A self-cleaning printing loading groove device for synthetic leather and a cleaning method

Abstract

A kind of self-cleaning synthetic leather printing loading groove device and cleaning method, including loading groove (10), printing roller (20) and ultrasonic cleaner (30), the surface of the printing roller (20) at least includes one or more regions of no printing area (201), fine printing area (202), coarse printing area (203) and composite printing area (204) along the axial direction and / or circumferential direction, the ultrasonic cleaner (30) is set to be able to emit different frequency ultrasonic waves to the region, reach the cleaning effect of high efficiency, and can control the rotational speed of printing roller (20) in the cleaning process, to reduce the invalid cleaning time for the surface of printing roller (20), to improve the efficiency of ultrasonic cleaning as a whole.

Description

Technical Field

[0001] This invention belongs to the technical field of synthetic leather printing equipment, specifically referring to a self-cleaning synthetic leather printing feeder device and cleaning method. Background Technology

[0002] Synthetic leather is a plastic product that mimics the composition and structure of natural leather and can be used as a substitute. Usually, its surface needs to be printed with patterns by a printing machine according to the usage requirements. The printing rollers and printing feed tank of the printing machine must be cleaned after each production or when the surface treatment liquid is changed. Moreover, the surface structure of the printing rollers is fine and complex, making them extremely difficult to clean. Materials are easily contaminated. If the printing rollers are not cleaned properly during the production process, it will have a great impact on the uniformity of liquid application in the subsequent synthetic leather.

[0003] The conventional cleaning method involves using a brush and cleaning agent to clean the printing roller and the feeding trough. This method is inefficient and does not easily clean the roller thoroughly. Currently, high-pressure nozzles are installed in the feeding trough or ultrasonic cleaning is used. However, this method cannot be adjusted to the fineness of the patterns in different areas of the printing roller surface. It is still a uniform cleaning of the printing roller surface, so the problem of low efficiency still exists. Summary of the Invention

[0004] In view of the above situation and to overcome the defects of the prior art, the present invention creatively adopts a self-cleaning synthetic leather printing feeder device and cleaning method to at least partially solve the problems mentioned in the background art.

[0005] The technical solution adopted is as follows: The first aspect of this invention proposes a self-cleaning printing feeder device for synthetic leather, comprising:

[0006] The feeding chute is designed to be open.

[0007] A printing roller is disposed inside the feeding trough, and a portion of the printing roller protrudes above the opening of the feeding trough;

[0008] An ultrasonic cleaner is located at the bottom of the feeding trough and configured to emit ultrasonic waves toward the printing roller.

[0009] The ultrasonic cleaner is configured to emit ultrasonic waves of different frequencies into the area.

[0010] Furthermore, the ultrasonic cleaner includes:

[0011] An ultrasonic transducer, with its working end fixedly attached to the bottom surface of the feeding trough;

[0012] An ultrasonic generator is configured to be electrically connected to the ultrasonic transducer and is used to drive the ultrasonic transducer to emit ultrasonic waves of a set frequency.

[0013] A power controller is configured to be electrically connected to the ultrasonic generator and is used to adjust the output frequency of the ultrasonic generator, thereby adjusting the frequency of the ultrasonic waves emitted by the ultrasonic transducer.

[0014] Definition: The printing roller comprises N regions along its axial direction, where N is a natural number. N sets of ultrasonic transducers are correspondingly arranged at the bottom of the feeding trough. The ultrasonic transducers are configured such that the frequencies of the N sets of ultrasonic transducers correspond to the N regions of the printing roller. The N regions include multiple printing zone types, and each printing zone corresponds to a different frequency of the ultrasonic transducer.

[0015] Furthermore, all N groups of ultrasonic transducers are located at the intersection of the printing roller axis and the bottom surface of the feeding trough, and each group includes at least two ultrasonic transducers.

[0016] Furthermore, it also includes a guide plate, which is disposed between the ultrasonic cleaner and the printing roller, and is used to guide the liquid medium in the feeding tank near the ultrasonic cleaner to the surface of the printing roller along the axis connecting the ultrasonic cleaner and the printing roller.

[0017] Furthermore, the guide vane includes:

[0018] The manifold is fixedly installed at the bottom of the inside of the feeding trough;

[0019] The second guide plate is disposed on the outside of the printing roller, near the ultrasonic cleaner.

[0020] A first guide plate is disposed between the converging plate and the second guide plate, and a guide channel is formed between the converging plate and the first guide plate;

[0021] The inner side of the manifold is provided with a manifold channel, and the outer wall of the manifold is provided with a manifold hole, so that the inside of the feeding trough is connected to the manifold channel through the manifold hole.

[0022] Furthermore, in the region including the fine printing area along the axis of the printing roller, the inner wall of the first guide plate is provided with a first guide plate and / or the inner wall of the second guide plate is provided with a second guide plate; in the region excluding the fine printing area along the axis of the printing roller, the inner wall of the first guide plate is provided with a guide plate.

[0023] Furthermore, the flow of liquid between the printing roller and the guide plate along the rotation direction of the printing roller is defined as positive flow, and the surface of the second guide plate is provided with a guide groove to obstruct the positive flow of liquid.

[0024] Furthermore, the second guide plate is configured as an arc-shaped plate coaxial with the printing roller, and the distance between the second guide plate and the printing roller is less than 20 mm, and the width of the guide channel is less than 10 cm.

