Online coating device and method for embedded cast-rolled composite board

Abstract

The invention discloses an online coating device and method for a pre-buried cast-rolled composite board, and belongs to the technical field of preparation of pre-buried cast-rolled composite boards. An inlet guide mechanism, a surface pretreatment mechanism, an inlet thickness online detection mechanism, a multi-unit graded coating mechanism, an outlet thickness online detection mechanism and an outlet guide mechanism are sequentially arranged in the board conveying direction. By means of the online regulation and control and graded spraying technology, uniform and efficient coating of plates with different widths is achieved, and cyclic utilization of spraying powder is achieved through the powder online recovery system. According to the invention, the online continuous operation of cold spraying and cast rolling is realized, the coating uniformity and the production benefit of the composite board are obviously improved, and the device is suitable for the preparation of large-scale and multi-specification pre-embedded cast-rolled composite boards.

Description

Technical Field

[0001] This invention relates to the field of pre-embedded cast-rolled composite plate preparation technology, and in particular to an online coating device and method for pre-embedded cast-rolled composite plates. Background Technology

[0002] Pre-embedded cast-rolled composite plates are layered composite materials formed through casting and rolling. A flux coating is pre-applied to the surface of the base metal, and then the coating is metallurgically bonded to the base metal using a casting and rolling process. This results in a composite material that combines excellent mechanical properties with brazing capabilities. This type of material has broad application potential in fields with high requirements for structural integrity and functionality, such as aerospace, automotive manufacturing, and air conditioning heat exchangers.

[0003] Currently, the production of such composite panels using spraying technology generally employs a segmented production model of "spraying-transferring-casting and rolling," with the spraying and casting / rolling processes operating independently. This results in a disjointed production flow, slow pace, and severely restricts overall production efficiency. After spraying, the substrate requires hoisting, temporary storage, and secondary loading. The formed coating is susceptible to mechanical damage during this process, introducing quality fluctuations and reliability risks. This offline operation mode not only extends the production cycle and increases work-in-process inventory but also hinders the continuous and automated production process, becoming one of the key bottlenecks restricting the large-scale application of this technology. During the spraying process, some powder particles rebound or escape due to insufficient deposition conditions, forming a large amount of unbound powder. Most existing production systems lack efficient online collection and graded recycling mechanisms, leading to the direct disposal of this functional powder. This not only wastes raw materials and increases production costs but also imposes additional burdens on environmental management and workshop cleaning. Summary of the Invention

[0004] To address the technical challenges of independent spraying and casting / rolling processes and material waste in the production of embedded cast-rolled composite plates, this invention provides an online coating device and method for embedded cast-rolled composite plates. This method enables continuous and coordinated online production of spraying and casting / rolling, while simultaneously allowing for the recycling and reuse of spraying powder, thereby reducing production costs.

[0005] The technical solution adopted by the online coating device and method for pre-embedded cast-rolled composite plates of the present invention is as follows:

[0006] An online coating device for pre-embedded cast-rolled composite plates includes, sequentially along the plate conveying direction, an inlet guiding mechanism, a surface pretreatment mechanism, an inlet thickness online detection mechanism, a multi-unit graded coating mechanism, an outlet thickness online detection mechanism, and an outlet guiding mechanism. The inlet and outlet guiding mechanisms are driven synchronously to match the plate conveying speed with the subsequent casting and rolling speed. The surface pretreatment mechanism is used for surface activation treatment before coating. The multi-unit graded coating mechanism comprises several sets of coating units connected in series. Each coating unit is equipped with an atmosphere protection component and a powder recycling component to achieve graded coating of the plate and powder recycling. The inlet and outlet thickness online detection mechanisms are used to detect the plate thickness before and after coating, respectively, to control the coating thickness.

[0007] A further improvement of the technical solution of the present invention is that: the coating unit includes a substrate preheating component, a powder spraying component, and a stress-relief annealing component arranged in sequence; wherein, the substrate preheating component is used to adjust the surface hardness of the plate to adapt to the spraying process, the powder spraying component is a multi-nozzle structure arranged in a horizontal direction to achieve uniform powder spraying, and the stress-relief annealing component is used to eliminate stress hardening between the coating and the substrate.

[0008] A further improvement of the technical solution of the present invention is that: the substrate preheating component is an induction preheating structure with a heating temperature range of 150-400℃; the stress-relief annealing component has a heating temperature range of 200-300℃.

