Strip steel coating unit

Abstract

The utility model relates to a strip steel coating and plating unit which comprises an uncoiler, a front cleaning unit, a heat treatment unit, a coating and plating unit and a coiler which are sequentially connected and arranged, and a rear cleaning unit is further arranged between the heat treatment unit and the coating and plating unit. The post-cleaning unit comprises one or a plurality of post-cleaning tanks which are arranged in series along the running direction of the strip steel, a plurality of groups of spray-washing units and at least one group of scrubbing units are arranged in the post-cleaning tanks, the plurality of groups of spray-washing units are sequentially distributed along the running direction of the strip steel to form a spray-washing area, and each scrubbing unit is distributed in the spray-washing area. According to the coating unit provided by the utility model, the post-cleaning unit is arranged between the heat treatment unit and the coating unit, and the spray-washing unit and the scrubbing unit are coupled in the post-cleaning tank, so that the cleaning effect on the strip steel can be ensured by adopting a manner of combining spray-washing and scrubbing, and oxide particles generated on the surface of the strip steel in the heat treatment process can be reliably removed; and the device has the advantages of efficient cleaning and low cost.

Description

Technical Field

[0001] The utility model belongs to the technical field of metallurgical production, and particularly relates to a strip steel coating unit. Background Art

[0002] In recent years, there has been a strong demand for products such as automotive plates, home appliance plates, and silicon steel. These products basically need to be galvanized / coated, which is generally achieved through a coating unit. In the coating unit, the strip is generally cleaned and heat-treated before being coated. Oxide particles are generated during the heat treatment. Although these oxide particles are relatively small, they have a greater impact on the quality of the coating. Chinese patent ZL202221612438.1 discloses a continuous hot-dip galvanized strip production line, in which an oxide layer etching and cleaning section is used to treat the strip after the heat treatment furnace and before galvanizing. One or more process combinations including but not limited to magnetron ion cleaning, reverse magnetron ion cleaning, anode layer ion cleaning, arc glow discharge ion cleaning and other plasma etching are used; this method is more effective for treating the oxide layer on the surface of the strip, but it is less efficient and more costly when used to treat oxide particles. Utility Model Content

[0003] The utility model relates to a strip steel coating machine unit, which can at least solve some defects of the prior art.

[0004] The utility model relates to a strip coating unit, comprising a uncoiler, a front cleaning unit, a heat treatment unit, a coating unit and a coiler which are arranged in sequence; a post-cleaning unit is further arranged between the heat treatment unit and the coating unit; the post-cleaning unit comprises one or a plurality of post-cleaning tanks which are arranged in series along the running direction of the strip; a plurality of groups of spraying units and at least one group of brushing units are arranged in the post-cleaning tanks; the plurality of groups of spraying units are distributed in sequence along the running direction of the strip to form a spraying area, and the brushing units are distributed in the spraying area.

[0005] In one embodiment, when the post-cleaning unit includes a plurality of post-cleaning tanks, every two adjacent post-cleaning tanks are sealed and connected via a transition structure.

[0006] In one embodiment, the transition structure includes a transition duct, which is a box-type structure and has steel passage openings for the strip steel to pass through at the left and right ends of the duct, and end connection seats are provided at both ends of the rear cleaning tank, respectively. The ends of the duct are detachably connected to the end connection seats on the corresponding side.

[0007] In one embodiment, the end connecting seat is a box-type structure, and a first notch is provided on the top plate of the connecting seat and a second notch is provided on the end wall of the connecting seat. The first notch is connected to the second notch to form a slot, and the end of the conduit is inserted into the slot on the corresponding side and the top is mounted on the top plate of the connecting seat and the bottom is placed on the bottom of the second notch.

[0008] In one embodiment, the front cleaning unit includes a plurality of front cleaning tanks arranged in series along the running direction of the strip steel, and each two adjacent front cleaning tanks are sealed and connected by a transition structure.

[0009] In one embodiment, the spray washing area includes a plurality of spray washing sections arranged in sequence along the running direction of the strip steel, each spray washing section is provided with a spray washing unit, and each spray washing section is respectively equipped with a water supply source for supplying water to its own spray washing unit.

