Tinplate for food cans and process for its production

Abstract

This invention belongs to the field of food can manufacturing technology, and provides a tin-plated sheet for food cans and its manufacturing process, including the following steps: S100: The tin-plated sheet, which has undergone upstream substrate preparation, mid-term substrate electroplating, and post-substrate defect detection, is introduced into a cleaning assembly. Under the action of a spring, rubber rings located on the upper and lower sides of the tin-plated sheet abut against the surface of the tin-plated sheet. A nylon soft-bristle brush roller, in conjunction with a collection pipe, performs negative pressure dust suction to remove floating dust, powder, and impurities from the surface of the tin-plated sheet in advance, ensuring that the sheet surface is clean before oiling and degreasing, without large particles scratching the sheet surface. This is a prerequisite for rust prevention and sheet surface quality, and can improve the final quality of the food can product. Subsequently, during the off-season, the tin-plated sheet is coated with anti-rust oil to meet the needs of long-term storage, and during the peak season, degreasing is performed to meet the immediate use needs of customers, adapting to the manufacturer's production capacity fluctuations and benefiting market competitiveness.

Description

Technical Field

[0001] This invention relates to the field of food can manufacturing technology, and specifically to a tin-plated sheet processing equipment, and a tin-plated sheet for food cans and its manufacturing process. Background Technology

[0002] Tinplate is a composite material made of cold-rolled low-carbon thin steel sheet with a tin-plated surface. It combines the strength of steel with the non-toxic and corrosion-resistant properties of tin and is a core packaging material for food cans. Its quality directly affects food storage safety, can-making efficiency, and the compliance of downstream industries. Currently, the production process of food-grade tinplate generally includes three steps: initial substrate preparation, intermediate substrate electroplating with tin, and final substrate defect detection.

[0003] With the development of the food industry and fluctuations in manufacturers' production capacity, tinplate needs to be coated with oil for long-term storage. Before transportation, it is also necessary to adapt to customer needs and provide options for delivery with or without oil, so that customers can use it directly or continue to store it. This places clear requirements on the oiling and degreasing processes of tinplate. At the same time, the product must meet basic corrosion resistance and food safety standards and be suitable for can manufacturing.

[0004] Currently, the domestic tinplate industry has achieved large-scale production, with mainstream processes including cold rolling of substrates, degreasing, electroplating, passivation, and oiling. However, existing processes have core pain points, making it difficult to adapt to the differentiated oiling / degreasing needs during storage and transportation when manufacturers' production capacity fluctuates. This is mainly reflected in the following aspects: the existing oiling process for tinplate is unreasonable. Excessive oiling increases the degreasing cost for customers, while insufficient oiling fails to achieve long-term rust prevention during overcapacity, easily leading to tin layer corrosion and substrate rusting during storage or transportation, posing a risk of food contamination. At the same time, the production process is fixed and lacks flexibility, making it difficult to flexibly switch between degreasing and oiled delivery modes according to customer needs, and failing to balance the manufacturer's storage needs with the customer's ease of use.

[0005] In summary, the existing tin-plated sheets for food cans and their production processes cannot meet the differentiated oiling / degreasing requirements of manufacturers for storage and customers for transportation, and there are obvious technical shortcomings. Summary of the Invention

[0006] The purpose of this invention is to provide a tin-plated sheet for food cans and its manufacturing process, thereby solving the technical problem that the existing tin-plated sheet manufacturing process cannot meet the different requirements of manufacturers for oiling and degreasing during storage and customer transportation.

