Strip steel surface coating removing device

Abstract

The utility model relates to a strip steel surface coating removing device which comprises a heating device, an upper surface coating removing assembly, a lower surface coating removing assembly and a waste collecting device. The upper surface plating layer removing assembly and the lower surface plating layer removing assembly are arranged on the downstream of the heating device, are respectively arranged on the upper side and the lower side of the strip steel, and each of the upper surface plating layer removing assembly and the lower surface plating layer removing assembly comprises at least one desalted water spraying device, at least one steel brush and at least one air knife spraying device; the desalted water spraying device is used for spraying desalted water to the surface of the strip steel; the steel brush can do reciprocating motion to brush and sweep the surface of the strip steel; the air knife jetting device is used for jetting airflow to the surface of the strip steel; the waste collecting device is arranged around the strip steel and used for collecting solid and liquid waste leaving the surface of the strip steel. The device can be used for efficiently removing the plating on the surface of the strip steel.

Description

Technical Field

[0001] The utility model relates to the field of strip steel coating treatment equipment, in particular to a strip steel surface coating removal device. Background Art

[0002] In order to improve the corrosion resistance of steel strip, continuous hot-dip galvanizing is one of the most economical and effective means. According to the different components of the liquid zinc in the zinc pot, the coating products include pure zinc, zinc-aluminum, zinc-aluminum-magnesium coating, etc. In order to adapt to the high-speed development of the unit and improve the control accuracy of the galvanizing layer, when hot-dip galvanizing steel strip, a flat air knife device that continuously sprays out from a slit-shaped nozzle across the entire width of the strip is used to scrape off the excess zinc on the surface of the strip. This method is called air-blowing galvanizing.

[0003] When using the air blowing method for galvanizing, the sinking rollers and air knife devices in the zinc pot need to be regularly maintained and replaced. Or when changing the type of coating, the zinc pot needs to be replaced. At this time, the unit needs to be shut down. In the existing unit process layout, the zinc pot liquid level is about 40m away from the top roller of the cooling tower. During the shutdown process, due to the change in strip speed and the fluctuation of air volume control in the post-galvanizing cooling section, the coating will not be cooled sufficiently, and the coating on the surface of the 40m long strip will easily peel off. In the subsequent production, the peeled strip will partially peel off and partially remain on the strip surface when it runs to the exit coiler.

[0004] If the peeling zinc scale is left unattended, after the machine is restarted, part of the zinc scale of the strip steel will peel off in the subsequent water quenching tank during the downward movement. At this time, the zinc scale is likely to cause the desalted water circulation system in the water quenching tank to malfunction, affecting the production of the unit. Since it is impossible to predict where the zinc scale will peel off during operation, part of the zinc scale may adhere to the surface of various rotating rollers, affecting the surface quality of the subsequent strip coating.

[0005] Therefore, it is advisable to peel off the zinc scale before the strip passes through the tower top roller. The common method is to add a bunch of rotating brush rollers to rub the upper and lower surfaces of the strip to remove the peeling zinc scale. This operation is easy to generate a lot of dust and cause pollution, and the rollers are worn out and need to be replaced, and the roller replacement operation is cumbersome and complicated.

[0006] Therefore, it is necessary to develop a simple and efficient zinc scale removal device to improve product quality and improve unit production stability. Utility Model Content

[0007] In view of the above problems, the utility model proposes a more optimized device for removing coating on the surface of strip steel.

[0008] The utility model is implemented by the following technical solutions:

[0009] The utility model proposes a device for removing coating on the surface of steel strip, which is arranged on the conveying path of the steel strip and is used for removing coating on the surface of the steel strip. The device comprises a heating device, an upper surface coating removal integration, a lower surface coating removal integration and a waste collection device. The heating device is used for heating the surface of the steel strip. The upper surface coating removal integration and the lower surface coating removal integration are arranged downstream of the heating device and are respectively arranged on the upper and lower sides of the steel strip. The upper surface coating removal integration and the lower surface coating removal integration both comprise at least one desalted water injection device, at least one steel brush and at least one air knife injection device. The desalted water injection device is used for injecting desalted water onto the surface of the steel strip. The steel brush is implemented to be reciprocatingly movable to sweep the surface of the steel strip with a brush. The air knife injection device is used for injecting air flow onto the surface of the steel strip. The waste collection device is arranged around the steel strip and is used for collecting solid and liquid waste leaving the surface of the steel strip.