[0009] A further improvement of the technical solution of the present invention is that the powder coating assembly includes a nozzle adjustment mechanism, a plate support mechanism and a plate clamping mechanism; wherein, the nozzle adjustment mechanism has height adjustment and spacing adjustment functions, and the nozzle parameters are controlled through a preset coupling model.

[0010] A further improvement of the technical solution of the present invention is that the nozzle spacing control model of the powder coating component is: d=Wn(1-ε)×(a×h+b), where W is the substrate width, n is the number of nozzles, ε is the coating overlap coefficient, a and b are coupling coefficients, and h is the nozzle height.

[0011] A further improvement of the technical solution of the present invention is that: the stress-relief annealing assembly is provided with a path extension structure, which includes multiple sets of staggered guide rollers, used to adjust the annealing time by adjusting the walking path length of the plate in the annealing area.

[0012] A further improvement of the technical solution of the present invention is that the powder recycling and reuse component includes a powder collection hood, a conveying pipeline, a grading and screening component, and a powder storage component; wherein, the powder collection hood is located below the powder spraying component and the air knife, and is connected to the grading and screening component through the conveying pipeline. The grading and screening component is used to separate spraying powders of different particle sizes, and the separated powders are stored in the corresponding powder storage components for secondary utilization.

[0013] A further improvement of the technical solution of the present invention is that: the surface pretreatment mechanism includes an oil stain cleaning component and a surface roughening component arranged in sequence; wherein, the processing pressure of the surface roughening component is 0.4-0.8MPa, and the surface roughness Ra of the plate after treatment is 3.0-8.0μm.

[0014] A further improvement of the technical solution of the present invention is that: both the inlet thickness online detection mechanism and the outlet thickness online detection mechanism adopt non-contact detection elements, and multiple detection points are provided along the width direction of the plate.

[0015] An online coating method for pre-embedded cast-rolled composite plates includes the following steps:

[0016] S1. The plate to be coated is conveyed along the casting and rolling direction through the inlet guide mechanism. The drive parameters of the inlet guide mechanism and the outlet guide mechanism are adjusted synchronously to make the plate conveying speed consistent with the subsequent casting and rolling speed. After the plate passes through the surface pretreatment mechanism to complete the oil stain cleaning and surface roughening activation treatment in sequence, the initial thickness of the plate is detected by the inlet thickness online detection mechanism.

[0017] S2. Based on the initial thickness of the substrate and the coating thickness process settings in step S1, enter the first coating unit for surface coating; adjust the substrate preheating component of each coating unit to perform online induction heating of the substrate to 150~400℃; adjust the nozzle height and nozzle width through the nozzle adjustment mechanism to ensure coating uniformity; adjust the single coating thickness by adjusting the spraying pressure and spray powder preheating temperature; adjust the working parameters of the stress relief annealing component to achieve the strength of the coating after coating and adapt to subsequent coating processes.

[0018] S3. The coating process of step S2 is repeated sequentially in groups 2 to N. Before spraying, each group of coating units removes unbonded powder from the surface of the board through an air knife cleaning device. The powder recycling component collects and grades the powder to achieve recycling.

[0019] S4. The coated sheet material is transported to the casting and rolling unit through the outlet guide mechanism, and the qualified substrate is directly cast and rolled according to the test results to complete the preparation of the pre-embedded cast and rolled composite plate.

[0020] The technological advancements achieved by this invention due to the adoption of the above technical solutions are as follows:

[0021] This invention ensures that the sheet material conveying speed matches the casting and rolling speed through synchronously driven inlet and outlet guiding mechanisms. It integrates processes such as surface pretreatment, step-by-step coating, thickness detection, and powder recovery into one unit. After coating, the sheet material directly enters the casting and rolling equipment without the need for transfer, thus avoiding damage and oxidation of the coating during the transfer process, shortening the production cycle, and improving production efficiency.

[0022] This invention employs a multi-unit, graded coating mechanism, combined with real-time feedback from online inlet and outlet thickness detection mechanisms. This allows for precise control of process conditions such as preheating temperature, spraying pressure, and nozzle parameters for each coating unit, achieving progressive coating accumulation and precise control. Simultaneously, the surface pretreatment mechanism, through oil removal and precise roughening, achieves a surface roughness of 3.0-8.0 μm on the substrate, providing a clean and activated base surface for spraying and enhancing the adhesion between the coating and the substrate.