[0010] In one embodiment, the water source configured for the tail spray section is a new water source, and the water sources configured for the remaining spray sections are all water storage tanks. A return water mechanism is provided at the bottom of each spray section, and the return water mechanism of the rear spray section is connected to the water storage tank of the previous spray section.

[0011] In one embodiment, a squeeze roller is further arranged in the post-cleaning tank, and the squeeze roller is arranged adjacent to the strip outlet of the post-cleaning tank.

[0012] In one embodiment, the heat treatment unit includes an annealing furnace.

[0013] In one embodiment, a looping device is provided between the uncoiler and the pre-cleaning unit and between the coating unit and the coiler.

[0014] The utility model has at least the following beneficial effects:

[0015] The coating unit provided by the utility model arranges a post-cleaning unit between the heat treatment unit and the coating unit, and couples a spraying unit and a brushing unit in the post-cleaning tank. The combination of spraying and brushing can ensure the cleaning effect of the strip steel, can reliably remove the oxide particles generated on the surface of the strip steel during the heat treatment process, improves the subsequent strip steel coating quality, and has the advantages of efficient cleaning and low cost. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the following briefly introduces the drawings required for use in the embodiments or the description of the prior art. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative work.

[0017] Figure 1 A schematic structural diagram of a strip steel coating unit provided in an embodiment of the present utility model;

[0018] Figure 2 A schematic diagram of the structure of a cleaning tank provided in an embodiment of the present utility model;

[0019] Figure 3 Schematic diagram of the nozzle installation structure;

[0020] Figure 4 Schematic diagram of the arrangement of the spray washing unit and the brush washing unit;

[0021] Figure 5 It is a structural diagram of the scrubbing unit;

[0022] Figure 6 A schematic diagram of the installation structure of the transition duct provided in an embodiment of the present utility model;

[0023] Figure 7 Schematic diagram of the structure of the transition duct. DETAILED DESCRIPTION

[0024] The following is a clear and complete description of the technical solutions in the embodiments of the present invention. Obviously, the embodiments described are only part of the embodiments of the present invention, not all of them. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of the present invention.

[0025] Example 1

[0026] like Figure 1 An embodiment of the utility model provides a strip coating unit, comprising a decoiler 1, a front cleaning unit 3, a heat treatment unit 4, a coating unit 6 and a coiler 7 which are arranged in sequence. A post-cleaning unit 5 is also arranged between the heat treatment unit 4 and the coating unit 6. The post-cleaning unit 5 comprises one or multiple post-cleaning tanks arranged in series along the running direction of the strip. Multiple groups of spray units and at least one group of brush washing units are arranged in the post-cleaning tanks. The multiple groups of spray washing units are distributed in sequence along the running direction of the strip to form a spray washing area, and each of the brush washing units is distributed in the spray washing area.

[0027] Preferably, the heat treatment unit 4 includes an annealing heat treatment process, that is, the heat treatment unit 4 includes an annealing furnace. During the annealing process, oxide particles are easily generated on the surface of the steel strip. In this embodiment, by arranging the post-cleaning unit 5 between the heat treatment unit 4 and the coating unit 6, and coupling the spray cleaning unit and the brush cleaning unit in the post-cleaning tank, the combined spraying and brushing methods can ensure effective cleaning of the steel strip, reliably remove oxide particles generated on the steel strip surface during the heat treatment process, and improve the quality of subsequent steel strip coating, thereby achieving the advantages of efficient cleaning and low cost.

[0028] Alternatively, as Figure 1 A looper device 2 is provided between the uncoiler 1 and the pre-cleaning unit 3, and between the coating unit 6 and the coiler 7. The looper device 2 can buffer a certain amount of strip steel, effectively coordinate the production rhythm of the unit, and ensure the smooth operation of the coating unit.

[0029] When the post-cleaning unit 5 utilizes multiple post-cleaning tanks arranged in series, multi-stage cleaning can ensure effective strip cleaning, allowing the strip to be coated with high surface quality. In one embodiment, when the post-cleaning unit 5 includes multiple post-cleaning tanks, each adjacent post-cleaning tank is sealed with a transition structure to prevent airborne dust from contaminating the strip and residual liquid on the strip surface from dripping onto the exterior of the tank.