[0007] To achieve the above objectives, the present invention adopts the following technical solution: A process for producing tin-plated sheet for food cans includes the following steps: S100: The tin-plated sheet, which has undergone the upstream substrate preparation, mid-term substrate tin plating and post-substrate defect detection steps, is introduced into the cleaning component. Under the action of the spring, the rubber rings located on the upper and lower sides of the tin-plated sheet abut against the surface of the tin-plated sheet. During the movement of the tin-plated sheet, the rubber rings drive the nylon soft brush roller to rotate by friction, sweeping the impurities on the upper and lower surfaces of the tin-plated sheet towards the collection tube. The negative pressure generated in the collection tube is used to suck away the impurities. S200: The cleaned tin-plated sheet enters the degreasing or oiling assembly. The motor drives the oil pipe to rotate through the central shaft of the oil pipe, and the oil pipe then drives the sponge layer to rotate, continuously rubbing against the tin-plated sheet. At this time, if the tin-plated sheet enters the degreasing assembly, it will generate negative pressure into the oil pipe through the second manifold. The valve plate in the one-way valve will be forced to open and will generate suction on the outer sponge layer through the through hole, so that the rust-preventive oil adsorbed in the sponge layer will be concentrated and temporarily stored in the oil pipe, providing the sponge layer with the ability to continuously adsorb rust-preventive oil. If the tin-plated sheet enters the oiling assembly, rust-preventive oil is added to the oil pipe through the first manifold. Under its own gravity, the rust-preventive oil automatically seeps into the sponge layer from the bottom through hole, providing sufficient rust-preventive oil to the sponge layer. S300: The degreased or oiled tinplate is wound up using a rear take-up roller, and the tinplate for food cans is completed.

[0008] The above technical solution further includes: In step S100, the nylon soft bristle brush roller sweeps impurities into the semi-enclosed space formed by the upper or lower baffle, the tin-plated sheet, the collection tube, and the nylon soft bristle brush roller, and uses the collection tube to suck them up for cleaning; in step S100, the nylon soft bristle brush roller located below the tin-plated sheet sweeps impurities onto the lower baffle, so that the impurities are sucked into the collection tube from the cut.

[0009] In step S200, when the tinplate performs the degreasing action, the SC telescopic cylinder moves the movable bearing seat in the oiling assembly upward. When the movable bearing seat moves upward, it carries the limit roller upward and generates an upward thrust on the tinplate, forcing the lower surface of the tinplate to lose contact with the sponge layer on the fixed bearing seat. Conversely, when the tinplate performs the oiling action, it separates the tinplate from the upper and lower sponge layers in the degreasing assembly.

[0010] The cleaning assembly includes shafts located on the upper and lower sides of the tin-plated sheet; a hollow nylon soft-bristle brush roller is sleeved on the shaft, and the nylon soft-bristle brush roller is rotatably connected to the shaft via a bearing. When the two nylon soft-bristle brush rollers rotate, they clean the impurities on the surface of the tin-plated sheet and throw them forward; an annular limiting block is fixed to the middle of the outer surface of the nylon soft-bristle brush roller, and a rubber ring is embedded inside the limiting block. The friction between the tin-plated sheet and the rubber ring is used to make the nylon soft-bristle brush roller rotate when the tin-plated sheet moves.

[0011] The shaft is fixed at both ends by support rods and has a fixed frame; symmetrical sliders are slidably arranged inside the fixed frame and the sliders are connected to the corresponding shafts; the fixed frame is also equipped with a spring, and the spring applies a force to the slider, causing the shafts to tend to move closer to each other.

[0012] Each fixed frame is equipped with a movable frame on its front side; each fixed frame has a through slot corresponding to the position in front of the slider; the movable frame and the slider are connected by a connecting block that slides in the through slot, so that the movable frame moves synchronously with the slider; shaft tubes are fixedly connected between the movable frames above the tin-plated sheet and between the movable frames below the tin-plated sheet; a tapered collection tube is fixedly connected to the shaft tube, the collection tube is interconnected with the internal space of the shaft tube, and the end of the collection tube near the tin-plated sheet is open and facing the tin-plated sheet; a dust suction tube is connected to the same side port of the two shaft tubes via a flexible hose.

[0013] An upper baffle is fixed to the shaft tube located above the tin-plated sheet, and a lower baffle is fixed to the shaft tube located below the tin-plated sheet. Both the upper and lower baffles are inclined upwards and form a semi-closed chamber with the collecting tube, the tin-plated sheet, and the nylon soft brush roller. A cut is provided at the connection between the lower shaft tube and the lower baffle.