[0023] The powder recycling and reuse component of the present invention, through the synergistic effect of the powder collection hood, conveying pipeline, grading and screening component and powder storage component, can collect unbound powder that escapes during the spraying process. After grading and screening, it can realize the classification, recycling and reuse of powders of different particle sizes, reduce raw material waste, reduce production costs, and avoid environmental pollution caused by powder escape.

[0024] This invention, through the coupling model of the nozzle adjustment mechanism, can precisely control the nozzle height and spacing according to different board widths and different coating thickness requirements. With the help of several sets of flexibly selectable coating units, it can adapt to the coating needs of various board specifications. Attached Figure Description

[0025] Figure 1 This is a schematic diagram of the structure of an online coating device for pre-embedded cast-rolled composite plates according to the present invention;

[0026] Figure 2 This is a schematic diagram of the coating unit of an online coating device for pre-embedded cast-rolled composite plates according to the present invention;

[0027] Figure 3 This is a schematic diagram of the annealing path in the stress-relief annealing assembly of an online coating device for pre-embedded cast-rolled composite plates according to the present invention;

[0028] Figure 4 This is a schematic diagram of the powder spraying component of an online coating device for pre-embedded cast-rolled composite plates according to the present invention;

[0029] Figure 5 This is a schematic diagram of the powder recycling and reuse component of an online coating device for pre-embedded cast-rolled composite plates according to the present invention.

[0030] In the attached diagram: 1. Unwinding machine; 2. Inlet guiding mechanism; 3. Surface pretreatment mechanism; 4. Inlet thickness online detection mechanism; 5. Substrate preheating assembly; 6. Coating unit; 7. Stress-relieving annealing assembly; 8. Outlet thickness online detection mechanism; 9. Outlet guiding mechanism; 10. Casting and rolling unit;

[0031] 21. Atmosphere protection assembly; 22. Powder coating assembly; 23. Sheet support mechanism; 24. Air knife; 25. Powder recycling assembly; 26. Powder storage assembly; 27. Conveying pipeline; 28. Guide roller;

[0032] 41. Height adjustment mechanism; 42. Lateral adjustment mechanism; 43. Nozzle inlet; 44. Nozzle outlet; 45. Negative pressure device; 46. Grading and screening assembly. Detailed Implementation

[0033] To make the objectives, technical solutions, and advantages of this invention clearer, the invention will be further described in detail below with reference to specific embodiments and accompanying drawings. In the following description, descriptions of well-known structures and technologies are omitted to avoid unnecessarily obscuring the concept of this invention.

[0034] like Figure 1 As shown, this invention provides an online coating device for pre-embedded cast-rolled composite plates. The aluminum alloy substrate moves uniformly from left to right: it is unwound by the unwinding machine 1, pulled by the inlet guide mechanism 2 which determines the initial linear speed; it enters the plate surface pretreatment mechanism 3 for surface cleaning and activation; the initial thickness is measured by the inlet thickness online detection mechanism 4; the plate is heated by the substrate preheating component 5, and then enters the coating unit 6 for powder spraying. N (two shown in the diagram) coating units with identical structures can be set according to process requirements for layer-by-layer coating. Stress-relieving annealing components 7 are installed between the coating units to eliminate strip stress hardening; after completion, the total coating thickness is detected by the outlet thickness online detection mechanism 8; finally, the coated plate is directly fed into the casting and rolling unit 10 for composite forming by the outlet guide mechanism 9 at a linear speed matched to the casting and rolling speed.

[0035] Figure 2 This describes the internal structure of a single coating unit. The coating unit is under a nitrogen atmosphere provided by the atmosphere protection component 21. The powder spraying component 22 sprays the material, the material support device 23 is located below the material, and the air knife 24 blows the material after spraying. Throughout the process, a powder recycling component 25 is installed below to collect the powder. The collected powder is then stored in the powder storage component 26 via the conveying pipeline 27.

[0036] Figure 3The diagram shows the path of the annealing device. Multiple sets of staggered adjustable guide rollers 28 are set in the annealing chamber, so that the plate forms a reciprocating bending conveying path along the guide rollers 28. The bending path extends the effective travel length of the plate in the chamber, thereby increasing the annealing residence time of the plate in the same equipment space. At the same time, the annealing time requirements of different plates can be flexibly adapted by adjusting the number or position of the guide rollers 28.

