A spraying device and method for leather processing

Abstract

The present application relates to leather spraying processing technical field, specifically is a kind of spraying device and method for leather processing, including rack, reciprocating spraying spraying assembly is arranged on the rack, conveying mechanism for conveying leather is arranged on the rack, while the auxiliary flattening of leather is carried out to the conveying mechanism, leveling mechanism for leveling conveying mechanism is further arranged on the rack, the distribution spacing of each steel wire rope is adjusted in advance by the rotating wheel assembly of the present application, realize that steel wire rope is closely arranged in the position close to feeding place, steel wire rope is sparsely arranged in the position close to discharge place, because the pulling force of gradually separating of leather two sides is generated by the change of steel wire rope spacing from dense to sparse, effective flattening force is exerted to leather, thereby automatically eliminating the curl and wrinkle on the surface of leather, significantly improve the flatness of leather before spraying;At the same time, the steel wire rope is pressed by two rope pressing rollers, effectively ensure that the conveying plane of spraying area is always flat and consistent.

Description

Technical Field

[0001] This invention relates to the field of leather spraying technology, specifically to a spraying apparatus and method for leather processing. Background Technology

[0002] Spraying equipment is a key piece of equipment in the leather finishing process, and is widely used for surface coloring and finishing of various leather products such as sofa leather, shoe upper leather, clothing leather and bag leather.

[0003] Existing leather processing spraying equipment typically includes a frame, conveying mechanism, spraying chamber, feeding system, and control system. Currently, existing spraying equipment generally uses several parallel steel wire ropes as the conveying mechanism.

[0004] In actual spraying operations, the leather is placed manually at the feeding station of the conveying steel wire rope. The rotating steel wire rope transports the leather to the inside of the spraying chamber. When the leather passes under the spray gun, the control system drives the spray gun to reciprocate in a straight line perpendicular to the conveying direction. At the same time, the spray gun is turned on intermittently according to a predetermined sequence to evenly coat the atomized paint onto the surface of the leather.

[0005] The conveyor wire ropes are spaced apart and operate synchronously, utilizing the friction between the wire ropes and the underside of the leather to support and transport the leather. Its open line-contact structure reduces the area of ​​the conveyor components obstructing the back of the leather and facilitates the overspray coating falling through the gaps between the wire ropes into the collection device below. Due to its simple structure, good ventilation, and ease of cleaning, this wire rope conveyor method has become the standard conveyor structure in mainstream leather spraying equipment.

[0006] However, the above-mentioned spraying device using steel wire rope conveying has obvious defects in actual long-term use. First, because the steel wire rope is continuously exposed to the atomized paint environment in the spraying area, and the leather covering the steel wire rope during the conveying process is random, coupled with the fact that the spray gun is turned on intermittently according to the principle of "spraying when there is leather and stopping spraying when there is no leather", the thickness of the paint adhering to the surface of each steel wire rope is extremely uneven.

[0007] In some sections, the steel wire ropes have less coating due to frequent obstruction by the leather, while in other sections, the coating accumulates more due to direct exposure to the spraying path. This dried coating forms local bumps or knots on the surface of the steel wire ropes. As the usage time increases, the differences in diameter and surface morphology between the steel wire ropes intensify, causing the supporting surfaces of the multiple steel wire ropes to no longer be at the same level. The leather, placed on an uneven conveyor surface, experiences localized loosening or twisting, which in turn forms wrinkles during the spraying process.

[0008] Secondly, when dealing with wrinkled leather, existing spraying equipment mainly relies on manual pre-flattening of the leather during loading, lacking automatic flattening measures during the spraying process. Operators need to manually smooth each piece of leather before it enters the conveyor mechanism. Even if it is flattened during loading, new wrinkles may still occur during the conveying process with the wire rope due to vibration or uneven supporting surface, resulting in uneven coating thickness and poor local coverage after spraying, which seriously affects the coating quality and causes paint waste.

[0009] Therefore, it is urgent to improve the structure of the existing wire rope conveyor spraying device to solve the technical problems of inconsistent horizontality of the wire rope support surface and lack of automatic leveling function during the spraying process. Summary of the Invention

[0010] In view of the above problems, embodiments of the present invention provide a spraying apparatus and method for leather processing to solve the aforementioned technical problems.

