High-strength tin-plated thin plate and preparation process thereof

Abstract

The invention relates to the technical field of tinned sheet preparation systems, and particularly discloses a high-strength tinned sheet and a preparation process thereof.The preparation process comprises the following steps that S1, raw materials are smelted to obtain a continuous casting billet, the continuous casting billet is sequentially subjected to hot rolling and cold rolling treatment to obtain strip steel, and then annealing is conducted to eliminate the stress of the strip steel and soften the strip steel; and S2, the strip steel is subjected to acid pickling to remove oxide skin, and then electrolytic cleaning is carried out to clean and remove oil. According to the high-strength tin-plated thin plate and the preparation process thereof, the cleaned emulsion containing the alkaline solution is filtered through the filter cover and conveyed to the surface of the untreated thin plate strip without power, so that the residual alkaline solution in the emulsion can pre-clean the surface of the thin plate strip; and the cleaning position is brushed by matching with the brush piece with the brush wires, and complete cleaning work is carried out until the sheet strip reaches the position of the spray head, so that the cleaning effect on stubborn dirt is improved while efficient utilization of the alkaline solution is realized.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of tinned sheet production system, in particular to a high-strength tinned sheet and a preparation process thereof. BACKGROUND

[0002] Tinned sheet, commonly known as tinplate, is often used in the manufacture of food and beverage cans, and the process of processing tinned sheet includes raw material slitting, pickling, cold rolling, cleaning and degreasing, annealing, flattening, finished product finishing, straightening, tinning, etc.

[0003] As disclosed in Publication (Announcement) No. CN106142785A, published on November 23, 2016, a tinned sheet composite biaxially oriented polyester film and a preparation method thereof are disclosed. The film is composed of an upper surface layer, a core layer and a lower surface layer. The composition of the core layer is a mixture of polyester chips, copolymerized polypropylene chips and vinyl-terminated polyester, wherein the content of copolymerized polypropylene chips is 10-25 wt%, and the content of vinyl-terminated polyester is 0.5-5 wt%. The upper surface layer is composed of polyester chips and polyester anti-adhesive, wherein the content of polyester anti-adhesive is 0.10-0.50 wt%. The lower surface layer is composed of PETG and polyester anti-adhesive, wherein the content of polyester anti-adhesive is 0.10-0.5 wt%. The tinned sheet composite biaxially oriented polyester film is made by adopting a three-layer co-extrusion and biaxial stretching process.

[0004] As disclosed in Publication (Announcement) No. CN221335769U, published on July 16, 2024, a surface oil removal device for tinned sheet production and processing is disclosed. The device includes a storage bin containing cleaning liquid and an oil removal chamber, and the tinned sheet continuously passes through the storage bin and the oil removal chamber to achieve cleaning and oil removal. Subsequently, hot air drying treatment is adopted.

[0005] The existing technology has the following disadvantages. In response to the tinned sheet cleaning and degreasing work of the continuous production line, in order to adapt to the "high beat" characteristics, a spray cleaning and degreasing method is usually adopted, and a liquid pump is used to continuously supply high-pressure alkaline solution to the spray head to achieve low-cost, high-quality and high-efficiency emulsification reaction degreasing. However, when there is a lot of stubborn dirt on the surface of the tinned sheet, it is difficult to remove using the spray cleaning method, and even if the soaking cleaning method is used, it cannot achieve high-efficiency removal of stubborn dirt, resulting in a small amount of oil remaining on the surface of the tinned sheet, which affects the surface cleanliness and safety of the finished tinned sheet. In addition, manual cleaning of stubborn dirt is not only inefficient but also prone to accidental bumps. SUMMARY

[0006] The purpose of the present application is to provide a high-strength tinned sheet and a preparation process thereof to solve the above-mentioned deficiencies in the prior art.