[0014] The degreasing assembly and the oiling assembly include a roller seat; a fixed bearing seat is fixedly connected to the upper part of the roller seat; a movable bearing seat is arranged above the fixed bearing seat, and the fixed bearing seat and the movable bearing seat are located on the upper and lower sides of the tin-plated sheet respectively; symmetrically arranged SC telescopic cylinders are fixedly arranged on both sides of the roller seat, and the output end of the SC telescopic cylinder passes through the fixed bearing seat and is connected to the movable bearing seat; an oil pipe is rotatably connected between the fixed bearing seats; a sponge layer is sleeved on the oil pipe; a circular array of through holes is opened along the axial direction on the oil pipe; one end of the central axis of the oil pipe is open and communicates with the interior of the oil pipe, and this end is connected to a rotary joint; a screw is fixedly connected to the front side of the movable bearing seat; a limit bearing seat is fixedly connected to the screw; a limit roller is rotatably connected between the limit bearing seats.

[0015] A second manifold is connected to the rotary joint in the degreasing assembly, and a first manifold is connected to the rotary joint in the oiling assembly. Both the first and second manifolds are connected to the corresponding rotary joints via expansion joints. The second manifold provides suction to the sponge layer through the through hole using negative pressure, thereby drawing the rust-preventive oil collected in the sponge layer into the oil pipe. A one-way valve is also installed on the through hole in the degreasing assembly. The first manifold is used to input rust-preventive oil into the oil pipe, allowing the rust-preventive oil to automatically diffuse into the sponge through the through hole.

[0016] The beneficial effects of this invention are: 1. This invention utilizes symmetrically arranged nylon soft-bristle brush rollers, combined with a collection pipe, to perform negative pressure dust extraction. This effectively removes floating dust, powder, and impurities from the surface of the tin-plated sheet in advance, ensuring a clean surface before oiling and degreasing. The absence of large particles that could scratch the surface provides a crucial guarantee for rust prevention and sheet quality, ultimately improving the quality of the final food can product. Subsequently, during the off-season, the tin-plated sheet is coated with rust-preventive oil to meet long-term storage requirements, while during peak season, degreasing is performed to meet immediate customer needs. This adapts to fluctuations in manufacturer production capacity and is beneficial for market competitiveness.

[0017] 2. Because the degreasing component and the oiling component of this invention have highly homogeneous structures, their operation, maintenance and production difficulty are reduced, and the usage cost is low, which can meet the low-cost usage needs of enterprises and customers. Attached Figure Description

[0018] Figure 1 This is a schematic diagram of the overall structure of the present invention; Figure 2 yes Figure 1 A magnified view of a section at point A in the middle; Figure 3 This is a cross-sectional view of the collection tube in this invention; Figure 4 This is a cross-sectional view of the degreasing component and the oiling component in this invention; Figure 5 This is a cross-sectional view of the fixing frame in this invention; Figure 6 This is a cross-sectional view of the oil removal component in this invention; Figure 7 This is a schematic diagram of the limiting roller in this invention.

[0019] In the diagram: 101, shaft; 102, nylon soft brush roller; 103, fixing frame; 104, slider; 105, spring; 106, limiting block; 107, rubber ring; 111, moving frame; 112, shaft tube; 113, collection tube; 114, lower baffle; 115, upper baffle; 116, through groove; 117, connecting block; 118, cut; 119, suction pipe; 201. Roller seat; 202. Moving bearing seat; 203. Fixed bearing seat; 204. SC telescopic cylinder; 205. Oil pipe; 206. Sponge layer; 207. Through hole; 208. Rotary joint; 209. Telescopic joint pipe; 210. First manifold; 211. Second manifold; 212. One-way valve; 221. Limit bearing seat; 222. Screw; 223. Limit roller. Detailed Implementation

[0020] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0021] Please see Figure 1 As shown, a tin-plated sheet for food cans and its manufacturing process include a cleaning component, an oil removal component, and an oiling component arranged sequentially between an unwinding device (or a later substrate defect detection device) and a rewinding device. The cleaning component is used to remove impurities from the surface of the tin-plated sheet, and the oil removal component and the oiling component are used interchangeably to remove oil from the sheet surface and apply oil to the sheet surface, respectively.