[0011] To solve the above-mentioned technical problems, the technical solution adopted by the present invention is as follows: The first aspect of the present invention provides a spraying device for leather processing, including a frame, a spraying assembly for reciprocating spraying is provided on the frame, a conveying mechanism for conveying leather is provided on the frame, the conveying mechanism assists in flattening the leather while moving it, and a leveling mechanism for the leveling conveying mechanism is also provided on the frame.

[0012] The conveying mechanism includes two rotating rollers rotatably arranged on the frame. Several steel wire ropes are arranged on the two rotating rollers through a wheel assembly. The steel wire ropes are arranged closely near the feed point and loosely near the discharge point.

[0013] The leveling mechanism includes two rope pressing rollers connected by a connecting component. The two rope pressing rollers press down on the wire rope, so that the wire rope portion between the two rope pressing rollers is arranged horizontally.

[0014] The leveling mechanism also includes a cylindrical scraper arranged by several linkage components. The cylindrical scraper corresponds one-to-one with the steel wire rope, and the cylindrical scraper and the corresponding steel wire rope are arranged coaxially and do not contact each other.

[0015] Preferably, the wheel assembly includes a rope wheel that is axially slidably sleeved on the outside of the rotating roller, with the rope wheels on the two rotating rollers corresponding one to one, and the wire rope wound on the two corresponding rope wheels.

[0016] Preferably, a fastening screw is rotatably provided on the rope wheel, and the rope wheel is pressed against the rotating roller by the fastening screw, so that the rope wheel is locked on the rotating roller.

[0017] Preferably, the connecting assembly includes a lifting frame that slides vertically on the frame, and a hydraulic cylinder is fixedly installed on the frame, with the telescopic section of the hydraulic cylinder fixedly connected to the lifting frame.

[0018] Preferably, the rope pressing rollers are rotatably connected to both sides of the lifting frame, the two rope pressing rollers are arranged horizontally, and a transition cover for covering the rope pressing rollers is fixedly installed on the upper side of the lifting frame.

[0019] Preferably, the linkage component includes two movable seats that are slidably connected to the frame, with an upper rod rotatably mounted on the right movable seat and a lower rod rotatably mounted on the left movable seat.

[0020] Preferably, the upper rod and the lower rod are slidably connected together, the movable seat is rotatably connected to the rope wheel at the corresponding position, and the cylindrical scraper is fixedly connected to the upper rod.

[0021] Preferably, the upper side of the movable seat is provided with two limiting wheels, which are rotatably limited to the edge position of the corresponding rope wheel.

[0022] Preferably, the cylindrical scraper has two U-shaped grooves arranged opposite to each other for fitting the cylindrical scraper onto the outside of the wire rope, and a collection trough is fixedly installed on the frame at the position corresponding to the cylindrical scraper.

[0023] The second aspect of the present invention provides a spraying method for leather processing, comprising the following steps: S1, according to the width of the leather to be sprayed, the distribution spacing of each steel wire rope is adjusted by the rotating wheel assembly to adapt to the width of the leather, and the two pressure rollers are driven downward by the leveling mechanism to press down the steel wire ropes so that the steel wire rope portion between the two pressure rollers is kept horizontally arranged.

[0024] S2. Place the leather to be sprayed at the feed point of the steel wire rope and drive the steel wire rope to rotate. The leather is conveyed forward with the steel wire rope. The loose arrangement of the steel wire rope applies a flattening force to the leather, effectively eliminating curls and wrinkles on the surface of the leather.

[0025] S3. The leather is conveyed flat to the bottom of the spraying assembly. The spraying assembly moves back and forth on the frame to spray the leather surface evenly. After spraying, the leather continues to be conveyed by the wire rope to the discharge point, so that the leather is separated and discharged.

[0026] S4. After the steel wire rope cuts the leather, it rotates to the lower part, causing the steel wire rope to move to the position of the cylindrical scraper, so that the cylindrical scraper can scrape off the excess coating that has passed through the outside of the steel wire rope.