[0010] Preferably, it also includes a squeezing roller, which is arranged downstream of the upper surface coating removal integration and the lower surface coating removal integration, and is used to squeeze out the desalted water remaining on the surface of the strip.

[0011] Preferably, at least one pair of squeeze rollers is provided, and a pair of squeeze rollers includes two squeeze rollers relatively arranged on the upper and lower sides of the steel strip, and each squeeze roller is equipped with a lifting device.

[0012] Wherein, preferably, the waste collecting device comprises a funnel-shaped structure that contracts downward.

[0013] Among them, preferably, the upper surface coating removal integration and the lower surface coating removal integration are equipped with a lifting device.

[0014] Preferably, the steel brush is movably arranged, and its moving direction is perpendicular to the conveying direction of the steel strip.

[0015] Among them, preferably, the steel brush integrated with the upper surface coating removal and the steel brush integrated with the lower surface coating removal are opposite to each other in upper and lower directions.

[0016] Preferably, the length of the steel brush is greater than the width of the steel strip.

[0017] Wherein, preferably, the spraying angle of the desalted water spraying device and / or the air knife spraying device is adjustable.

[0018] Preferably, the air knife jet device jets the air flow obliquely toward its upstream.

[0019] The utility model has the following beneficial effects: the steel surface coating removal device of the utility model first produces cracks in the coating by rapidly heating the steel strip and spraying the steel strip surface with desalted water to form rapid thermal expansion and contraction, then brushes back and forth with a steel brush to peel off the coating from the steel strip surface, and then sprays out with an air knife to remove the solid and liquid remaining on the surface. The device uses conventional media such as electricity, desalted water and compressed air commonly used in workshops, and quickly switches on and off the device according to the production rhythm. The control is simple, and the device structure is simple and practical. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1 is a schematic diagram of a device for removing coating from a steel strip surface in an embodiment;

[0021] Figure 2 is a schematic diagram of a waste collection device in an embodiment;

[0022] Figure 3 is a schematic diagram of the upper surface coating removal integration in the embodiment;

[0023] Figure 4 Schematic diagram of the lower surface coating removal integration in the embodiment. DETAILED DESCRIPTION

[0024] To further illustrate the various embodiments, the present invention provides drawings. These drawings are part of the disclosure of the present invention, which are mainly used to illustrate the embodiments and can be used in conjunction with the relevant descriptions in the specification to explain the operating principles of the embodiments. With reference to these contents, a person of ordinary skill in the art should be able to understand other possible implementations and advantages of the present invention. The components in the figures are not drawn to scale, and similar component symbols are generally used to represent similar components.

[0025] The utility model is now further described in conjunction with the accompanying drawings and specific implementation methods.

[0026] See also Figure 1-4 As shown, as a preferred embodiment of the utility model, a device for removing the coating on the surface of a steel strip is provided, which is arranged on the conveying path of the steel strip 1 and is used to remove the coating on the surface of the steel strip 1, especially the metal coating. This embodiment is described by taking the steel strip 1 with a zinc coating as an example. In this embodiment, the steel strip 1 is conveyed between the first tower top roller 2 and the second tower top roller 3, and the device for removing the coating on the surface of the steel strip is arranged on the horizontal conveying section of the steel strip 1 between the first tower top roller 2 and the second tower top roller 3.