[0037] Figure 4 This is a schematic diagram of the powder coating device. The height adjustment mechanism 41 is used to simultaneously control the vertical height of the nozzles, and the lateral adjustment mechanism 42 is used to independently control the lateral spacing of all nozzle slides and the overall coverage width. Accelerating gas enters from the nozzle inlet 43 and sprays powder onto the substrate at the nozzle outlet 44.

[0038] Figure 5 This is a schematic diagram of the powder recovery device. The recovery hood covers the area below the spraying and cleaning zone. A negative pressure device 45 draws the escaping powder into the recovery device, where it is then screened by a grading and screening assembly 46 to separate powders of different particle sizes. The grading and screening assembly 46 classifies the powder according to a set precision of 5-30 μm, and powders of different sizes fall into their respective storage tanks for reuse.

[0039] This invention also provides an online coating method for pre-embedded cast-rolled composite plates, comprising the following steps:

[0040] S1: The substrate material is fed into the production line at a constant speed through the coordinated speed control of the inlet guide mechanism 2 and the outlet guide mechanism 9. The substrate first passes through the surface pretreatment mechanism 3, where it undergoes oil cleaning and abrasive wheel polishing. The abrasive wheel polishing device treats the inner surface of the substrate under a pressure of 0.4-0.8 MPa, achieving a surface roughness Ra of 3.0-8.0 μm, thus obtaining a clean and activated surface. After pretreatment, the substrate passes through the inlet thickness online detection mechanism 4, which measures the initial thickness of the substrate online.

[0041] S2: The substrate enters the coating unit 6 and is coated layer by layer through multiple sets of coating units 6. First, the substrate is heated online by the substrate preheating component 5 to regulate the substrate strength; the heating temperature is 150-400℃. Then, the powder coating component 22 dynamically adjusts the nozzle height and spraying spacing through the height adjustment mechanism 41 and the lateral adjustment mechanism 42 to perform spraying. The nozzle spacing control model of the cold spraying device is as follows: Where W is the base width and n is the number of nozzles. denoted as the spray overlap coefficient, a and b as coupling coefficients, and h as the nozzle height. The thickness of a single coating is controlled by adjusting the spray pressure and powder preheating temperature. Subsequently, the stress-relief annealing component 7 performs online annealing on the coating to eliminate stress hardening at a temperature of 200-300℃, preparing for the next coating layer or final lamination. The online thickness detection mechanism 8 at the outlet monitors the thickness of this layer.

[0042] S3: Coating units 2-N, based on the thickness detection of the previous coating stage, use air knife 24 to blow away unbonded powder remaining on the substrate surface. Simultaneously, the powder recovery and reuse component 25 below collects the blown-off powder. The powder is then separated into different particle sizes by the grading and screening component 46 for secondary reuse. The grading and screening accuracy is 5-30μm. The recovered mixed powder mainly consists of aluminum-based powder and... Powders, wherein the typical particle size range of aluminum-based powders is 25-30 μm. The typical particle size range of the powder is 5-10 μm. A vibrating sieve is used to effectively separate and recover powders with different particle size characteristics.

[0043] S4: The coated sheet material is transported to the casting and rolling unit 10 through the outlet guide mechanism 9, and the qualified substrate is directly cast and rolled according to the test results. Under the combined action of high temperature and high pressure, the pre-embedded cast and rolled composite plate is prepared.

[0044] The present invention will be further illustrated below through specific embodiments:

[0045] Example 1

[0046] The embedded cast-rolled composite plate produced in this embodiment is suitable for applications requiring balanced overall performance, such as automotive heat exchangers. It employs a single-sided online spraying-casting process. The substrate for spraying is 4343 aluminum alloy, and the spraying powder is an Al-Si alloy... The mixed powder, with a mass ratio of 4:1, is used in the casting and rolling process. The coating is made of sprayed 4343 aluminum alloy, and the core material is 3003 aluminum alloy. The pre-embedded flux layer is coated in stages through two sets (N=2) of coating units 6 connected in series. The substrate thickness is 1mm, the width is 1000mm, and the substrate conveying speed is 1.2m / min.

[0047] S1: Online surface treatment and substrate thickness detection: The 4343 aluminum alloy substrate is fed into the production line at a speed of 1.2 m / min. First, it is treated by the surface pretreatment mechanism 3, with a grinding wheel pressure of 0.6 MPa. After treatment, the surface roughness Ra of the substrate is 5.5 μm, and the substrate thickness is measured to be 1.01 mm by the online thickness detection mechanism 4.