[0027] The beneficial effects of this invention are as follows: First, this invention uses a rotating assembly to pre-adjust the distribution spacing of each steel wire rope, achieving a close arrangement of the steel wire ropes near the feed point and a loose arrangement near the discharge point. As the leather is conveyed forward with the steel wire ropes, the changing spacing between the steel wire ropes gradually generates a pulling force on both sides of the leather, applying an effective flattening force to the leather, thereby automatically eliminating curls and wrinkles on the leather surface and significantly improving the smoothness of the leather before spraying. At the same time, two pressure rollers press down on the steel wire ropes, making the steel wire rope portion between the two pressure rollers horizontally arranged, thereby forcibly confining the supporting surface of each steel wire rope to the same horizontal plane, effectively avoiding wrinkles in the leather during conveying due to uneven coating on the steel wire rope surface, and effectively ensuring that the conveying plane of the spraying area is always flat and consistent.

[0028] Second, this invention uses a linkage component to drive a cylindrical scraper to scrape off excess coating on the wire rope, promptly cleaning the dried coating accumulated on the surface of the wire rope, further preventing local protrusions or knots on the wire rope, thereby maintaining the uniform diameter and smooth surface of each wire rope, and preventing unevenness of the support surface caused by coating accumulation; moreover, the cylindrical scraper is coaxially arranged with the corresponding wire rope and does not contact it, which can effectively scrape off the attached coating, while avoiding mechanical scratches or wear on the wire rope by the cylindrical scraper, thus extending the service life of the wire rope.

[0029] Third, the present invention employs pre-adjustment of the rope wheels on the two rotating rollers, so that the rope wheels on the right rotating roller are arranged closely at equal intervals, and the distribution spacing of the rope wheels on the left rotating roller is adapted to the width of the leather. Thus, when the steel wire rope is conveying the leather, as the leather moves from the feed point to the discharge point, the distance between each steel wire rope gradually increases, thereby generating an outward pulling force on both sides of the leather, and gradually flattening the leather along the width direction.

[0030] Fourth, the present invention uses a hydraulic cylinder to pull the lifting frame downward, so that the lifting frame drives the two horizontally arranged rope pressing rollers on it to move down synchronously and press against the wire rope, so as to realize the horizontal tension arrangement of the wire rope between the two rope pressing rollers. Attached Figure Description

[0031] The present invention will be further described below with reference to the accompanying drawings and embodiments.

[0032] Figure 1 This is a schematic diagram of the overall structure of the present invention;

[0033] Figure 2 This is a partial cross-sectional view of the present invention;

[0034] Figure 3 This is a top view of the rotating roller, wire rope, and rope wheel in this invention;

[0035] Figure 4This is a schematic diagram of the structure of the frame, transition cover, wire rope and lifting frame in this invention;

[0036] Figure 5 This is a partial structural schematic diagram of the rope wheel, wire rope, cylindrical scraper, and collection trough in this invention;

[0037] Figure 6 This is a partial structural diagram of the rope pulley, lower rod, movable seat, and upper rod in this invention;

[0038] Figure 7 This is a schematic diagram of the structure of the cylindrical scraper, upper rod, lower rod and movable seat in this invention;

[0039] Figure 8 This is a partial cross-sectional view of the rope pulley and the movable seat in this invention;

[0040] Figure 9 This is a partial structural diagram of the cylindrical scraper and wire rope in this invention.

[0041] In the diagram: 1. Frame; 2. Spraying assembly; 3. Conveying mechanism; 4. Leveling mechanism; 31. Rotating roller; 32. Rotary wheel assembly; 33. Wire rope; 41. Connecting assembly; 42. Rope pressing roller; 43. Linkage assembly; 44. Cylindrical scraper; 321. Rope wheel; 411. Lifting frame; 412. Hydraulic cylinder; 413. Transition cover; 431. Moving seat; 432. Upper rod; 433. Lower rod; 441. Collection trough. Detailed Implementation

[0042] The embodiments of the present invention are described in detail below. The embodiments described below are exemplary and are only used to explain the present invention, and should not be construed as limiting the present invention. Where specific techniques or conditions are not specified in the embodiments, they shall be performed in accordance with the techniques or conditions described in the literature in the art or in accordance with the product manual.