[0007] In order to achieve the above object, the present application provides the following technical solutions: A high-strength tin-plated sheet preparation process, comprising the following steps: S1, smelting raw materials and obtaining continuous casting billets, sequentially performing hot rolling and cold rolling on the continuous casting billets to obtain a steel strip, and then performing annealing to eliminate the stress and soften the steel strip; S2, pickling the steel strip to remove the oxide scale, and then performing electrolytic cleaning to clean and remove oil; S3, cutting the steel strip into a required number of strips using a slitting machine to obtain a sheet strip; S4, cleaning and degreasing the sheet strip using an alkaline solution to remove residual oil and grease on the surface; S5, continuously feeding the cleaned sheet strip into an electroplating tank for tin layer electroplating, and then performing alloy material plating; S6, immersing the plated sheet strip into a chromate solution for passivation, and then coating lubricating oil and protective material; S7, using a flattening machine to roll the coated sheet strip to eliminate the waviness of the plate surface and improve the surface gloss of the sheet strip.

[0008] As a further description of the above technical solutions, at least a degreasing device for cleaning the surface of the sheet strip in step S4 is further included, and the degreasing device comprises: a spraying cover for conveying the running sheet strip; a spray head symmetrically distributed on both end surfaces of the sheet strip; a filter cover located below the spray head and used for receiving and filtering the emulsion flowing downward from the end surface of the sheet strip; a liquid tank frame for conveying the emulsion containing the alkaline solution filtered by the filter cover to the front of the running sheet strip.

[0009] As a further description of the above technical solutions, the spraying cover is fixedly installed with a carrier and a bracket for clamping the filter cover at a predetermined angle.

[0010] As a further description of the above technical solutions, the filter cover is fixedly installed with a filter plate forming an upper retention section with the inner wall thereof.

[0011] As a further description of the above technical solutions, a baffle plate is further arranged in parallel with the filter plate, the baffle plate is provided with through holes arranged at equal intervals, and the through hole ports are fixedly installed with baffle strips for blocking the flow of the emulsion.

[0012] As a further description of the above technical solutions, the filter cover is further fixedly installed with a shutter, and the shutter is fixedly installed with a nozzle port for spraying the alkaline solution.

[0013] As a further description of the above technical solutions: further comprising a brush member arranged at the end of the filter cover and driven to rotate, and the brush member is in contact with the end face of the thin strip.

[0014] As a further description of the above technical solutions: the end of the brush member is fixedly installed with a blade for intermittent knocking of the filter plate.

[0015] As a further description of the above technical solutions: further comprising a locking member arranged at the end of the brush member, and the locking member is locked with any of the bars to lock the brush member.

[0016] A high-strength tin-plated sheet includes a thin strip obtained by the preparation process of the high-strength tin-plated sheet according to any one of the above technical solutions, the thin strip includes a substrate layer, a tin layer plated on the outside of the substrate layer, and the surface of the tin layer is passivated, an alloy layer arranged on the outside of the tin layer, a protective layer arranged on the outside of the alloy layer, and an enhancement layer arranged on the outside of the protective layer.

[0017] In the above technical solutions, the high-strength tin-plated sheet and the preparation process thereof provided by the present application have the following beneficial effects: the emulsion containing the alkaline solution after cleaning is filtered by the filter cover, and the emulsion is transported by gravity from the liquid tank frame obliquely arranged on both sides of the filter cover to the surface of the untreated thin strip, so that the residual alkaline solution in the emulsion can pre-clean the surface of the thin strip, and the cleaning position is brushed by the brush member with brush wires until the thin strip reaches the position of the spray head for complete cleaning, thereby realizing efficient use of the alkaline solution, improving the cleaning effect of stubborn dirt, and effectively reducing the existence of stubborn dirt on the surface of the thin strip. BRIEF DESCRIPTION OF DRAWINGS

[0018] In order to more clearly illustrate the technical solutions in the embodiments or the prior art, the drawings needed in the embodiments will be briefly introduced below. Obviously, the drawings in the following description are only some embodiments described in the present application, and other drawings can also be obtained by those skilled in the art based on these drawings.