[0030] In one embodiment, the pre-cleaning unit 3 comprises multiple pre-cleaning tanks arranged in series along the strip's travel direction. This arrangement ensures surface cleanliness of the strip through multi-stage cleaning, facilitating subsequent heat treatment and coating. Similarly, each adjacent pre-cleaning tank is sealed by a transition structure, preventing airborne dust from contaminating the strip and residual liquid from dripping onto the exterior of the tank. The pre-cleaning tanks can be either alkaline or pickling tanks.

[0031] Example 2

[0032] The embodiment of the present invention provides a cleaning tank 101, which can be used in the above-mentioned embodiment 1 as a rear cleaning tank therein, and can also be used as a front cleaning tank therein.

[0033] like Figure 2-Figure 5 The cleaning tank 101 is provided with a strip steel inlet and a strip steel outlet, and a strip steel running channel is defined between the strip steel inlet and the strip steel outlet. Multiple groups of spray washing units 102 and at least one group of brush washing units 103 are arranged in the cleaning tank 101. The multiple groups of spray washing units 102 are distributed in sequence along the running direction of the strip steel to form a spray washing area, and each of the brush washing units 103 is distributed in the spray washing area.

[0034] Furthermore, the spraying unit 102 includes a nozzle 1020 arranged above and / or below the strip running channel, and the brushing unit 103 includes a brush roller 1031 and a support roller 1032 respectively arranged on the upper and lower sides of the strip running channel, and the brush roller 1031 and / or the support roller 1032 are equipped with a roller lifting drive mechanism.

[0035] The cleaning tank 101 preferably adopts a closed tank structure, including but not limited to forming the closed tank structure by covering the tank body with a tank cover.

[0036] The strip steel inlet and the strip steel outlet are generally arranged at the same height, and the strip steel passes through the cleaning tank 101 in a roughly horizontal state.

[0037] The above-mentioned nozzle 1020 is used to spray cleaning liquid. The axial direction of the nozzle 1020 is parallel to the width direction of the strip running channel. A plurality of nozzles are arranged on the nozzle 1020. The nozzles are arranged in sequence along the axial direction of the nozzle 1020. The number of nozzles and the spraying range ensure that the spraying range of the nozzle 1020 can cover the width range of the strip.

[0038] In one embodiment, Figure 2 and Figure 4 At least some of the nozzles 1020 are first nozzles 1021, and the spray area of ​​the first nozzle 1021 intersects with the roller surface of one of the brush rollers 1031. When there are multiple brush rollers 1031, each brush roller 1031 is configured with at least one first nozzle 1021. Because the spray area of ​​the first nozzle 1021 intersects with the roller surface of the brush roller 1031, the roller surface of the brush roller 1031 (particularly the bristles on the roller surface) can be cleaned, thereby improving the operating reliability of the brushing unit 103 and reducing secondary damage to the steel strip caused by particles on the roller surface of the brush roller 1031. In particular, when the intersection is close to the contact point between the brush roller 1031 and the steel strip (generally the bottom / top end of the brush roller 1031), impurities such as oxide particles removed by the brush can be promptly washed away, improving the cleanliness of the steel strip.

[0039] More preferably, Figure 4 In addition to intersecting with the roller surface of the corresponding brush roller 1031, the spraying area of ​​the first nozzle 1021 also intersects with the strip running channel adjacent to the roller surface of the brush roller 1031, that is, the first nozzle 1021 sprays toward the triangular area formed by the intersection of the brush roller 1031 and the strip. This method can not only make the cleaning liquid directly spray the roller surface of the brush roller 1031 and the strip surface, but also improve the cleanliness of the strip. In particular, the cleaning liquid can infiltrate the contact area between the brush roller 1031 and the strip to form wet brushing. While brushing and spraying, the washed-off particles and other debris can be separated from the brush roller 1031 and the strip in time to avoid these debris grinding the strip and the bristles of the brush roller 1031. It can not only improve the brushing effect, but also better protect the strip surface and reduce the wear of the bristles.