[0043] See Figure 1 and Figure 2 A leather processing spraying device includes a frame 1, a spraying assembly 2 for reciprocating spraying is provided on the frame 1, a conveying mechanism 3 for conveying leather is provided on the frame 1, the conveying mechanism 3 assists in flattening the leather while moving it, and a leveling mechanism 4 for leveling the conveying mechanism 3 is also provided on the frame 1.

[0044] When spraying leather, the operator lays the leather flat on the upper right side of the conveyor 3 and starts the conveyor 3 to continuously convey the leather to the left. During this process, the conveyor 3 helps to flatten the leather. When the conveyor 3 moves the leather to the lower part of the spraying assembly 2, the spraying assembly 2 is started to spray the leather evenly. Throughout the entire process of starting the conveyor 3, the leveling mechanism 4 adjusts the level of the conveyor 3 to ensure that the leather is flat and wrinkle-free during spraying.

[0045] In this embodiment, the spraying assembly 2 adopts the existing structure of a traditional reciprocating spraying machine, which can automatically identify the position and width of the leather and realize intermittent operation of "spraying when there is leather and stopping spraying when there is no leather".

[0046] See Figure 2 , Figure 3 , Figure 4 and Figure 5 The conveying mechanism 3 includes two rotating rollers 31 rotatably arranged on the frame 1. Several steel wire ropes 33 are arranged on the two rotating rollers 31 through the wheel assembly 32. The steel wire ropes 33 are closely arranged near the feed point and loosely arranged near the discharge point.

[0047] When spraying leather, the two rotating rollers 31 rotate synchronously at a slow speed, so that the two rotating rollers 31 drive several steel wire ropes 33 to rotate synchronously through the rotating wheel assembly 32. That is, the steel wire rope 33 located on the upper part of the rotating roller 31 moves to the left, and the steel wire rope 33 located on the lower part of the rotating roller 31 moves to the right.

[0048] The operator lays the leather flat on the upper side of the steel wire rope 33 and in a position where the steel wire rope 33 is tightly arranged. The rotating steel wire rope 33 drives the leather to move continuously to the left, so that the leather moves from the area where the steel wire rope 33 is tightly arranged to the area where the steel wire rope 33 is loosely arranged. During this process, the steel wire rope 33 with gradually increasing spacing continuously generates a gradually separating pulling force on both sides of the leather, applying an effective flattening force to the leather, thereby automatically eliminating the curls and wrinkles on the surface of the leather and significantly improving the flatness of the leather before spraying.

[0049] In this embodiment, a synchronous motor is fixedly installed on the frame 1. When the synchronous motor is started, it drives the corresponding rotating roller 31 to rotate, thereby driving the steel wire rope 33 to move continuously and transport the leather.

[0050] See Figure 1 , Figure 2 and Figure 4 The leveling mechanism 4 includes two rope pressing rollers 42 connected by a connecting component 41. The two rope pressing rollers 42 press down on the wire rope 33, so that the wire rope 33 between the two rope pressing rollers 42 is arranged horizontally.

[0051] Before spraying the leather, the connecting component 41 drives the two pressure rollers 42 to move downwards, so that the two pressure rollers 42 press down on the upper sides of the steel wire rope 33 respectively, so that the supporting surface of each steel wire rope 33 is in close contact with the cylindrical surface of the two pressure rollers 42, thereby aligning each steel wire rope 33 with the two pressure rollers 42, so that the part of each steel wire rope 33 between the two pressure rollers 42 is arranged horizontally, effectively avoiding wrinkles in the leather during the conveying process due to uneven coating on the surface of the steel wire rope 33, and effectively ensuring that the conveying plane of the spraying area is always flat and consistent.

[0052] To further achieve a horizontal arrangement of the wire rope 33 between the two pressure rollers 42, the present invention designs the following structure: (See attached diagram) Figure 1 , Figure 2 , Figure 4 , Figure 5 , Figure 7 and Figure 9 The leveling mechanism 4 also includes a cylindrical scraper 44 arranged by a number of linkage components 43. The cylindrical scraper 44 corresponds one-to-one with the steel wire rope 33, and the cylindrical scraper 44 and the corresponding steel wire rope 33 are arranged coaxially and do not contact each other.