[0019] Figure 1 A degreasing device production line schematic diagram provided by the embodiment of the present application; Figure 2 A can removal conveyor schematic diagram provided by the embodiment of the present application; Figure 3 A spray cover and thin strip assembly schematic diagram provided by the embodiment of the present application; Figure 4 A spray cover and thin strip assembly schematic diagram provided by the embodiment of the present application for removing half doors; Figure 5 A spray cover and thin strip assembly front view schematic diagram provided by the embodiment of the present application for removing all doors; Figure 6 The schematic diagram of the symmetrically distributed bearing frame and bracket provided for the embodiment of the present application; Figure 7 The schematic diagram of the symmetrically distributed liquid tank frame provided for the embodiment of the present application; Figure 8 The schematic diagram of the assembly of the thin plate strip in the spray cover and the symmetrically distributed spray head and filter cover provided for the embodiment of the present application; Figure 9 The schematic diagram of the left side view of the filter cover provided for the embodiment of the present application; Figure 10 The schematic diagram of the right side view of the filter cover provided for the embodiment of the present application; Figure 11 The schematic diagram of the front view of the filter cover provided for the embodiment of the present application; Figure 12 The enlarged schematic diagram of A of the filter cover provided for the embodiment of the present application; Figure 11 Figure 13 The schematic diagram of the explosion of the internal components of the filter cover provided for the embodiment of the present application; Figure 14 The schematic diagram of the explosion of the internal components of the filter cover provided for the embodiment of the present application; Figure 15 The schematic diagram of the explosion of the brush and locking parts provided for the embodiment of the present application; Figure 16 The schematic diagram of the thin plate provided for the embodiment of the present application.

[0020] Explanation of the reference signs: 1, degreasing device; 11, conveyor; 2, spray cover; 21, door plate; 3, roller; 31, thin plate strip; 311, base plate layer; 312, tin layer; 313, alloy layer; 314, protection layer; 315, enhancement layer; 4, spray frame; 41, bearing frame; 411, storage tank; 412, slot hole; 42, bracket; 43, frame notch; 44, vertical slot; 5, spray head; 6, filter cover; 60, sliding block; 61, filter plate; 610, upper retention section; 62, baffle; 620, lower retention section; 621, baffle strip; 622, first elastic strip; 623, through hole; 63, shutter; 631, table mouth; 64, cover notch; 641, fixed strip; 642, second elastic strip; 65, shaft hole; 66, discharge port; 67, lock hole; 7, rotating shaft; 71, brush; 72, stop block; 73, blade; 8, locking part; 81, support ring; 82, lock rod; 83, washer; 9, liquid tank frame; 91, leakage hole. DETAILED DESCRIPTION

[0021] In order for those skilled in the art to better understand the technical solutions of the present application, the present application will be further described in detail below with reference to the drawings.

[0022] ​Embodiment one A high-strength tin-plated sheet preparation process, comprising the following steps: S1, smelting raw materials and obtaining continuous casting billets, sequentially performing hot rolling and cold rolling on the continuous casting billets to obtain a strip steel, and then performing annealing to eliminate the stress and soften the strip steel; S2, pickling the strip steel to remove the oxide scale, and then performing electrolytic cleaning to clean and remove oil; S3, using a slitting machine to cut the strip steel into a required number of strips, and obtaining a sheet strip 31; S4, using a spray head 5 to spray an alkaline solution to clean and degrease the sheet strip 31, in the process, a brush piece 71 with a brush wire is matched to roll and brush, at the same time, the emulsion containing the alkaline solution after reaction is delivered to the front of the spray cleaning station without power, and the sheet strip 31 that has not been treated is pre-cleaned with the alkaline solution, and the brush piece 71 is matched again to efficiently brush, so as to remove the residual oil and grease on the surface; S5, the cleaned sheet strip 31 is continuously sent into an electroplating tank to perform tin layer electroplating, and then alloy material plating is performed; S6, the plated sheet strip 31 is immersed in a chromate solution for passivation, and then lubricating oil is coated, and protective material is coated; S7, using a leveler to roll the sheet strip 31 after coating treatment, so as to eliminate the waviness of the plate surface and improve the surface gloss of the sheet strip 31.

[0023] Embodiment two Please refer to Figures 1-14 The embodiment of the present application provides a technical scheme: according to the high-strength tin-plated sheet preparation process, at least a degreasing device 1 for cleaning the surface grease of the sheet strip 31 in step S4 is further included, and the degreasing device 1 comprises: a spray cover 2 for conveying the sheet strip 31 running inside; a spray head 5 symmetrically distributed on both end surfaces of the sheet strip 31; a filter cover 6 located below the spray head 5 and used for receiving and filtering the emulsion flowing downward from the end surface of the sheet strip 31; a liquid tank frame 9 for conveying the emulsion containing the alkaline solution filtered by the filter cover 6 to the front of the sheet strip 31 running.