[0048] S2: Online heating of the substrate and surface spraying: The substrate is heated online by the substrate preheating component 5, and the heating temperature is set to 200℃. Subsequently, the powder coating component 22 performs spraying, based on the coupled model. Where W is the base width and n is the number of nozzles. The coating overlap coefficient is denoted by h, and the nozzle height is denoted by h. The coating overlap coefficient is set to 0.15, the nozzle spacing d = 120 mm, and the nozzle height is 50 mm. The powder feeding rate is 180 g / min. Subsequently, the stress-relief annealing assembly 7 performs online annealing on the coating to eliminate stress hardening. The annealing temperature is 330℃, and the holding time is 30 min. After annealing, a second coating is applied. After coating, the thickness of the first coating (0.11 mm) and the thickness of the second coating (0.24 mm) are measured by the online thickness detection mechanism 8.

[0049] S3: Powder Online Cleaning and Recycling. The substrate after spraying is purged by air knife 24 at a pressure of 0.5 MPa to remove unbonded powder from the surface. Powder released during spraying and air knife cleaning is collected by the powder recycling and reuse component 25 below, and then classified and collected by the grading and screening component 46.

[0050] S4: In-line casting and rolling composite forming involves directly feeding the substrate with qualified coating thickness into the casting and rolling unit 10, where in-line composite forming is performed at a casting and rolling temperature of 620℃. The casting and rolling speed is synchronized with the production line at 1.2m / min, and the casting and rolling exit is 8mm. Finally, in-line winding yields a pre-embedded cast and rolled composite plate with a total thickness of 8mm.

[0051] The performance of the composite board obtained above was tested: the interface of the composite board was found to be uniform and dense, the thickness of the 4343 aluminum alloy was 0.8 mm, the thickness of the pre-embedded flux was 0.18 mm, and the thickness of the composite board was 8 mm. The production line achieved continuous production from substrate loading to finished product winding, which improved production efficiency by about 60% compared with the traditional offline process, and the comprehensive utilization rate of the sprayed powder exceeded 85%.

[0052] Example 2

[0053] The embedded cast-rolled composite plate produced in this embodiment is suitable for components with complex structures. It employs an online spraying-double-sided casting and rolling process. The spraying substrate is 4343 aluminum alloy, and the spraying powder is pure Al. The mixed powder, with a mass ratio of 5:1, is used in the casting and rolling process. The coating is made of sprayed 4047 aluminum alloy, and the core material is 3003 aluminum alloy. The pre-embedded flux layer is coated in stages through three sets (N=3) of coating units 6 connected in series. The substrate thickness is 0.6 mm, the width is 800 mm, and the substrate conveying speed is 1 m / min.

[0054] S1: Online surface treatment and substrate thickness detection: The 4343 aluminum alloy substrate is fed into the production line at a speed of 0.8 m / min. First, it is treated by the surface pretreatment mechanism 3, with a grinding wheel pressure of 0.5 MPa. After treatment, the surface roughness Ra of the substrate is 4.2 μm, and the substrate thickness is measured to be 0.59 mm by the online thickness detection mechanism 4.

[0055] S2: Online heating of the substrate and surface spraying: The substrate is heated online by the substrate preheating component 5, and the heating temperature is set to 150℃. Subsequently, the powder coating component 22 performs spraying, based on the coupled model. Where W is the base width and n is the number of nozzles. The coating overlap coefficient is denoted by h, and the nozzle height is denoted by h. The coating overlap coefficient is set to 0.15, the nozzle spacing d = 155 mm, and the nozzle height is 60 mm. The powder feeding rate is 120 g / min. Subsequently, the stress-relief annealing assembly 7 performs online annealing on the coating to eliminate stress hardening. The annealing temperature is 300℃, and the holding time is 30 min. After annealing, a second coating is applied, followed by a second annealing, and then a third coating. After coating completion, the online thickness detection mechanism 8 measures the coating thickness as follows: the first coating thickness is 0.06 mm, the second coating thickness is 0.11 mm, and the third coating thickness is 0.15 mm.

[0056] S3: Online Powder Cleaning and Recycling: The coated substrate is purged by an air knife 24 at a pressure of 0.5 MPa to remove unbonded powder from the surface. Powder released during the coating and air knife cleaning process is collected by the powder recycling and reuse component 25 below, and then classified and collected by the grading and screening component 46.