[0053] When spraying leather, the cylindrical scraper 44 is located at the lower part of the rotating roller 31, and each cylindrical scraper 44 is coaxially arranged on the outside of the steel wire rope 33. The annular blade of the cylindrical scraper 44 faces to the left, so that when the steel wire rope 33 located at the lower part of the rotating roller 31 moves to the right, the cylindrical scraper 44 scrapes off the excess coating on the steel wire rope 33 and cleans the dried coating accumulated on the surface of the steel wire rope 33 in a timely manner.

[0054] To further prevent localized protrusions or knots on the wire ropes 33, thus maintaining a consistent diameter and smooth surface for each wire rope 33 and preventing unevenness of the support surface caused by paint buildup; and with the cylindrical scraper 44 coaxially arranged with the corresponding wire rope 33 but not in contact, it can effectively scrape off the adhering paint while avoiding mechanical scratches or wear on the wire ropes 33, thereby extending the service life of the wire ropes 33.

[0055] To facilitate the disassembly and cleaning of the cylindrical scraper 44, and to facilitate the collection of the paint scraped off by the cylindrical scraper 44, the present invention is designed with the following structure: (See reference) Figure 2 , Figure 5 , Figure 7 and Figure 9 The cylindrical scraper 44 has two U-shaped grooves arranged opposite to each other, which are used to fit the cylindrical scraper 44 on the outside of the wire rope 33. A collection trough 441 is fixedly installed on the frame 1 at the position corresponding to the cylindrical scraper 44.

[0056] In this embodiment, the cylindrical scraper 44 consists of two C-shaped annular cutters and a base. The openings on the two annular cutters are U-shaped grooves. When placing the cylindrical scraper 44, the operator moves the cylindrical scraper 44 so that the steel wire rope 33 passes through the two U-shaped grooves one after the other, thereby arranging the cylindrical scraper 44 and the steel wire rope 33 coaxially. Since the two U-shaped grooves face each other, the two annular cutters complement each other and can cover the entire surface of the steel wire rope 33, avoiding leakage. The paint scraped off by the cylindrical scraper 44 falls into the collection tank 441.

[0057] To facilitate adjustment of the spacing of the steel wire ropes 33 according to the size of the leather, the present invention designs the following structure: (See attached diagram) Figure 1 , Figure 2 , Figure 3 , Figure 5 and Figure 6 The rotating wheel assembly 32 includes a rope wheel 321 that is axially slidably sleeved on the outside of the rotating roller 31. The rope wheels 321 on the two rotating rollers 31 correspond one to one. The wire rope 33 is wound around the two corresponding rope wheels 321. A fastening screw is rotatably provided on the rope wheel 321. The rope wheel 321 is pressed against the rotating roller 31 by the fastening screw, so that the rope wheel 321 is locked on the rotating roller 31.

[0058] When changing to different sizes of leather, the operator manually slides the rope wheel 321 on the rotating roller 31 along its axial direction, and then uses fastening screws to lock the rope wheel 321 on the corresponding rotating roller 31, thereby adjusting the density of the distribution of the steel wire ropes 33. This ensures that the steel wire ropes 33 in the middle of the leather are more densely arranged, while the steel wire ropes 33 on both sides of the leather are sparsely arranged, which can not only provide stable support for the leather, but also continuously pull and flatten the sides of the leather.

[0059] It should be noted that for leathers of similar size from the same batch, there is no need to adjust the material for each loading. Only the position of the rope wheel 321 needs to be adjusted once to continue the spraying operation.

[0060] To facilitate the horizontal adjustment of the wire rope 33 section located between the two rotating rollers 31, the present invention designs the following structure: (See attached diagram) Figure 1 , Figure 2 and Figure 4 The connecting assembly 41 includes a lifting frame 411 that is slidably mounted on the frame 1. A hydraulic cylinder 412 is fixedly mounted on the frame 1. The telescopic section of the hydraulic cylinder 412 is fixedly connected to the lifting frame 411. The rope pressing rollers 42 are rotatably connected to both sides of the lifting frame 411. The two rope pressing rollers 42 are arranged horizontally. A transition cover 413 for covering the rope pressing rollers 42 is fixedly mounted on the upper side of the lifting frame 411.