[0040] Alternatively, as Figure 2 and Figure 4 The first nozzle 1021 is arranged on the strip steel inlet side and the strip steel outlet side of each brushing unit 103, which can further improve the brushing effect and thus improve the cleanliness of the strip steel.

[0041] In one embodiment, Figure 2 and Figure 4 Among the nozzles 1020, some are second nozzles 1022. The spray area of ​​the second nozzle 1022 intersects with the surface of one of the support rollers 1032. Since the spray area of ​​the second nozzle 1022 intersects with the surface of the support roller 1032, the surface of the support roller 1032 can be cleaned, thereby reducing secondary damage to the strip caused by particles on the surface of the support roller 1032. When there are multiple support rollers 1032, each support roller 1032 is equipped with at least one second nozzle 1022.

[0042] Further preferably, the spraying area of ​​the second nozzle 1022 not only intersects with the corresponding support roller 1032 surface, but also intersects with the strip running channel adjacent to the support roller 1032 surface. That is, the second nozzle 1022 sprays toward the triangular area formed by the intersection of the support roller 1032 and the strip. This approach not only allows the cleaning liquid to be sprayed directly onto the support roller 1032 surface and the strip surface, improving the cleanliness of the strip, but also allows the cleaning liquid to soak into the contact area between the support roller 1032 and the strip, effectively protecting the strip surface and reducing wear on the support roller 1032.

[0043] Alternatively, as Figure 2 and Figure 4 The second nozzle 1022 is arranged at the strip inlet side of the brushing unit 103.

[0044] Optionally, when the second nozzle 1022 and the first nozzle 1021 are arranged on the same side of the brushing unit 103 (strip steel inlet side / strip steel outlet side), the second nozzle 1022 is arranged vertically opposite to the first nozzle 1021 on the same side.

[0045] In one embodiment, Figure 2 and Figure 4 Among the nozzles 1020, some of the nozzles 1020 are third nozzles 1023. All spraying areas of the third nozzles 1023 intersect with the strip running channel. The third nozzles 1023 are used to spray and wash the strip.

[0046] Preferably, there are multiple third nozzles 1023, and each third nozzle 1023 is arranged in pairs to spray the upper and lower surfaces of the strip, that is, each third nozzle 1023 is arranged to form at least one group of spray modules, and each group of spray modules includes two third nozzles 1023 arranged relatively on the upper and lower sides of the strip running channel.

[0047] Preferably, at least one set of spray modules is arranged downstream of the final brushing unit 103 to ensure the cleanliness of the strip at the strip outlet.

[0048] In one embodiment, the spray washing area includes a plurality of spray washing sections arranged in sequence along the running direction of the strip steel, each spray washing section is provided with a spray washing unit 102, and each spray washing section is respectively equipped with a water supply source for supplying water to its own spray washing unit 102.

[0049] Further preferably, the water source configured for the tail spray section is a new water source, and the water sources configured for the remaining spray sections are all water storage tanks. A return water mechanism is provided at the bottom of each spray section, and the return water mechanism of the latter spray section is connected to the water storage tank of the previous spray section.

[0050] Among them, preferably, desalted water is used as the cleaning liquid, the above-mentioned new water supply source is used to supply high-cleanliness desalted water, and the return water of the rear spraying section is used as the feed water of the front spraying section. Therefore, the cleanliness of the cleaning liquid in the tail spraying section is the highest, and then the cleanliness of the cleaning liquid in each forward spraying section gradually decreases. In this way, the cleanliness of the feed water near the strip outlet side can be ensured to be greater than the cleanliness of the feed water near the strip inlet side, which is beneficial to improving the cleanliness of the strip at the strip outlet. In addition, the step-by-step recycling of feed water and return water is also realized, which can reduce water consumption, save energy and increase efficiency.

[0051] Preferably, the bottom trough of each spraying section adopts a V-shaped bottom to facilitate return water collection. The return water mechanism generally includes a return water pipe 1011, which is connected to the V-shaped bottom of the corresponding spraying section. In addition, the bottom troughs of adjacent spraying sections are separated by partitions 1012. This prevents crosstalk between return water from different spraying sections and facilitates the step-by-step recycling of feed and return water.