[0057] S4: Online Casting and Rolling Composite Forming: The substrate with qualified coating thickness is directly fed into the casting and rolling unit 10, and online composite forming is carried out at a casting and rolling temperature of 610℃. The casting and rolling speed is synchronized with the production line at 1.0m / min, and the casting and rolling exit is 5mm. Finally, the embedded cast and rolled composite plate with a total thickness of 5mm is obtained by online winding.

[0058] The performance of the composite board obtained above was tested experimentally:

[0059] Testing revealed that the composite board interface is uniformly and densely bonded, with a 4047 aluminum alloy thickness of 0.5mm, a pre-embedded flux thickness of 0.12mm, and a composite board thickness of 5mm. The production line achieves fully continuous production from substrate loading to finished product winding, increasing production efficiency by approximately 60% compared to traditional offline processes, and achieving a comprehensive utilization rate of over 85% for the sprayed powder.

[0060] In the above embodiments, an online coating device and method for pre-embedded cast-rolled composite plates are provided. This invention ensures that the plate conveying speed matches the casting and rolling speed through synchronously driven inlet and outlet guiding mechanisms. It integrates processes such as surface pretreatment, step-by-step coating, thickness detection, and powder recovery into one unit. After coating, the plate directly enters the casting and rolling equipment without the need for transfer, avoiding damage and oxidation of the coating during transfer, shortening the production cycle, and improving production efficiency. This invention adopts a multi-unit graded coating mechanism, combined with real-time feedback from the inlet thickness online detection mechanism and the outlet thickness online detection mechanism, which can accurately control the preheating temperature, spraying pressure, nozzle parameters, and other process conditions of each coating unit, realizing the step-by-step accumulation and precise control of the coating. Meanwhile, the surface pretreatment mechanism cleans oil stains and performs precise roughening treatment, achieving a surface roughness of 3.0-8.0 μm for the substrate, providing a clean and activated base surface for spraying and enhancing the adhesion between the coating and the substrate. The powder recycling and reuse component of this invention, through the synergistic action of the powder collection hood, conveying pipeline, grading and screening component, and powder storage component, can collect unbonded powder that escapes during the spraying process. After grading and screening, it achieves the classification, recycling, and reuse of powders of different particle sizes, reducing raw material waste, lowering production costs, and avoiding environmental pollution caused by powder escape. Through the coupling model of the nozzle adjustment mechanism, this invention can precisely adjust the nozzle height and spacing according to different substrate widths and coating thickness requirements. With several sets of flexibly selectable coating units, it can adapt to the coating needs of various substrate specifications.

[0061] The embodiments described above are merely preferred embodiments of the present invention and are not intended to limit the concept and scope of the present invention. Various modifications and improvements made to the technical solutions of the present invention by those skilled in the art without departing from the inventive concept should fall within the protection scope of the present invention. All technical contents for which protection is sought in this invention are fully described in the claims.

Claims

1. A pre-embedded cast-rolled composite plate on-line coating apparatus, characterized by: The entrance guide mechanism (2), the surface pretreatment mechanism (3), the entrance thickness online detection mechanism (4), the multi-unit grading coating mechanism, the exit thickness online detection mechanism (8) and the exit guide mechanism (9) are sequentially arranged along the plate conveying direction; wherein the entrance guide mechanism (2) and the exit guide mechanism (9) are synchronously driven, so that the plate conveying speed is matched with the subsequent casting and rolling speed; the surface pretreatment mechanism (3) is used for surface activation treatment before plate coating; the multi-unit grading coating mechanism comprises a plurality of groups of coating units (6) connected in series, and an atmosphere protection assembly (21) and a powder recycling assembly (25) are arranged in each coating unit (6), so as to realize step-by-step coating and powder recycling of the plate; the entrance thickness online detection mechanism (4) and the exit thickness online detection mechanism (8) are respectively used for detecting the thickness of the plate before and after coating, so as to control the coating layer thickness.

2. A device for on-line coating of pre-embedded rolled composite panels according to claim 1, characterized in that: The coating unit (6) comprises the substrate preheating assembly (5), the powder spraying assembly (22) and the stress relief annealing assembly (7) which are sequentially arranged; wherein the substrate preheating assembly (5) is used for adjusting the surface hardness of the plate to adapt to the spraying process, the powder spraying assembly (22) is a multi-nozzle structure arranged transversely, and is used for realizing uniform spraying of the powder, and the stress relief annealing assembly (7) is used for eliminating the stress hardening of the coating and the substrate.