[0022] The unwinding equipment (or subsequent substrate defect detection) and the winding equipment are known existing technologies, and will not be elaborated on here.

[0023] Please refer to it again. Figure 3 and Figure 5 As shown, the unwinding device includes shafts 101 located on the upper and lower sides of the tin-plated sheet; a hollow nylon soft-bristle brush roller 102 is sleeved on the shaft 101, and the nylon soft-bristle brush roller 102 is rotatably connected to the shaft 101 via a bearing. When the two nylon soft-bristle brush rollers 102 rotate, they clean the impurities on the surface of the tin-plated sheet and throw them forward.

[0024] Please refer to it again. Figure 2 As shown, a ring-shaped limiting block 106 is fixedly connected to the middle of the outer surface of the nylon soft brush roller 102, and a rubber ring 107 is embedded inside the limiting block 106. During operation, the friction between the tin-plated sheet and the rubber ring 107 is used to make the tin-plated sheet move and drive the nylon soft brush roller 102 to rotate, thereby realizing the rotation capability of the nylon soft brush roller 102.

[0025] Please refer to it again. Figure 5 As shown, further, the two ends of the shaft 101 are fixed with a fixing frame 103 via support rods; symmetrical upper and lower sliders 104 are slidably arranged inside the fixing frame 103, and the sliders 104 are connected to the corresponding shafts 101; a spring 105 is also provided inside the fixing frame 103, and the spring 105 applies a force to the sliders 104, causing the shafts 101 to tend to move closer to each other. During operation, the spring 105, in conjunction with the sliders 104, causes the rubber rings 107 on the nylon soft brush tube to abut against the upper and lower surfaces of the tin-plated sheet respectively. This not only automatically adapts to different thicknesses of the tin-plated sheet, but also ensures that sufficient friction is generated between the rubber rings 107 and the tin-plated sheet to drive the nylon soft brush roller 102 to rotate, thereby ensuring the cleaning effect.

[0026] Please refer to it again. Figure 3 As shown, each of the fixed frames 103 has a movable frame 111 on its front side; each fixed frame 103 has a through groove 116 at a position corresponding to the front side of the slider 104; the movable frame 111 and the slider 104 are connected by a connecting block 117 that slides within the through groove 116, allowing the movable frame 111 to move synchronously with the slider 104; shaft tubes 112 are fixedly connected between the movable frames 111 above the tin-plated sheet and between the movable frames 111 below the tin-plated sheet; a tapered collection tube 113 is fixedly connected to the shaft tube 112, and the collection tube 113 is open at the end near the tin-plated sheet and is positioned directly facing the tin-plated sheet, allowing it to absorb impurities from the surface of the tin-plated sheet and improve the cleaning effect. Since the movable frame 111 moves synchronously with the slider 104, the port of the collection tube 113 is always at the optimal adsorption distance to complete the cleaning of impurities from the surface of the dust-laden tin-plated sheet. A suction pipe 119 is connected to the same side port of the two shaft tubes 112 via a flexible hose. The suction pipe 119 provides suction to the collection pipe 113 to remove impurities from the surface of the tin-plated sheet.

[0027] Based on this, an upper baffle 115 is fixedly connected to the shaft tube 112 above the tin-plated sheet, and a lower baffle 114 is fixedly connected to the shaft tube 112 below the tin-plated sheet. Both the upper baffle 115 and the lower baffle 114 are inclined upwards and form a semi-closed chamber with the collection tube 113, the tin-plated sheet, and the nylon soft-bristle brush roller 102. This allows the nylon soft-bristle brush roller 102 to throw the swept impurities towards the collection tube 113 for collection. A slit 118 is provided at the connection between the lower shaft tube 112 and the lower baffle 114. After the nylon soft-bristle brush roller 102 throws the impurities onto the lower baffle 114, they are automatically sucked into the shaft tube 112 for direct collection.