[0027] The strip surface coating removal device includes a heating device 5, an upper surface coating removal integration 6, a lower surface coating removal integration 7 and a waste collection device 4. The heating device 5 is used to heat the surface of the strip. In this embodiment, the heating device 5 is an electric induction heating device, which adopts transverse magnetic induction heating, and can quickly heat the surface of the strip to between 400°C and 600°C when the strip 1 passes through the heating device 5. According to the specific coating, the heating device 5 can be set to different heating temperatures. The upper surface coating removal integration 6 and the lower surface coating removal integration 7 are arranged downstream of the heating device 5 and are arranged on the upper and lower sides of the strip 1 respectively. In this embodiment, "upstream" and "downstream" are described based on the conveying direction of the strip 1. The upper surface coating removal integration 6 includes a first upper desalted water injection device 62, a first upper steel brush 63, a second upper desalted water injection device 64, a second upper steel brush 65 and an upper air knife injection device 66 arranged in sequence from upstream to downstream. The lower surface coating removal integration 7 includes a first lower desalted water injection device 72, a first lower steel brush 73, a second lower desalted water injection device 74, a second lower steel brush 75 and a lower air knife injection device 66, which are arranged in sequence from upstream to downstream. Among them, the first upper desalted water injection device 62 and the second upper desalted water injection device 64 are used to spray desalted water onto the upper surface of the steel strip 1, and the first lower desalted water injection device 72 and the second lower desalted water injection device 74 are used to spray desalted water onto the lower surface of the steel strip 1. The steel strip 1 heated by the heating device 5 encounters the desalted water injected by the desalted water injection device, and the zinc skin cracks are generated after the thermal expansion and contraction of rapid heating and rapid cooling. The first upper steel brush 63 and the second upper steel brush 65 are implemented to be reciprocating to brush the upper surface of the steel strip 1. The first lower steel brush 73 and the second lower steel brush 75 are implemented to be reciprocating to brush the lower surface of the steel strip 1. By brushing the steel strip 1 with the steel brush, the zinc skin can be peeled off the surface of the steel strip. The upper air knife spray device 66 and the lower air knife spray device 66 spray airflow to the upper and lower surfaces of the strip respectively to remove the zinc powder, zinc scale and liquid remaining on the surface of the strip. By the above arrangement, the zinc scale on the surface of the strip can be effectively removed.

[0028] The desalted water spraying device and the steel brush of the upper surface coating removal integrated 6 can be provided with more numbers, or only one can be provided at least, and the same is true for the lower surface coating removal integrated 7. In the case where more than one desalted water spraying device and steel brush are provided, different numbers of desalted water spraying devices and steel brushes can be selectively opened according to the type and adhesion of the coating to achieve the best removal effect. In addition, the present embodiment adopts a staggered arrangement of the desalted water spraying devices and steel brushes one by one along the conveying direction of the strip 1, and the actions of spraying desalted water and brushing the surface of the strip can be repeated to improve the cleaning effect of the coating.

[0029] The upper surface coating removal integration 6 and the lower surface coating removal integration 7 are integrated into a whole module structure. The upper surface coating removal integration 6 and the lower surface coating removal integration 7 are respectively equipped with lifting devices 61 and 71 to control the upper surface coating removal integration 6 and the lower surface coating removal integration to lift and lower. After the device is started, the lifting controls the upper surface coating removal integration 6 and the lower surface coating removal integration 7 to operate close to the strip steel 1. At the same time, the lifting device can also adjust the distance between the upper surface coating removal integration 6 and the lower surface coating removal integration 7 and the strip steel 1.

[0030] The steel brush refers to a brush used for brushing the strip steel. The material of the steel brush can be flexibly selected according to the different coatings. In this embodiment, the length of each steel brush is increased by 200mm on the basis of the maximum width of the strip steel, and the width of the steel brush is 200-300mm. The steel brush can be a segmented design in which multiple steel brush monomers are arranged horizontally to form the entire steel brush, and each section of the steel brush monomer is fixed and locked separately to facilitate the replacement of the steel brush. The steel brush can be driven by a driving device, such as a cylinder / motor drive. In this embodiment, the steel brush is movably arranged, and its moving direction is perpendicular to the conveying direction of the strip steel 1 to achieve a better brushing effect. The steel brush of the upper surface coating removal integrated 6 and the steel brush of the lower surface coating removal integrated 7 are opposite to each other up and down. For example, the first upper steel brush 63 is opposite to the first lower steel brush 73, and the second upper steel brush 65 is opposite to the second lower steel brush 75. This arrangement allows the steel brushes to clamp the strip steel and further improve the brushing effect.

[0031] The medium sprayed by the air knife spray device can be compressed air, nitrogen, etc. In this embodiment, the air knife spray device sprays the air flow in an inclined direction toward its upstream to avoid blowing waste materials onto the strip steel whose coating has been removed. The spray angle of the desalted water spray device and / or the air knife spray device is adjustable to flexibly select the spray angle according to different actual conditions. A plurality of air knife spray devices can also be provided along the conveying direction of the strip steel 1.