[0052] Figure 3The mounting structure of the nozzle 1020 is shown. In one embodiment, at least some of the nozzles 1020 are adjustable, including at least one of rotation about their own axis, vertical position adjustment, and horizontal position adjustment. Rotation of the nozzle 1020 about its own axis allows adjustment of the nozzle's spray angle. Vertical and horizontal position adjustment of the nozzle 1020 allows adjustment of the intersection of the spray area with the strip running channel, the surface of the brush roller 1031, or the surface of the support roller 1032, to achieve better cleaning effects and efficiency. In particular, a combination of two or three of the aforementioned adjustment methods provides greater adjustment flexibility for the nozzle 1020, resulting in greater flexibility and reliability in the cleaning operation.

[0053] In one embodiment, at least some of the nozzles of each nozzle 1020 are adjustable nozzles, including at least one adjustment method of adjustable spray angle, adjustable flow, and adjustable spray shape. When a combination of two or three of the above adjustment methods is adopted, the adjustment flexibility of the nozzle is higher, and the flexibility and reliability of the cleaning operation are also higher.

[0054] Among them, one or more groups of brushing units 103 can be selected according to the size and density of the incoming strip steel particles and the requirements for the cleanliness of the substrate strip steel in subsequent processing. Based on the structure in which the brush roller 1031 and / or the support roller 1032 are equipped with a roller lifting drive mechanism, multiple groups of brushing units 103 can be set up. When in use, one or more groups of brushing units 103 can be selected according to the actual working conditions.

[0055] Among them, according to actual requirements (such as the requirements for the cleanliness of both sides of the substrate strip in subsequent processing), the brush roller 1031 can be designed to be below the strip running channel, or the brush roller 1031 can be designed to be above the strip running channel, or some brush rollers 1031 can be designed to be above the strip running channel and some brush rollers 1031 can be designed to be below the strip running channel, for example, multiple groups of brush rollers 1031 are alternately arranged on the upper and lower sides of the strip running channel.

[0056] The lifting drive mechanism can be driven by a cylinder / hydraulic cylinder, a motor+screw mechanism, etc. The specific connection structure is not described here. Figure 5 The lifting drive mechanism is arranged outside the cleaning tank 101, which can not only improve the structural sealing of the cleaning tank 101, but also improve the operating reliability of the lifting drive mechanism and extend its service life. Accordingly, both ends of the brush roller 1031 / support roller 1032 need to pass through the cleaning tank 101 and then be connected to the lifting drive mechanism.

[0057] Further preferably, a roller sealing door 105 is provided at the junction between the roller and the cleaning tank 101 , which can further improve the structural sealing of the cleaning tank 101 .

[0058] Further preferably, the roller shoulders of the brush roller 1031 / support roller 1032 that pass through the cleaning tank 101 are each provided with a water retaining ring. The diameter of the water retaining ring is larger than the diameter of the roller penetration hole in the cleaning tank 101, thereby improving the structural sealing of the cleaning tank 101 and reducing the possibility of cleaning liquid splashing outward. In particular, the water retaining ring cooperates with the roller sealing door 105 to further enhance the sealing effect. In particular, two water retaining rings are coaxially provided on each roller shoulder. The two water retaining rings are respectively provided inside and outside the door frame of the roller sealing door 105, creating a labyrinth seal effect and improving the sealing performance.

[0059] In one embodiment, Figure 2 and Figure 4 A squeezing roller 104 is also arranged in the cleaning tank 101. The squeezing roller 104 is arranged adjacent to the strip outlet. The squeezing roller 104 is used to squeeze out residual moisture on the strip surface to provide high-cleanliness strip for subsequent processes.

[0060] Further preferably, both ends of the squeezing roller 104 pass through the cleaning tank 101 and are then connected to relevant power equipment (including transmission equipment, roller gap height adjustment mechanism, etc.), and accordingly, a roller sealing door 105 is set at the roller, and a water retaining ring is set on the roller shoulder of the squeezing roller 104 passing through the cleaning tank 101. For details, please refer to the relevant structure of the above-mentioned brush roller 1031 / support roller 1032, which will not be repeated here.

[0061] Example 3

[0062] The embodiment of the present invention provides a transition duct 200, which can be used in the above-mentioned embodiment 1 as a transition structure, connected to the rear cleaning tank / front cleaning tank, and for the convenience of description, collectively referred to as the cleaning tank 101 below.