[0024] Specifically, the degreasing device 1 is respectively provided with conveyors 11 on both sides of the production line, so as to provide conveying traction to the sheet strip 31, so that the sheet strip 31 can stably run on the roll 3 arranged to rotate in the spray cover 2, and the conveying traction of the sheet strip 31 is the prior art, which will not be described here.

[0025] Further, Figure 3The spray cover 2 is a separate part of the production line of the degreasing device 1, and one side of the spray cover 2 is open, and a door plate 21 is hingedly installed on the opening (a buckle lock or a key lock of the prior art is used for locking to make the door plate 21 keep closed to the opening in the default state, and a hole is formed in the door plate 21 for the pipeline to pass through). An outlet for collecting waste emulsion is arranged at the bottom of the spray cover 2.

[0026] Further, the spray cover 2 is detachably installed on the inner wall of the spray cover 2 by welding or bolts, and the spray head 5 is detachably installed on the spray cover 4 by bolts and nuts, so that two opposite spray heads 5 in the horizontal direction can provide stable alkaline solution spraying treatment to both sides of the sheet strip 31. Figure 5 As shown in the figure, the claw-shaped line represents the direction of the alkaline solution sprayed by the spray head 5.

[0027] Further, the filter cover 6 is also symmetrically distributed on both end surfaces of the sheet strip 31, and two filter covers 6 in the horizontal direction form a group, and multiple groups are arranged in the vertical direction, so that each group forms a layered space for the sheet strip 31, and the spray head 5 is located in the middle of the space, which can not only satisfy the high-efficiency spraying of the spray head 5 to the area that can be processed by itself, but also reduce the interference of the emulsion to the remaining position.

[0028] The alkaline solution sprayed on the surface of the sheet strip 31 reacts and flows down along the surface of the sheet strip 31, and is filtered when reaching the filter cover 6, so that the emulsion containing the alkaline solution enters the inclined liquid tank frame 9 on both sides of the filter cover 6, and under the action of gravity, the emulsion containing the alkaline solution is transported to the surface of the untreated sheet strip 31, so that the residual alkaline solution in the emulsion can pre-clean the surface of the sheet strip 31, and the alkaline solution is completely cleaned when the sheet strip 31 reaches the position of the spray head 5, which realizes efficient use of the alkaline solution and improves the cleaning effect of stubborn dirt, effectively reducing the existence of stubborn dirt on the surface of the sheet strip 31 (similar to the function of dishwashing detergent for cleaning oil stains).

[0029] In another embodiment of the present application, a bearing frame 41 and a bracket 42 for supporting the filter cover 6 at a predetermined angle are fixedly installed in the spray cover 2.

[0030] Specifically, the bearing frame 41 and the bracket 42 are detachably installed by welding or bolts, and the height of the bracket 42 at the working position of the spray head 5 is higher than the height of the bearing frame 41. Figure 5 As shown in the figure, the height of the bracket 42 at the pre-treatment working position is lower than the height of the bearing frame 41, and the filter cover 6 at the pre-treatment working position is used to receive the emulsion discharged from the low position of the liquid tank frame 9, so that the filter cover 6 at the pre-treatment position performs secondary filtering treatment on the emulsion, further reducing the influence of particulate matter on pre-cleaning.

[0031] Further, the high position of the liquid tank frame 9 is detachably fixed on the bearing frame 41 (at a low position) by bolts, and the low position of the liquid tank frame 9 abuts on the bearing frame 41 (at a high position), and the low position of the liquid tank frame 9 is provided with a drain hole 91.

[0032] Further, the side of the square filter cover 6 is integrally formed with two sliding blocks 60, and the sliding blocks 60 are symmetrically distributed on both sides of the filter cover 6. The bearing frame 41 and the bracket 42 are both provided with a frame notch 43 for embedding the filter cover 6, and the inner wall of the frame notch 43 is symmetrically provided with a vertical groove 44 for sliding insertion of the sliding block 60.