[0032] The strip steel surface coating removal device also includes a waste collection device 4, which is arranged around the strip steel 1 and is used to collect solid and liquid wastes leaving the surface of the strip steel 1. In this embodiment, the waste collection device 4 is implemented as a box structure for the strip steel 1 to pass through, the lower part of the waste collection device 4 is a downwardly contracted funnel-shaped structure, and the lower end of the waste collection device 4 is provided with a flange interface, which is convenient for connecting the pipeline to discharge zinc powder and liquid. The top surface and the operating side of the waste collection device 4 are provided with suitable maintenance ports according to the equipment layout requirements, and a sealing door panel 41 is installed.

[0033] The strip surface coating removal device further includes a pair of squeeze rollers 8 and 9, which are arranged downstream of the upper surface coating removal integration 6 and the lower surface coating removal integration 7, and are used to squeeze out the desalted water remaining on the surface of the strip 1. The squeeze rollers 8 and 9 are arranged on the upper and lower sides of the strip 1 relatively, and each is equipped with a lifting device. In other embodiments, more than one pair of squeeze rollers may also be provided.

[0034] The strip surface coating removal device of this embodiment adopts conventional media such as electricity, desalted water and compressed air commonly used in workshops, and quickly switches the device on and off according to the production rhythm. The control is simple and the device structure is simple and practical.

[0035] Although the present invention has been specifically demonstrated and described in conjunction with the preferred embodiments, those skilled in the art should understand that various changes made to the present invention in form and detail, without departing from the spirit and scope of the present invention as defined in the appended claims, shall fall within the scope of protection of the present invention.

Claims

1. A device for removing coating on the surface of a steel strip, arranged on a conveying path of the steel strip, for removing coating on the surface of the steel strip, characterized in that: It includes a heating device, an upper surface coating removal integration, a lower surface coating removal integration and a waste collection device, wherein the heating device is used to heat the surface of the steel strip, the upper surface coating removal integration and the lower surface coating removal integration are arranged downstream of the heating device and are respectively arranged on the upper and lower sides of the steel strip, the upper surface coating removal integration and the lower surface coating removal integration each include at least one desalted water injection device, at least one steel brush and at least one air knife injection device, the desalted water injection device is used to spray desalted water onto the surface of the steel strip; the steel brush is implemented to be reciprocating to sweep the surface of the steel strip; the air knife injection device is used to spray airflow onto the surface of the steel strip; the waste collection device is arranged around the steel strip, and is used to collect solid and liquid waste leaving the surface of the steel strip.

2. The device for removing coating from the surface of a steel strip according to claim 1, characterized in that: It also includes a squeezing roller, which is arranged downstream of the upper surface coating removal integration and the lower surface coating removal integration and is used to squeeze out the desalted water remaining on the surface of the strip steel.

3. The device for removing coating from the surface of a steel strip according to claim 2, characterized in that: There is at least one pair of squeeze rollers, and the pair of squeeze rollers includes two squeeze rollers arranged relatively on the upper and lower sides of the strip steel, and each squeeze roller is equipped with a lifting device.

4. The device for removing coating from the surface of a steel strip according to claim 1, characterized in that: The waste collecting device comprises a funnel-shaped structure which contracts downwards.

5. The device for removing coating from the surface of a steel strip according to claim 1, characterized in that: The upper surface coating removal integration and the lower surface coating removal integration are equipped with a lifting device.

6. The device for removing coating from the surface of a steel strip according to claim 1, characterized in that: The steel brush is movably arranged, and its moving direction is perpendicular to the conveying direction of the steel strip.

7. The device for removing coating from the surface of a steel strip according to claim 1, characterized in that: The integrated steel brush for removing the upper surface coating and the integrated steel brush for removing the lower surface coating are arranged opposite to each other in upper and lower directions.

8. The device for removing coating from the surface of a steel strip according to claim 1, characterized in that: The length of the steel brush is greater than the width of the steel strip.

9. The device for removing coating from the surface of a steel strip according to claim 1, characterized in that: The spray angle of the desalted water spray device and / or the air knife spray device is adjustable.

10. The device for removing coating from the surface of a steel strip according to claim 1, characterized in that: The air knife jet device jets air flow in an inclined direction toward the upstream thereof.

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