[0063] The transition duct 200 is preferably detachably connected to the cleaning tank 101 , so that the transition duct 200 can be easily disassembled and assembled.

[0064] like Figure 2 、 Figure 6 and Figure 7 The transition duct 200 is a box-type structure and the left and right ends of the duct are respectively provided with steel openings for the strip steel to pass through. The two ends of the cleaning tank 101 are respectively provided with end connecting seats 1013, and the ends of the duct are detachably connected to the end connecting seats 1013 on the corresponding side.

[0065] In one embodiment, the end connection seat 1013 is a box-type structure, and a first notch is provided on the connection seat top plate 10131 and a second notch is provided on the connection seat end wall 10133. The first notch is connected to the second notch to form a slot, and the end of the conduit is inserted into the slot on the corresponding side and the top is mounted on the connection seat top plate 10131 and the bottom is placed on the bottom of the second notch.

[0066] The above-mentioned transition duct 200 is connected by a duct top plate 201, a duct bottom plate 202 and two duct end plates to form a box-type structure, and steel openings are formed on the two duct end plates; in some embodiments, the two duct ends of the transition duct 200 can also be open, that is, the above-mentioned two duct end plates are eliminated.

[0067] Optionally, a handle is provided on the duct top plate 201 to facilitate the assembly and disassembly of the transition duct 200 .

[0068] Preferably, the clearance between the end of the duct and the slot wall on the corresponding side is matched, which can improve the connection sealing between the transition duct 200 and the end connecting seat 1013, and facilitate the disassembly and assembly of the transition duct 200. For example, the slot width of the first slot and the slot width of the second slot can be made the same as the length of the transition duct 200 (this length direction is parallel to the width direction of the strip) or slightly larger than the length of the transition duct 200.

[0069] In one embodiment, Figure 6 and Figure 7 Mounting plates 2011 extend horizontally outward from both ends of the duct top plate 201. First restraining plates 2012 extend downward from the ends of the mounting plates 2011. A support plate 10134 protrudes upward from the connector top plate 10131. The middle portion of the mounting plate 2011 rests on the corresponding support plate 10134. As a result, the first restraining plate 2012 is located between the support plate 10134 and the adjacent cleaning tank 101, that is, on the side of the support plate 10134 away from the duct top plate 201. This structure not only ensures the structural safety of the transition duct 200 through the interference and restraint effect between the first restraining plate 2012 and the support plate 10134, but also creates a labyrinth seal at the connection between the transition duct 200 and the upper side of the end connector 1013, effectively improving the sealing performance of the connection between the transition duct 200 and the end connector 1013. Furthermore, when the bottom end of the first restraining plate 2012 abuts against the top plate 10131 of the connecting seat on the corresponding side, the above-mentioned sealing effect is better.

[0070] In one embodiment, Figure 6 and Figure 7Second constraint plates 2021 are formed downwardly protruding from both ends of the duct base plate 202. These second constraint plates 2021 are located within the inner cavity of the end connector 1013, that is, on the side of the connector end wall 10133 away from the duct base plate 202. This structure not only ensures the structural safety of the transition duct 200 through the interference constraint effect between the second constraint plates 2021 and the connector end wall 10133, but also creates a labyrinth seal at the connection between the transition duct 200 and the underside of the end connector 1013, effectively improving the sealing performance of the connection between the transition duct 200 and the end connector 1013.

[0071] In one embodiment, Figure 6 and Figure 7 The connection seat bottom plate 10132 of the end connection seat 1013 is tilted and its top end is connected to the connection seat end wall 10133. Based on this structure, it is easy to collect the cleaning liquid in the end connection seat 1013. In particular, when the inner cavity of the end connection seat 1013 is connected to the cleaning tank 101, the cleaning liquid collected in the end connection seat 1013 can be returned to the cleaning tank 101, which is beneficial to the recycling of the cleaning liquid and prevents the cleaning liquid in the end connection seat 1013 from being unable to be discharged and contaminating the strip steel again. Therefore, a drainage pipe 1014 can be provided at each end of the cleaning tank 101. The inlet end of the drainage pipe 1014 is connected to the inner cavity of the end connection seat 1013 and is arranged near the conduit bottom plate 202. The outlet end of the drainage pipe 1014 is located in the cleaning tank 101 and faces the bottom of the cleaning tank 101. In this way, the cleaning liquid collected in the end connection seat 1013 can be returned to the cleaning tank 101.