[0033] Further, the bearing frame 41 is provided with an accumulation tank 411 for temporarily storing emulsion, and the accumulation tank 411 is provided with tank holes 412 for discharging emulsion downward, and the tank holes 412 are communicated with the channel of the high position of the liquid tank frame 9.

[0034] By vertically sliding and inserting the filter cover 6 on the bearing frame 41 and the bracket 42, the filter cover 6 can be quickly disassembled, and the filter cover 6 can be regularly taken down for cleaning. At the same time, the same specification filter cover 6 can also be installed on the pretreatment station, so that the emulsion can be effectively filtered and pretreated before cleaning the sheet strip 31, and the safety of the surface of the sheet strip 31 is guaranteed.

[0035] In another embodiment of the present application, the filter cover 6 is fixedly provided with a filter plate 61 forming an upper retention section 610 with the inner wall thereof.

[0036] Specifically, the filter plate 61 is a filtering element for filtering out particulate matter in emulsion in the prior art, which will not be described here, and the filter plate 61 is detachably installed in the filter cover 6 by bolts.

[0037] The filter cover 6 is installed obliquely to incline the filter plate 61, so that the upper retention section 610 formed by the low position of the filter plate 61 can collect and block the particulate matter and scum, and the obliquely arranged filter plate 61 can also defoam the scum to avoid excessive foam in the scum from interfering with the downward filtration and delivery of the emulsion, so that the downward delivered emulsion is more pure and less impurities. When the filter plate 61 is cleaned later, the particulate matter in the upper retention section 610 can be concentrated and removed, reducing the workload.

[0038] In another embodiment of the present application, a baffle plate 62 is also provided parallel to the filter plate 61, the baffle plate 62 is provided with through holes 623 arranged at equal intervals, and the through holes 623 are fixedly provided with baffle strips 621 for blocking the delivery of emulsion.

[0039] Specifically, the baffle plate 62 is also detachably installed in the filter cover 6 by bolts, and the baffle plate 62 is specifically made of a resilient metal plate. The end of the arc-shaped baffle strip 621 is welded with a first elastic strip 622 made of a resilient metal sheet, and when the first elastic strip 622 is deformed, the end thereof can contact the lower end surface of the filter plate 61.

[0040] Furthermore, a lower retention section 620 (located at the lower level of the baffle 62) is formed between the baffle 62 and the inner wall of the filter housing 6. This lower retention section 620 directly receives particulate matter that seeps out of the upper retention section 610, thus preventing any leakage. Furthermore, the emulsion accumulated in the lower retention section 620 is lower than the lower end surface of the filter plate 61, thus preventing the filter plate 61 from failing.

[0041] The emulsion processed by the filter plate 61 reaches the baffle 62, so that the filtered emulsion is discharged downward from the multiple through holes 623 out of the filter cover 6, and the multiple baffles 621 and the first elastic strips 622 thereon form a protective space for the through holes 623 to prevent foam accumulation and blockage of the through holes 623 for drainage, and the lower retention section 620 can perform secondary retention of the missed particles, further improving the purity of the filtered emulsion.

[0042] In another embodiment provided by the present invention, a shield plate 63 is fixedly installed in the filter cover 6, and a platform mouth 631 for the drainage nozzle 5 to spray the alkaline solution is fixedly installed on the shield plate 63.

[0043] Specifically, a discharge port 66 is provided on the lower side wall of the filter cover 6 above the shield 63 , so that the emulsion discharged from the through hole 623 can enter the storage tank 411 through the discharge port 66 , thereby completing the transfer of the filtered emulsion.

[0044] Furthermore, the platform mouth 631 is a tubular body with a trapezoidal cross section, which enables it to function as a venturi tube. At the same time, the upper end of the platform mouth 631 is staggered with the through hole 623 to reduce the possibility of the emulsion flowing downward from the through hole 623 entering the platform mouth 631.