[0061] When spraying leather, the telescopic section of the retracting hydraulic cylinder 412 pulls the lifting frame 411 downward, causing the lifting frame 411 to drive the pressure roller 42 to press down on the wire rope 33, forcing the supporting surfaces of each wire rope 33 to be confined to the same horizontal plane. When loading, the operator lays the leather flat on the right transition cover 413, and makes the leather partially contact the wire rope 33 between the two pressure rollers 42, so that the wire rope 33 automatically pulls the leather through the right transition cover 413. The two transition covers 413 can also effectively shield the upper side of the pressure roller 42 to prevent paint from splashing onto the pressure roller 42 and ensure the horizontality of the cylindrical surface of the pressure roller 42.

[0062] It should be noted that the transition cover 413 is relatively close to the steel wire rope 33 on both sides, and the central bulge of the transition cover 413 is not high, which makes the slope of the transition cover 413 relatively gentle and the upper surface of the transition cover 413 relatively smooth, allowing the leather to slide smoothly on the transition cover 413.

[0063] To facilitate the synchronous movement of the cylindrical scraper 44 with the position and angle of the corresponding wire rope 33 when adjusting the spacing of the wire rope 33, the present invention designs the following structure: (See attached diagram) Figure 1 , Figure 2 , Figure 5 , Figure 6 , Figure 7 and Figure 8 The linkage component 43 includes two movable seats 431 that are slidably connected to the frame 1. An upper rod 432 is rotatably mounted on the right movable seat 431, and a lower rod 433 is rotatably mounted on the left movable seat 431. The upper rod 432 and the lower rod 433 are slidably connected together. The movable seat 431 is rotatably connected to the corresponding rope wheel 321. The cylindrical scraper 44 is fixedly connected to the upper rod 432. Two limit wheels are rotatably mounted on the upper side of the movable seat 431. The two limit wheels are rolled and limited at the edge position of the corresponding rope wheel 321.

[0064] When the moving pulley 321 is moved, the pulley 321 drives the moving seat 431 to move synchronously through the two limit wheels. Since the upper rod 432 and the lower rod 433 are slidably connected together, they form a telescopic linkage structure. Because no matter how the moving seat 431 moves back and forth, the corresponding upper rod 432 and lower rod 433 are always located on the shortest line connecting the two corresponding moving seats 431. And since the wire rope 33 is also located on the shortest line connecting the two corresponding pulleys 321, the upper rod 432 and lower rod 433 always follow the corresponding wire rope 33 to move synchronously.

[0065] In this embodiment, the base of the cylindrical scraper 44 is fixedly installed on the upper side of the upper rod 432, and the axial direction of the cylindrical scraper 44 is parallel to the length direction of the upper rod 432, so that the cylindrical scraper 44 moves and swings synchronously with the upper rod 432, thereby enabling the cylindrical scraper 44 to always correspond to the coaxial position of the wire rope 33.

[0066] In this embodiment, a tensioning frame is vertically slidably mounted on the lower rod 433, and a tensioning wheel rotates on the tensioning frame. A tensioning spring is provided between the tensioning frame and the lower rod 433. The tensioning spring is selected by those skilled in the art through repeated testing of its elasticity. The tensioning spring pushes the tensioning frame downward through its elasticity, and the tensioning frame pulls the portion of the wire rope 33 located below the rotating roller 31 downward through the tensioning wheel, thereby achieving real-time tensioning of the wire rope 33 and ensuring that each wire rope 33 can abut against the pressure roller 42.

[0067] In this embodiment, a support frame is fixedly installed on the upper side of the upper rod 432 and on the left side of the corresponding cylindrical scraper 44. A support wheel is rotatably installed on the support frame. The support wheel is used to support the wire rope 33 upward and prevent the tension wheel from pulling the wire rope 33 downward, causing the wire rope 33 and the cylindrical scraper 44 to be out of axis, resulting in the cylindrical scraper 44 continuously scratching the wire rope 33.

