected to the scraper 32 and the purge pipe 3, respectively. Figure 3 As shown. When the steel strip surface is relatively clean, it can pass just below the scraper 32 without abutting against it. At this time, the baffle 34 is at the outlet of the blowpipe 3 and blocks the arc-shaped air outlet 31. By blocking the arc-shaped air outlet 31 with the baffle 34, the blowpipe 3 continuously heats the bottom surface of the output end of the drying chamber 1, preventing the temperature of the output end of the drying chamber 1 from rising due to heat accumulation. However, when there are dried impurities on the steel strip surface, the steel strip surface is uneven. During the process of passing through the scraper 32, it will abut against the scraper 32, causing the scraper 32 to deflect counterclockwise and causing the baffle 34 to no longer block the arc-shaped air outlet 31, allowing hot air to reach the steel strip.

[0037] As another embodiment of this utility model, the mounting plate 4 is provided with a slide rail 41 for adjusting the height of the scraper 32.

[0038] Specifically, an electric telescopic rod or a hydraulic rod can be installed on the slide rail 41, so that the output end of the electric telescopic rod or hydraulic rod is fixedly connected to the purge pipe 3. The length of the extension of the output end can be adjusted by remote control, thereby driving the purge pipe 3 to move up and down along the slide rail 41 to adjust the distance between the scraper 32 and the bottom surface of the drying box 1, so as to adapt to steel belts of different thicknesses.

[0039] As another embodiment of this utility model, it further includes a support rod 36 slidably disposed on the slide rail 41, and the purge pipe 3 is rotatably disposed on the support rod 36 and maintains a predetermined angle with the support rod 36.

[0040] Specifically, the purge pipe 3 and the support rod 36 are fixedly connected to both ends of the tension spring. The elastic force of the tension spring pulls the purge pipe 3 to maintain a fixed angle. When the steel strip is uneven due to impurities, it will cause the scraper 32 to deflect as it passes through the output end of the drying chamber 1. Simultaneously, the elastic element 33 is compressed and begins to store force. When the elastic element 33 is compressed to its maximum, the steel strip will drive the purge pipe 3 to deflect through the scraper 32. The tension spring on the purge pipe 3 provides a margin of movement for the rotation of the purge pipe 3, such as... Figure 3 As shown, at this time, the purge pipe 3 will deflect counterclockwise and drive the scraper 32 to further abut against the steel strip, so that the scraper 32 generates a greater scraping force on the steel strip when the elastic element 33 stores force.

[0041] As another embodiment of this utility model, the mounting plate 4 is provided with a limiting groove 42 for the purge pipe 3 to slide.

[0042] Specifically, when the steel belt deflects the purge pipe 3 via the scraper 32, such as Figure 3 As shown, the purge pipe 3 will deflect counterclockwise at this time, causing the scraper 32 to further abut against the steel strip. Since the scraper 32 is arc-shaped, after rotating to a certain angle, the two ends of the scraper 32 are perpendicular to the steel strip. At this time, the scraper 32 has an upward supporting force on the purge pipe 3, so that the arc-shaped air outlet 31 of the purge pipe 3 after deflection faces the upper surface of the steel strip. The structure of the arc-shaped air outlet 31 guides the airflow to rise upward when it is blown out, thus achieving a better purging effect.

[0043] As another embodiment provided in this utility model, a guide plate 43 for guiding the purge pipe 3 into the limiting groove 42 is fixedly provided inside the limiting groove 42.

[0044] Specifically, a stop 35 is fixedly installed on the purge pipe 3 to engage with the guide plate 43. The stop 35 is located on the pivot of the purge pipe 3 about the support rod 36. Furthermore, the angle between the stop 35 and the limiting groove 42 is 15°-20°, and both the limiting groove 42 and the slide rail 41 are arranged vertically. Figure 3 As shown, the angle between the stop 35 and the slide rail 41 is 15°-20°. During the deflection of the purge pipe 3, the stop 35 is deflected, and the stop 35 slides along the side of the guide plate 43 until the deflection angle reaches 20°. Then the stop 35 enters the limiting groove 42. At this time, the stop 35 is parallel to the limiting groove 42, so that the stop 35 can slide along the limiting groove 42, thereby allowing the purge pipe 3 to slide upward.

[0045] Furthermore, the baffle 35 causes the purge pipe 3 to rotate before moving upward. During this rotation, the elastic element 33 is compressed and begins to store force, resulting in a greater scraping force exerted by the scraper 32 on the steel strip when the elastic element 33 is storing force. This also prevents the baffle 34 from blocking the arc-shaped air outlet 31, allowing hot air to reach the steel strip. Subsequently, the purge pipe 3 is pushed upward by the scraper 32, and the arc-shaped air outlet 31 delivers air to the surface of the steel strip. The structure of the arc-shaped air outlet 31 guides the airflow upward as it is blown out, thus achieving a better purging effect.

[0046] The foregoing description only illustrates certain exemplary embodiments of the present invention. Undoubtedly, those skilled in the art can modify the described embodiments in various ways without departing from the spirit and scope of the present invention. Therefore, the above drawings and descriptions are illustrative in nature and should not be construed as limiting the scope of protection of the claims of the present invention.

Claims

1. A pretreatment device for steel strip before galvanizing, comprising a drying oven (1) and a steel strip conveyed along its length within it, characterized in that, Includes a waste heat absorption chamber (2) installed on the drying oven (1), which is equipped with a fan; The purge pipe (3) located at the output end of the drying oven (1) is connected to the waste heat absorption chamber (2); A scraper (32) is rotatably mounted on the purge pipe (3) and maintains a predetermined distance from the bottom surface of the drying box (1), and the predetermined distance is consistent with the thickness of the steel strip; Mounting plates (4) are fixedly installed on both sides of the drying chamber (1) to support the purge pipe (3).

2. The steel strip pretreatment device before galvanizing according to claim 1, characterized in that, The scraper (32) is fixedly provided with a baffle (34) for blocking the purge pipe (3), and the scraper (32) is provided with an elastic element (33) for maintaining a predetermined angle.

3. The steel strip pretreatment device before galvanizing according to claim 1, characterized in that, The purge pipe (3) is provided with an arc-shaped air outlet (31) for blowing towards the steel strip.

4. The steel strip pretreatment device before galvanizing according to claim 1, characterized in that, The mounting plate (4) is provided with a slide rail (41) for adjusting the height of the scraper (32).

5. The steel strip pretreatment device before galvanizing according to claim 4, characterized in that, It also includes a support rod (36) that is slidably mounted on the slide rail (41), and a purge pipe (3) that is rotatably mounted on the support rod (36) and maintains a predetermined angle with the support rod (36).

6. The steel strip pretreatment device according to claim 1, characterized in that, The mounting plate (4) is provided with a limiting groove (42) for the purge pipe (3) to slide.

7. The steel strip pretreatment device according to claim 6, characterized in that, A guide plate (43) for guiding the purge pipe (3) into the limiting groove (42) is fixedly installed inside the limiting groove (42).

8. The steel strip pretreatment device before galvanizing according to claim 7, characterized in that, The purge pipe (3) is fixedly provided with a stop (35) that cooperates with the guide plate (43).

9. The steel strip pretreatment device before galvanizing according to claim 8, characterized in that, The included angle between the stop (35) and the limiting groove (42) is 15°-20°.

10. The steel strip pretreatment device according to claim 5, characterized in that, A tension spring is provided between the purge pipe (3) and the support rod (36).

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