[0028] Please refer to it again. Figure 4 As shown, the degreasing assembly and the oiling assembly have basically the same structure, including a roller seat 201; a fixed bearing seat 203 is fixedly connected to the upper part of the roller seat 201; a movable bearing seat 202 is provided above the fixed bearing seat 203, and the fixed bearing seat 203 and the movable bearing seat 202 are located on the upper and lower sides of the tin-plated sheet respectively; symmetrically arranged SC telescopic cylinders 204 (with adjustable telescopic stroke) are fixedly provided on both sides of the roller seat 201. The output end of the SC telescopic cylinder 204 passes through the fixed bearing seat 203 and is connected to the movable bearing seat 202 through the cooperation of a nut and a shaft ridge, and is used to adjust the relative position between the fixed bearing seat 203 and the movable bearing seat 202.

[0029] Please refer to it again. Figure 7As shown, furthermore, to ensure that the tin-plated sheet loses its contact with the fixed bearing seat 203 when the movable bearing seat 202 moves upward, a screw 222 is fixedly connected to the front side of the movable bearing seat 202; a limiting bearing seat 221 is fixedly connected to the screw 222; and a limiting roller 223 is rotatably connected between the limiting bearing seats 221. During operation, as the movable bearing seat 202 moves upward, it drives the limiting roller 223 to move upward synchronously, thereby lifting the tin-plated sheet upward and preventing it from contacting the fixed bearing seat 203.

[0030] Please refer to it again. Figure 6 As shown, the degreasing assembly and the oiling assembly also include an oil pipe 205 rotatably connected between the fixed bearing housing 203; a sponge layer 206 is sleeved on the oil pipe 205; through holes 207 arranged in a circular array are opened along the axial direction on the oil pipe 205; one end of the central axis of the oil pipe 205 is open and communicates with the interior of the oil pipe 205, and a rotary joint 208 is connected to this end.

[0031] Please refer to it again. Figure 4 As shown, the difference between the degreasing assembly and the oiling assembly is that the rotary joint 208 in the degreasing assembly is connected to a second manifold 211, while the rotary joint 208 in the oiling assembly is connected to a first manifold 210. Both the first manifold 210 and the second manifold 211 are connected to their respective rotary joints 208 via expansion joints 209 to prevent movement interference between the movable fixed seat and the pipeline. The second manifold 211 generates negative pressure, which provides suction to the sponge layer 206 from the through-hole 207, thereby drawing the rust-preventive oil collected in the sponge layer 206 into the oil pipe 205. The first manifold 210 introduces rust-preventive oil into the oil pipe 205, allowing it to automatically diffuse into the sponge through the through-hole 207. A one-way valve 212 is also installed on the through-hole 207 in the degreasing assembly to prevent the rust-preventive oil from re-entering the sponge layer 206 when the negative pressure in the oil pipe 205 disappears.

[0032] It is worth noting that the distance between the sponge layer 206 above the tinplate and the sponge layer 206 below the tinplate is less than the thickness of the tinplate. When the tinplate passes through the sponge layer 206, it causes the sponge layer 206 to deform, which also produces a degreasing or oiling effect on the side of the tinplate, achieving all-round degreasing.

[0033] It should also be noted that by retaining a small amount of uniform anti-rust oil film on the tin-plated sheet, the cleanliness requirements for direct use by customers can be met in a short time, and the sheet can continue to play a role in rust prevention, lubrication and protection during transportation, storage and can manufacturing. This is more in line with actual production needs. Therefore, in this embodiment, no cleaning mechanism is set in the degreasing component, which aims to absorb the excess anti-rust oil on the surface of the tin-plated sheet, leaving a small amount of uniform anti-rust oil film to meet the actual needs of customers.