[0068] In addition, the present invention also provides a spraying method for leather processing, the specific steps of which are as follows: S1, according to the width of the leather to be sprayed, the distribution spacing of the steel wire rope 33 is adjusted by axially sliding the corresponding rope wheel 321 to adapt to the width of the leather, and the lifting frame 411 drives the two rope pressing rollers 42 to descend, pressing down the steel wire rope 33 so that the steel wire rope 33 between the two rope pressing rollers 42 is kept horizontally arranged.

[0069] S2. Place the leather to be sprayed at the feed port on the upper right side of the steel wire rope 33, and drive the steel wire rope 33 to rotate. The leather is conveyed forward with the steel wire rope 33. The loose arrangement of the steel wire rope 33 applies a flattening force to the leather, effectively eliminating curling and wrinkles on the surface of the leather.

[0070] S3. The leather is conveyed to the bottom of the spraying assembly 2 while remaining flat. The spraying assembly 2 moves back and forth on the frame 1 to spray the leather surface evenly. After the spraying is completed, the leather continues to be conveyed by the wire rope 33 to the discharge port on the upper left side, so that the leather is separated and discharged.

[0071] S4. After the steel wire rope 33 cuts the leather, it rotates to the lower part, so that the steel wire rope 33 moves to the position of the cylindrical scraper 44, so that the cylindrical scraper 44 scrapes off the excess coating that has passed the outside of the steel wire rope 33.

[0072] In summary, in leather finishing production, wrinkles on the leather surface can lead to severely uneven coating thickness distribution, with incomplete spraying in recessed areas and excessive thickness in raised areas. After drying, these areas are prone to cracking and peeling, directly affecting the folding strength and appearance grade of the finished leather. At the same time, excessive coating accumulated in the wrinkles can easily form powdery peeling or whitening defects in subsequent processes, significantly reducing the product qualification rate. Existing technologies rely on manual smoothing of the leather during loading, which cannot cope with the dynamic wrinkles caused by uneven support surfaces and vibrations of the steel wire rope 33 during the conveying process.

[0073] This invention utilizes a variable spacing arrangement of steel wire ropes 33, from tightly packed to loosely spaced, to generate a continuous pulling force separating the two sides of the leather, automatically reducing the possibility of curling and wrinkling during the conveying process. Combined with the downward pressure of two rope-pressing rollers 42 on the steel wire ropes 33, the supporting surfaces of each steel wire rope 33 are forced to remain on the same horizontal plane, preventing localized protrusions caused by uneven coating adhesion that could damage the flatness. Simultaneously, a cylindrical scraper 44 continuously cleans the dried coating from the surface of the steel wire ropes 33, ensuring that each steel wire rope 33 has a consistent diameter and a smooth surface. This maintains the horizontality of the conveying plane during long-term operation, effectively solving the technical problem of wrinkling caused by the uneven surface of the steel wire ropes 33 and the lack of automatic flattening function in existing spraying devices. It possesses significant industrial practicality and application value.

[0074] In the description of this invention, it should be understood that the terms "center," "longitudinal," "lateral," "length," "width," "thickness," "upper," "lower," "front," "rear," "left," "vertical," "horizontal," "top," "bottom," "inner," "outer," "clockwise," "counterclockwise," "axial," "radial," and "circumferential" indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are used only for the convenience of describing this invention and simplifying the description, and are not intended to indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this invention.

[0075] Furthermore, the terms "first," "second," "number one," and "number two" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Thus, a feature defined as "first," "second," "number one," or "number two" may explicitly or implicitly include at least one of that feature. In the description of this invention, "a plurality of" means at least two, such as two, three, etc., unless otherwise explicitly specified.

[0076] In this invention, unless otherwise explicitly specified and limited, the terms "installation," "connection," "linking," and "fixing," etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components, unless otherwise explicitly limited. Those skilled in the art can understand the specific meaning of the above terms in this invention according to the specific circumstances.

[0077] The embodiments described herein are preferred embodiments of the present invention and are not intended to limit the scope of protection of the present invention. Therefore, all equivalent changes made in accordance with the structure, shape and principle of the present invention should be covered within the scope of protection of the present invention.