[0072] In one embodiment, Figure 6 and Figure 7 Two sets of guide slopes 2022 are provided on the upper surface of the duct bottom plate 202. The two sets of guide slopes 2022 slope from the middle of the duct bottom plate 202 to the two ends of the duct bottom plate 202 respectively. Based on this structure, the cleaning liquid dripping into the transition duct 200 through the surface of the strip can flow to the end connecting seat 1013, which is convenient for the recovery of the cleaning liquid.

[0073] In one embodiment, Figure 6 The strip steel inlet and strip steel outlet of the cleaning tank 101 are both provided with sealing units 1015, which can improve the structural sealing of the cleaning tank 101. The sealing unit 1015 includes but is not limited to the use of soft sealing strips, etc., which are respectively in contact / gap-matched with the upper and lower surfaces of the strip steel through the soft sealing strips, while achieving a sealing effect, it is also beneficial to remove the residual cleaning liquid on the surface of the strip steel.

[0074] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principles of the present invention should be included in the scope of protection of the present invention.

Claims

1. A strip coating unit, comprising an uncoiler, a pre-cleaning unit, a heat treatment unit, a coating unit, and a coiler, which are arranged in sequence, characterized in that: A post-cleaning unit is also arranged between the heat treatment unit and the coating unit. The post-cleaning unit includes one or multiple post-cleaning tanks arranged in series along the running direction of the strip. Multiple groups of spray units and at least one group of brush units are arranged in the post-cleaning tank. The multiple groups of spray units are distributed in sequence along the running direction of the strip to form a spray area, and each of the brush units is distributed in the spray area.

2. The strip coating unit according to claim 1, characterized in that: When the post-cleaning unit includes a plurality of post-cleaning tanks, every two adjacent post-cleaning tanks are sealed and connected via a transition structure.

3. The strip coating unit according to claim 2, characterized in that: The transition structure includes a transition duct, which is a box-type structure and has steel passage openings for the strip steel to pass through at the left and right ends. The two ends of the rear cleaning tank are respectively provided with end connecting seats, and the ends of the duct are detachably connected to the end connecting seats on the corresponding side.

4. The strip coating unit according to claim 3, characterized in that: The end connecting seat is a box-type structure, and a first notch is provided on the top plate of the connecting seat and a second notch is provided on the end wall of the connecting seat. The first notch is connected to the second notch to form a slot. The end of the conduit is inserted into the slot on the corresponding side and the top is mounted on the top plate of the connecting seat and the bottom is placed on the bottom of the second notch.

5. The strip coating unit according to any one of claims 1 to 4, characterized in that: The front cleaning unit comprises a plurality of front cleaning tanks arranged in series along the running direction of the strip steel, and each two adjacent front cleaning tanks are sealed and connected via a transition structure.

6. The strip coating unit according to claim 1, characterized in that: The spray washing area includes a plurality of spray washing sections arranged in sequence along the running direction of the strip steel, each spray washing section is provided with a spray washing unit, and each spray washing section is respectively equipped with a water supply source for supplying water to its own spray washing unit.

7. The strip coating unit according to claim 6, characterized in that: The water source for the tail spray section is the new water source, and the water sources for the remaining spray sections are all water storage tanks. A return water mechanism is provided at the bottom of each spray section, and the return water mechanism of the rear spray section is connected to the water storage tank of the previous spray section.

8. The strip coating unit according to claim 1, characterized in that: A squeezing roller is further arranged in the post-cleaning tank and is arranged adjacent to the strip steel outlet of the post-cleaning tank.

9. The strip coating unit according to claim 1, characterized in that: The heat treatment unit includes an annealing furnace.

10. The strip coating unit according to claim 1, characterized in that: A looping device is provided between the uncoiler and the front cleaning unit and between the coating unit and the coiler.

Images