[0034] Please refer to it again. Figure 1 As shown, the present invention provides a tin-plated sheet for food cans and its manufacturing process, which includes the following steps in specific operation: S100: The tin-plated sheet, which has undergone the upstream substrate preparation, intermediate substrate tin plating, and post-substrate defect detection steps, is introduced into the cleaning assembly. Under the action of the spring 105, the rubber rings 107 located on the upper and lower sides of the tin-plated sheet abut against the surface of the tin-plated sheet. During the movement of the tin-plated sheet, the rubber rings 107 drive the nylon soft brush roller 102 to rotate by friction, sweeping the impurities on the upper and lower surfaces of the tin-plated sheet toward the collection tube 113. The negative pressure generated in the collection tube 113 is used to suck away the impurities, achieving the cleaning effect.

[0035] The nylon soft brush roller 102 sweeps impurities into the semi-enclosed space formed by the upper baffle 115 or lower baffle 114, the tin-plated sheet, the collection pipe 113, and the nylon soft brush roller 102. The collection pipe 113 is used to absorb and clean the impurities, preventing them from scattering everywhere and improving the cleaning effect.

[0036] The nylon soft brush roller 102 located below the tin-plated sheet sweeps impurities onto the lower baffle 114, allowing the impurities to be sucked into the collection tube 113 from the cut 118, thus preventing impurities from accumulating on the lower baffle 114.

[0037] S200: The cleaned tin-plated sheet enters the degreasing assembly or oiling assembly. The motor drives the oil pipe 205 to rotate through the central shaft of the oil pipe 205. The oil pipe 205 then drives the sponge layer 206 to rotate, continuously rubbing against the tin-plated sheet. At this time, if the tin-plated sheet enters the degreasing assembly, a negative pressure is generated in the oil pipe 205 through the second manifold 211. The valve plate in the one-way valve 212 is forced to open, and a suction force is generated on the outer sponge layer 206 through the through hole 207. This causes the rust-preventive oil adsorbed in the sponge layer 206 to be concentrated and temporarily stored inside the oil pipe 205, providing the sponge layer 206 with the ability to continuously adsorb rust-preventive oil. Therefore, the rust-preventive oil can be absorbed when the sponge layer 206 contacts the tin-plated sheet. If the tin-plated sheet enters the oiling assembly, rust-preventive oil is added to the oil pipe 205 through the first manifold 210. Under its own gravity, the rust-preventive oil automatically seeps into the sponge layer 206 from the bottom through hole 207, providing sufficient rust-preventive oil to the sponge layer 206. Therefore, when the sponge layer 206 contacts the tin-plated sheet, the rust-preventive oil can be applied to the tin-plated sheet.

[0038] When the tinplate is degreasing, the SC telescopic cylinder 204 moves the movable bearing seat 202 in the oiling assembly upward. As the movable bearing seat 202 moves upward, it carries the limiting roller 223 upward, generating an upward thrust on the tinplate, forcing the lower surface of the tinplate to lose contact with the sponge layer 206 on the fixed bearing seat 203. Conversely, when the tinplate is oiling, it separates from the upper and lower sponge layers 206 in the degreasing assembly.

[0039] S300: The degreased or oiled tinplate is wound up using a rear take-up roller, and the tinplate for food cans is completed.

[0040] In this embodiment, symmetrically arranged nylon soft-bristle brush rollers 102, in conjunction with the collection pipe 113, perform negative pressure dust extraction to remove floating dust, powder, and impurities from the surface of the tin-plated sheet in advance. This ensures a clean surface before oiling and degreasing, free from large particles that could scratch the surface. This is a prerequisite for ensuring rust prevention and sheet quality, ultimately improving the quality of the final food can product. Subsequently, during the off-season, the tin-plated sheet is coated with rust-preventive oil to meet long-term storage requirements, while during peak season, degreasing is performed to meet customers' immediate needs. This adapts to fluctuations in the manufacturer's production capacity and is beneficial for market competitiveness.