3. A device for on-line coating of pre-embedded rolled composite panels according to claim 2, characterized in that: The substrate preheating assembly (5) is an induction preheating structure, and the heating temperature range is 150-400 DEG C; the heating temperature range of the stress relief annealing assembly (7) is 200-300 DEG C.

4. The on-line coating apparatus for pre-embedded rolled composite board according to claim 2, characterized in that: The powder spraying assembly (22) comprises a nozzle adjusting mechanism, a plate supporting mechanism (23) and a plate pressing mechanism; wherein the nozzle adjusting mechanism has height adjusting and spacing adjusting functions, and realizes the adjustment and control of the nozzle parameters through a preset coupling model.

5. A device for on-line coating of pre-embedded rolled composite panels according to claim 4, characterized in that: The nozzle spacing control model of the powder spraying assembly (22) is d=Wn (1-ε) x (a x h+b), wherein W is the substrate width, n is the number of nozzles, ε is the spraying overlap coefficient, a and b are coupling coefficients, and h is the nozzle height.

6. The on-line coating apparatus for pre-embedded rolled composite board according to claim 2, characterized in that: The stress relief annealing assembly (7) is provided with a path extension structure, and the path extension structure comprises a plurality of groups of guide rollers (28) arranged in a staggered manner, and is used for adjusting the walking path length of the plate in the annealing area to control the annealing time.

7. The on-line coating apparatus for pre-embedded rolled composite board according to claim 2, characterized in that: The powder recycling assembly (25) comprises a powder collecting cover, a conveying pipeline (27), a grading screening assembly (46) and a powder storage assembly (26); wherein the powder collecting cover is arranged below the powder spraying assembly (22) and the air knife (24), is connected with the grading screening assembly (46) through the conveying pipeline (27), the grading screening assembly (46) is used for separating the spraying powder of different particle sizes, and the separated powder is stored in the corresponding powder storage assembly (26) to realize secondary utilization.

8. The on-line coating apparatus for pre-embedded rolled composite panels according to claim 1, characterized in that: The surface pretreatment mechanism (3) comprises an oil cleaning assembly and a surface roughening assembly which are sequentially arranged; wherein the treatment pressure of the surface roughening assembly is 0.4-0.8 MPa, and the surface roughness Ra of the plate after treatment is 3.0-8.0 μm.

9. The on-line coating apparatus for pre-embedded rolled composite panels according to claim 1, characterized in that: The inlet thickness online detection mechanism (4) and the outlet thickness online detection mechanism (8) both adopt non-contact detection elements, and multiple detection points are arranged along the width direction of the plate.

10. A method for on-line coating of pre-embedded cast-rolled composite panels, characterized in that, The coating device according to any one of claims 1-9, comprising the following steps: S1, conveying the plate to be coated along the casting direction through the inlet guide mechanism (2), synchronously adjusting the driving parameters of the inlet guide mechanism (2) and the outlet guide mechanism (9) to make the plate conveying speed consistent with the subsequent casting speed; after the plate is sequentially subjected to oil stain cleaning and surface roughening activation treatment by the surface pretreatment mechanism (3), the initial thickness of the plate is detected by the inlet thickness online detection mechanism (4); S2, according to the initial thickness of the plate in step S1 and the coating thickness process setting parameters, the first group of coating units (6) is entered to perform surface layer coating; the substrate plate is subjected to online induction heating by adjusting the base preheating assembly (5) of each group of coating units (6) to heat to 150-400 DEG C; the nozzle height and nozzle width are adjusted by the nozzle adjusting mechanism to ensure the uniformity of coating; the single coating thickness is adjusted by adjusting the spraying pressure and the preheating temperature of the sprayed powder; the strength of the coating after coating is realized by adjusting the working parameters of the stress relief annealing assembly (7), and the subsequent coating process is adapted; S3, the second to Nth group of coating units (6) repeatedly perform the coating process of step S2, and the unbound powder on the surface of the plate is removed by the air knife (24) cleaning device before spraying of each group of coating units (6), the powder recovery and recycling assembly (25) collects and classifies the powder, and realizes recycling; S4, conveying the coated plate to the casting device through the outlet guide mechanism (9), and directly casting and rolling the qualified substrate according to the detection result to complete the preparation of the embedded casting and rolling composite plate.

Images