[0045] The emulsion discharged from the through hole 623 is guided by the shield 63 and discharged from the filter cover 6, thereby achieving centralized collection and discharge of the emulsion. Furthermore, since the alkaline solution sprayed by the nozzle 5 fills the entire spraying space, some of the alkaline solution will enter from the platform opening 631 under the action of pressure. The alkaline solution that enters above the shield 63 can, on the one hand, perform air blowing impact on the lower end surface of the baffle 62, reducing foam adhesion around the lower end of the through hole 623. On the other hand, after the drips converge, they mix with the discharged emulsion to increase the alkaline content of the emulsion, so that the emulsion used for pretreatment contains more alkaline solution, and the pre-cleaning effect is stronger.

[0046] In another embodiment provided by the present invention, it further includes a brush member 71 which is arranged at the end of the filter cover 6 and is driven to rotate, and the brush member 71 maintains contact with the end surface of the thin plate belt 31.

[0047] Specifically, the filter cover 6 is provided with a cover gap 64 at a high position, and a fixing strip 641 is integrally formed in the cover gap 64, and the filter plate 61 is detachably installed on the fixing strip 641, so as to sacrifice the length of part of the filter plate 61, and in return, the activity space of the brush piece 71 is obtained.

[0048] Further, the second elastic strip 642 is welded on the fixing strip 641 and located outside the brush piece 71, and the end of the second elastic strip 642 is located inside the end of the filter cover 6. When the filter cover 6 is used in the pre-cleaning station, the inclined end of the second elastic strip 642 does not cause pressure injury to the surface of the sheet strip 31 (the brush piece 71 in the pre-cleaning station is in a low position and still in contact with the surface of the sheet strip 31 (the high position and the low position refer to the position height in the station)). Figure 5 As shown in the figure, in the spraying station, the raised position of the second elastic strip 642 (in the state of upward tilting) provides flow guidance for the emulsion, so that the emulsion is more easily flowed onto the filter plate 61, and at the same time, the splashing of the emulsion on the rotating brush piece 71 is reduced; and in the pre-cleaning station, the second elastic strip 642 (still in the state of upward tilting) blocks the emulsion on the filter plate 61, so that more emulsion needs to be treated by the filter plate 61 before being discharged from the cover gap 64, so that the emulsion is wrapped by the brush piece 71 and pre-cleaned on the sheet strip 31.

[0049] Further, the side wall of the filter cover 6 is provided with symmetrically arranged shaft holes 65, the shaft holes 65 movably have shafts 7, the brush piece 71 is fixedly sleeved on the side wall of the shaft 7, and a plurality of nylon brush filaments are fixedly installed on the brush piece 71 and are in contact with the surface of the sheet strip 31 in the default state.

[0050] The brush filaments on the brush piece 71 form a brushing function on the surface of the sheet strip 31, further improving the cleaning effect on stubborn dirt. During the conveying and running of the sheet strip 31, the brush piece 71 is rotated due to friction, so as to change the contact position of the brush filaments with the sheet strip 31, avoid that some brush filaments are severely worn and invalid, and further ensure the cleaning effect on the sheet strip 31.

[0051] In another embodiment of the present application, the end of the brush piece 71 is fixedly provided with a vane 73 for intermittently knocking the filter plate 61.

[0052] Specifically, the vane 73 is a stainless steel sheet and is circumferentially distributed after welding; the arc top of the vane 73 is circumferentially arranged (the arrangement direction is the same as that of a waterwheel), and the vane 73 overlaps the first elastic strip 622.

[0053] By increasing the amount of alkaline solution sprayed by the spray head 5, the alkaline solution flows through the vane 73 and drives the vane 73 to rotate, so as to make the tangential direction of the brush piece 71 opposite to the conveying direction of the sheet strip 31, so as to increase the friction of the brush filaments on the surface of the sheet strip 31, and further improve the brushing ability of stubborn dirt.

[0054] Secondly, whenever the blade 73 rotates due to friction or liquid flow, the blade 73 will intermittently move the first elastic strip 622, causing the first elastic strip 622 to shake repeatedly and vibrate the lower end surface of the filter plate 61. On the one hand, it can reduce the accumulation of particles in a certain place on the filter plate 61 and cause blockage, thereby ensuring the usability of the filter plate 61; on the other hand, it can use vibration to defoam, and during the defoaming process, some large bubbles that are not easy to break (the oil on the surface of the foam forms a skeleton function, which is not easy to break) are dispersed into small bubbles, which can make the increased small bubbles enhance their ability to adhere to and wrap the particles, making it easier for the particles to be entrained to the upper retention section 610, thereby improving the collection capacity of the particles; finally, defoaming is carried out while continuing to vibrate, so that the particles are concentrated.