[0041] In this embodiment, since the degreasing component and the oiling component have highly homogeneous structures, their operation, maintenance and production difficulty are reduced, and the usage cost is not high, which can meet the low-cost usage needs of enterprises and customers.

[0042] It should be noted that, in this document, terms such as “comprising,” “including,” or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such process, method, article, or apparatus.

[0043] Although embodiments of the invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the invention.

Claims

1. A process for producing tin-plated sheet for food cans, characterized in that: Includes the following steps: S100: The tin-plated sheet that has undergone the upstream substrate preparation, intermediate substrate tin plating and post-substrate defect detection steps is introduced into the cleaning component. Under the action of the spring (105), the rubber rings (107) located on the upper and lower sides of the tin-plated sheet abut against the surface of the tin-plated sheet. During the movement of the tin-plated sheet, the rubber rings (107) drive the nylon soft brush roller (102) to rotate by friction, sweeping the impurities on the upper and lower surfaces of the tin-plated sheet towards the collection tube (113). The impurities are sucked away by the negative pressure generated in the collection tube (113). S200: The cleaned tin-plated sheet enters the degreasing assembly or oiling assembly. The motor drives the oil pipe (205) to rotate through the central shaft of the oil pipe (205). The oil pipe (205) then drives the sponge layer (206) to rotate, continuously rubbing against the tin-plated sheet. At this time, if the tin-plated sheet enters the degreasing assembly, it generates negative pressure in the oil pipe (205) through the second manifold (211). The valve plate in the one-way valve (212) is forced to open, and it generates suction on the outer sponge layer (206) through the through hole (207). This causes the rust-preventive oil adsorbed in the sponge layer (206) to concentrate and enter the oil pipe (205) for temporary storage, providing the sponge layer (206) with the ability to continuously adsorb rust-preventive oil. If the tin-plated sheet enters the oiling assembly, rust-preventive oil is added to the oil pipe (205) through the first manifold (210). Under its own gravity, the rust-preventive oil automatically seeps into the sponge layer (206) from the bottom through hole (207), providing sufficient rust-preventive oil for the sponge layer (206). S300: The degreased or oiled tinplate is wound up using a rear take-up roller, and the tinplate for food cans is completed.

2. The manufacturing process for tin-plated sheet for food cans according to claim 1, characterized in that: In step S100, the nylon soft brush roller (102) sweeps the impurities into the semi-enclosed space formed by the upper baffle (115) or lower baffle (114), the tin-plated sheet, the collection tube (113), and the nylon soft brush roller (102), and uses the collection tube (113) to absorb and clean them. In step S100, the nylon soft brush roller (102) located below the tin-plated sheet sweeps the impurities onto the lower baffle (114), so that the impurities are sucked into the collection tube (113) from the cut (118).

3. The process for producing tin-plated sheet for food cans according to claim 1, characterized in that: In step S200, when the tinplate performs the degreasing action, the SC telescopic cylinder (204) moves the movable bearing seat (202) in the oiling assembly upward. When the movable bearing seat (202) moves upward, it carries the limiting roller (223) upward and generates an upward thrust on the tinplate, forcing the lower surface of the tinplate to lose contact with the sponge layer (206) on the fixed bearing seat (203); conversely, when the tinplate performs the oiling action, it separates the tinplate from the upper and lower sponge layers (206) in the degreasing assembly.

4. The manufacturing process for tin-plated sheet for food cans according to claim 1, characterized in that: The cleaning assembly includes shafts (101) located on the upper and lower sides of the tin-plated sheet; a hollow nylon soft-bristle brush roller (102) is sleeved on the shaft (101), and the nylon soft-bristle brush roller (102) is rotatably connected to the shaft (101) via a bearing. When the two nylon soft-bristle brush rollers (102) rotate, they clean the impurities on the surface of the tin-plated sheet and throw them forward. A ring-shaped limiting block (106) is fixed to the middle of the outer surface of the nylon soft brush roller (102). A rubber ring (107) is embedded inside the limiting block (106). The friction between the tin-plated sheet and the rubber ring (107) is used to make the tin-plated sheet move and drive the nylon soft brush roller (102) to rotate.