Claims

1. A spraying apparatus for leather processing, comprising a frame, wherein a reciprocating spraying assembly is mounted on the frame, characterized in that, The frame is equipped with a conveyor mechanism for transporting leather. While the conveyor mechanism moves the leather, it also helps to flatten it. The frame is also equipped with a leveling mechanism for the leveling conveyor mechanism. The conveying mechanism includes two rotating rollers rotatably arranged on the frame. Several steel wire ropes are arranged on the two rotating rollers through a wheel assembly. The steel wire ropes are arranged closely near the feed point and loosely near the discharge point. The leveling mechanism includes two rope pressing rollers connected by a connecting component. The two rope pressing rollers press down on the wire rope, so that the wire rope portion between the two rope pressing rollers is arranged horizontally. The leveling mechanism also includes a cylindrical scraper set by several linkage components. The cylindrical scraper corresponds to a steel wire rope, and the cylindrical scraper and the corresponding steel wire rope are arranged coaxially and do not contact each other. The linkage component includes two movable seats that are slidably connected to the frame, with an upper rod rotatably mounted on the right movable seat and a lower rod rotatably mounted on the left movable seat. The upper rod and the lower rod are slidably connected together, the movable seat is rotatably connected to the rope wheel at the corresponding position, and the cylindrical scraper is fixedly connected to the upper rod; The cylindrical scraper has two U-shaped grooves arranged opposite to each other, which are used to fit the cylindrical scraper on the outside of the wire rope. A collection trough is fixedly installed on the frame at the position corresponding to the cylindrical scraper.

2. The spraying device for leather processing according to claim 1, characterized in that, The rotating wheel assembly includes a rope wheel that is axially slidably sleeved on the outside of the rotating roller. The rope wheels on the two rotating rollers correspond one-to-one, and the wire rope is wound around the two corresponding rope wheels.

3. The spraying device for leather processing according to claim 2, characterized in that, The rope wheel is rotatably equipped with a fastening screw, which presses against the rotating roller, thus locking the rope wheel onto the rotating roller.

4. The spraying device for leather processing according to claim 1, characterized in that, The connecting assembly includes a lifting frame that slides up and down on the frame, and a hydraulic cylinder is fixedly installed on the frame. The telescopic section of the hydraulic cylinder is fixedly connected to the lifting frame.

5. A spraying apparatus for leather processing according to claim 4, characterized in that, The rope pressing rollers are rotatably connected to both sides of the lifting frame. The two rope pressing rollers are arranged horizontally, and a transition cover for covering the rope pressing rollers is fixedly installed on the upper side of the lifting frame.

6. The spraying apparatus for leather processing according to claim 1, characterized in that, The upper side of the movable seat is rotatably equipped with two limit wheels, which roll and limit the position of the corresponding rope wheel at the edge position.

7. A method for spraying leather, using the spraying apparatus for leather processing according to any one of claims 1 to 6, characterized in that, The specific spraying method steps are as follows: S1. According to the width of the leather to be sprayed, the distribution spacing of each steel wire rope is adjusted by the rotating wheel assembly to match the width of the leather. The leveling mechanism drives the two rope pressing rollers downward to press down the steel wire ropes so that the steel wire rope section between the two rope pressing rollers is kept horizontal. S2. Place the leather to be sprayed at the feed point of the steel wire rope and drive the steel wire rope to rotate. The leather is conveyed forward with the steel wire rope. The leather is flattened by the loose arrangement of the steel wire rope, which effectively eliminates the curling and wrinkles on the surface of the leather. S3. The leather is conveyed to the bottom of the spraying assembly while remaining flat. The spraying assembly moves back and forth on the frame to spray the leather surface evenly. After the coating is completed, the leather continues to be conveyed to the discharge point by steel wire rope, so that the leather is separated and discharged. S4. After the steel wire rope cuts the leather, it rotates to the lower part, causing the steel wire rope to move to the position of the cylindrical scraper, so that the cylindrical scraper can scrape off the excess coating that has passed through the outside of the steel wire rope.

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