[0055] In another embodiment provided by the present invention, a locking member 8 is further provided at the end of the brush member 71 , and the locking member 8 is abutted against any of the bars 621 to lock the brush member 71 .

[0056] Specifically, the locking member 8 made of alloy metal is composed of a support ring 81 and a locking rod 82 . The inner diameter of the support ring 81 matches the outer diameter of the rotating shaft 7 , so that the support ring 81 provides support conditions for the rotating shaft 7 to rotate stably.

[0057] Furthermore, a plurality of locking holes 67 are provided on the side wall of the filter cover 6, and the end of the locking rod 82 is bent and plugged into one of the locking holes 67, and the locking hole 67 is located on the inner side of the bar 621, so that the locking rod 82 maintains contact with the inner side of the bar 621 after being plugged in.

[0058] Furthermore, the end of the rotating shaft 7 is removably mounted with symmetrically arranged blocks 72 using screws, and a hole is formed in the support ring 81 for the blocks 72 to pass through. When installing the locking member 8 on the rotating shaft 7, the support ring 81 is first passed through the blocks 72 and placed on the outside of the rotating shaft 7. A deformable rubber gasket 83 is then placed between the support ring 81 and the blocks 72, maintaining a tight fit while the support ring 81 and the outer wall of the filter housing 6 slide in contact. Therefore, when the rotating shaft 7 deviates axially, the gasket 83 is pressed and deformed (the degree of deformation is less than the elastic limit of the gasket 83), and the reaction force prevents the support ring 81 from slipping.

[0059] By pulling the locking rod 82, the washer 83 is placed under the elastic limit. At this time, the bent section at the end of the locking rod 82 can be pulled out of the locking hole 67, and the rotating shaft 7 is synchronously adjusted to slide in the shaft hole 65 to adjust the distance between the brush member 71 and the thin plate belt 31, that is, to adjust the degree of compression deformation of the brush wire. According to the degree of dirt attached to the thin plate belt 31, the brush wire can be made to contact the surface of the thin plate belt 31 more tightly, thereby increasing the friction during the brushing process and enhancing the cleaning effect.

[0060] Working principle: through the reaction of the alkaline solution sprayed to the surface of the sheet strip 31, the alkaline solution flows downward by itself, and is filtered by the filter plate 61 when reaching the filter cover 6 position, at the same time, the brush 71 driven by the sheet strip 31 mixes the alkaline solution to brush the surface of the sheet strip 31, and then the emulsion after reaction is discharged from the discharge port 66 of the filter cover 6, and the upper retention section 610 and the lower retention section 620 are used to retain the particulate matter in the process to improve the purity of the emulsion, and then the emulsion containing alkaline solution enters the liquid tank frame 9 inclined on both sides of the filter cover 6, and under the action of gravity, the emulsion containing alkaline solution is transported to the surface of the untreated sheet strip 31, so that the residual alkaline solution in the emulsion can pre-clean the surface of the sheet strip 31, and then the filtered emulsion is filtered again through the filter cover 6, so that the emulsion is treated twice and then coated on the surface of the sheet strip 31 by the brush 71. Until the sheet strip 31 reaches the position of the spray head 5 to perform complete cleaning work, the efficient use of alkaline solution is realized, and the cleaning effect of stubborn dirt is also improved.

[0061] Example three A high-strength tin-plated sheet includes a sheet strip 31 obtained by the preparation process of the high-strength tin-plated sheet, the sheet strip 31 includes a base plate layer 311, the outer side of the base plate layer 311 is plated with a tin layer 312, the surface of the tin layer 312 is passivated, the outer side of the tin layer 312 is provided with an alloy layer 313 composed of copper, silver and tin, the outer side of the alloy layer 313 is provided with a protective layer 314 composed of a fluorocarbon coating (Teflon, FEVE fluorocarbon resin) and perfluoro ether, and the outer side of the protective layer 314 is provided with an enhanced layer 315 composed of silica and titanium dioxide particles added to the oil film.