5. The manufacturing process for tin-plated sheet for food cans according to claim 4, characterized in that: The shaft (101) is fixed at both ends by support rods and has a fixed frame (103); the fixed frame (103) has a sliding block (104) symmetrically arranged in the upper and lower parts, and the block (104) is connected to the corresponding shaft (101); the fixed frame (103) is also provided with a spring (105), and the spring (105) applies a force to the block (104) to make the shaft (101) tend to move closer to each other.

6. The manufacturing process for tin-plated sheet for food cans according to claim 5, characterized in that: Each of the fixed frames (103) is provided with a movable frame (111) on its front side; each of the fixed frames (103) is provided with a through groove (116) corresponding to the position on the front side of the slider (104); the movable frame (111) and the slider (104) are connected by a connecting block (117) that slides in the through groove (116), so that the movable frame (111) moves synchronously with the slider (104); the movable frames (111) above the tin-plated sheet and the movable frames (111) below the tin-plated sheet are fixedly connected with shaft tubes (112); a tapered collection tube (113) is fixedly connected to the shaft tube (112), the collection tube (113) is connected to the internal space of the shaft tube (112), and the end of the collection tube (113) near the tin-plated sheet is open and facing the tin-plated sheet; a vacuum tube (119) is connected to the same side port of the two shaft tubes (112) via a flexible hose.

7. The manufacturing process for tin-plated sheet for food cans according to claim 6, characterized in that: An upper baffle (115) is fixedly connected to the shaft tube (112) located above the tin-plated sheet, and a lower baffle (114) is fixedly connected to the shaft tube (112) located below the tin-plated sheet. Both the upper baffle (115) and the lower baffle (114) are inclined upwards and form a semi-closed chamber with the collecting tube (113), the tin-plated sheet and the nylon soft brush roller (102). A cut (118) is provided at the connection between the lower shaft tube (112) and the lower baffle (114).

8. The manufacturing process for tin-plated sheet for food cans according to claim 1, characterized in that: The degreasing assembly and the oiling assembly include a roller seat (201); a fixed bearing seat (203) is fixedly connected to the upper part of the roller seat (201); a movable bearing seat (202) is provided above the fixed bearing seat (203), and the fixed bearing seat (203) and the movable bearing seat (202) are located on the upper and lower sides of the tin-plated sheet respectively; symmetrically arranged SC telescopic cylinders (204) are fixedly provided on both sides of the roller seat (201), and the output end of the SC telescopic cylinder (204) passes through the fixed bearing seat (203) and is connected to the movable bearing seat (202); The fixed bearing housing (203) is rotatably connected by an oil pipe (205); a sponge layer (206) is sleeved on the oil pipe (205); the oil pipe (205) is provided with a circumferential array of through holes (207) along the axial direction; one end of the central axis of the oil pipe (205) is open and connected to the inside of the oil pipe (205), and this end is connected to a rotary joint (208). A screw (222) is fixedly connected to the front side of the movable bearing seat (202); a limit bearing seat (221) is fixedly connected to the screw (222); and a limit roller (223) is rotatably connected between the limit bearing seats (221).

9. The manufacturing process for tin-plated sheet for food cans according to claim 8, characterized in that: A second manifold (211) is connected to the rotary joint (208) in the degreasing assembly, and a first manifold (210) is connected to the rotary joint (208) in the oiling assembly. Both the first manifold (210) and the second manifold (211) are connected to the corresponding rotary joint (208) via a telescopic joint pipe (209). The second manifold (211) provides suction to the sponge layer (206) through the through hole (207) by negative pressure, thereby drawing the rust-preventive oil collected in the sponge layer (206) into the oil pipe (205). A one-way valve (212) is also installed on the through hole (207) in the degreasing assembly. The first manifold (210) is used to input rust-preventive oil into the oil pipe (205), so that the rust-preventive oil can automatically diffuse into the sponge through the through hole (207).

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