[0062] The above only describes some exemplary embodiments of the application by way of illustration, and it is needless to say that those skilled in the art can modify the described embodiments in various ways without departing from the spirit and scope of the application. Therefore, the above drawings and descriptions are illustrative in nature and should not be understood as limiting the scope of protection of the claims of the application.

Claims

1. A process for preparing high-strength tin-plated sheet, characterized in that: The following steps are involved: S1. Smelting raw materials to obtain continuous casting billets, hot rolling and cold rolling the continuous casting billets in sequence to obtain strip steel, and then annealing to eliminate stress and softening of the strip steel; S2, pickling the strip to remove the oxide scale, and then electrolytically cleaning to clean and remove oil; S3, using a slitting machine to cut the strip into the required number of strips, and obtain a thin strip (31); S4, cleaning and degreasing the thin plate strip (31) with an alkaline solution to remove residual oil and fat on the surface; S5, the cleaned thin plate strip (31) is continuously fed into the electroplating bath for tin electroplating, and then the alloy material is plated; S6, immersing the plated thin strip (31) in a chromate solution for passivation, and then applying lubricating oil and protective material; S7, rolling the coated thin plate strip (31) using a leveling mill to eliminate the waviness of the plate surface and improve the surface gloss of the thin plate strip (31); At least one of the steps includes a degreasing device (1) for cleaning the grease on the surface of the thin plate strip (31) in step S4, wherein the degreasing device (1) includes: A spray hood (2) for conveying a running thin plate strip (31); Nozzles (5) are symmetrically distributed on both end surfaces of the thin plate strip (31); A filter cover (6) is located below the nozzle (5) and is used to receive and filter the emulsion flowing downward from the end surface of the thin plate belt (31); A liquid tank frame (9) is used to convey the emulsion containing the alkaline solution after filtering by the filter cover (6) to the front of the thin plate belt (31); It also includes a brush member (71) that is arranged at the end of the filter cover (6) and is driven to rotate, and the brush member (71) maintains contact with the end surface of the thin plate belt (31).

2. The process for preparing high-strength tinplate according to claim 1, characterized in that: A carrier frame (41) and a bracket (42) for supporting the filter cover (6) at a predetermined inclination angle are fixedly installed in the spray cover (2).

3. The process for preparing high-strength tinplate according to claim 1, characterized in that: A filter plate (61) is fixedly mounted in the filter housing (6) and forms an upper retention section (610) with the inner wall.

4. The process for preparing high-strength tin-plated sheet according to claim 3, characterized in that: It also includes a baffle (62) arranged parallel to the filter plate (61), the baffle (62) is provided with through holes (623) arranged at equal intervals, and a baffle (621) for blocking the emulsion delivery is fixedly installed at the end of the through hole (623).

5. The process for preparing high-strength tinplate according to claim 1, characterized in that: A shielding plate (63) is also fixedly mounted in the filter cover (6), and a platform opening (631) for the drainage nozzle (5) to spray the alkaline solution is fixedly mounted on the shielding plate (63).

6. The process for preparing high-strength tinplate according to claim 1, characterized in that: A blade (73) for intermittently striking the filter plate (61) is fixedly mounted on the end of the brush member (71).

7. The process for preparing high-strength tinplate according to claim 4, characterized in that: It also includes a locking member (8) arranged at the end of the brush member (71), wherein the locking member (8) is fixed to any one of the bars (621) to lock the brush member (71).

8. A high-strength tinplate, comprising a thin plate strip (31) obtained by applying the high-strength tinplate preparation process according to any one of claims 1 to 7, characterized in that: The thin plate strip (31) comprises a substrate layer (311), the outer side of the substrate layer (311) is plated with a tin layer (312), and the surface of the tin layer (312) is passivated, an alloy layer (313) is provided on the outer side of the tin layer (312), a protective layer (314) is provided on the outer side of the alloy layer (313), and a reinforcement layer (315) is provided on the outer side of the protective layer (314).

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