[0025] Furthermore, a baffle is provided at one end of the second guide plate facing the rotation direction of the printing roller, and the distance between the baffle and the printing roller is smaller than the distance between the second guide plate and the printing roller.

[0026] A second aspect of the present invention provides a cleaning method for a self-cleaning printing feeder device for synthetic leather, comprising the following steps:

[0027] Step 1, Preparation: Based on the complexity of the surface texture of the printing roller, the surface is divided into one or more regions along the axial and / or circumferential directions, including at least an unprinted area, a finely printed area, a sparsely printed area, and a composite printed area. Define that when the unprinted area is above the ultrasonic transducer, the ultrasonic transducer generates ultrasonic waves of a first frequency; when the finely printed area is above the ultrasonic transducer, the ultrasonic transducer generates ultrasonic waves of a second frequency; when the sparsely printed area is above the ultrasonic transducer, the ultrasonic transducer generates ultrasonic waves of a third frequency; and when the composite printed area is above the ultrasonic transducer, the ultrasonic transducer generates ultrasonic waves of both the second and third frequencies, wherein the second frequency < the first frequency < the third frequency. The partitioned information is input into the power controller, enabling the power controller to output electrical signals of different frequencies to the ultrasonic generator according to different areas.

[0028] Step 2, Cleaning: Add cleaning agent to the feed tank, turn on the ultrasonic cleaner, and control the linear speed of the printing roller to be between V1 and V2. When only the unprinted area faces the ultrasonic cleaner, the printing roller rotates at speed V2. When only the sparsely printed area or the unprinted area and the sparsely printed area face the ultrasonic cleaner, the printing roller rotates at speed V3. When both the unprinted area and / or the composite printed area face the ultrasonic cleaner, the printing roller rotates at speed V1, where V1 < V3 < V2.

[0029] In step 2, V1 is set to be greater than 2 cm / min, and V2 is set to be less than 1 cm / s.

[0030] The beneficial effects achieved by the present invention using the above structure are as follows:

[0031] (1) Based on the different fineness and complexity of the surface decoration of the printing roller, multiple areas are set on the surface of the printing roller so that the ultrasonic cleaner can emit ultrasonic waves of different frequencies to different areas in a targeted manner to achieve a high-efficiency cleaning effect.

[0032] (2) The adjustable frequency ultrasonic cleaner is integrated with the printing press feeding tank, so that the printing press feeding tank has self-cleaning ability and does not require manual cleaning, making the cleaning method of the printing press feeding tank simpler. Attached Figure Description

[0033] Figure 1 This is a three-dimensional structural schematic diagram of a self-cleaning synthetic leather printing feeder device according to an embodiment of the present invention;

[0034] Figure 2 This is a cross-sectional view of a printing feeder device for self-cleaning synthetic leather according to an embodiment of the present invention;

[0035] Figure 3 This is a schematic diagram of the internal structure of a printing feeder device for self-cleaning synthetic leather according to an embodiment of the present invention;

[0036] Figure 4 This is a schematic cross-sectional view of a printing feeder device for self-cleaning synthetic leather according to an embodiment of the present invention.

[0037] Figure 5 This is a three-dimensional structural diagram of the guide plate in a self-cleaning synthetic leather printing feeder device proposed in an embodiment of the present invention.

[0038] Among them, 10 is the feeding trough; 20 is the printing roller; 201 is the non-printing area; 202 is the fine printing area; 203 is the coarse printing area; 204 is the composite printing area; 21 is the rotating shaft; 30 is the ultrasonic cleaner; 31 is the ultrasonic transducer; 32 is the ultrasonic generator; 33 is the power controller; 34 is the housing; 40 is the guide plate; 400 is the confluence channel; 401 is the first confluence channel; 402 is the second confluence channel; 41 is the confluence plate; 410 is the confluence hole; 42 is the first confluence plate; 421 is the guide plate; 422 is the first guide plate; 43 is the second confluence plate; 430 is the guide groove; 431 is the second guide plate; and 432 is the baffle.

[0039] The accompanying drawings are provided to further understand the embodiments and form part of the specification. They are used together with the embodiments for explanation and do not constitute a limitation on the embodiments. Detailed Implementation

[0040] The technical solutions in 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, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection.

[0041] In the description of the embodiments, it should be understood that the terms "upper", "lower", "front", "rear", "left", "right", "top", "bottom", "inner", "outer", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings. They are only for the convenience of describing the embodiments and simplifying the description, and do not 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 the embodiments.

[0042] Because of the fine and complex surface structure of printing rollers, ordinary cleaning methods (such as brushing and rinsing) are difficult to thoroughly remove the surface treatment liquid within the surface structure. Therefore, ultrasonic cleaning is currently used to clean printing rollers. Although it is an improvement over ordinary cleaning methods, the cleaning effect of ultrasonic waves emitted at a fixed frequency on the fine and complex areas of the roller is limited. For example, the bubbles generated by high-frequency ultrasonic waves are relatively large. While they have a strong cleaning ability for general surface structures, they are difficult to penetrate into the fine and complex surface grooves of the printing roller. Therefore, the cleaning effect on local fine structures is poor. If residual surface treatment liquid remains in this area after cleaning, it will affect the uniformity of the surface treatment liquid diffusion on the surface of the printing roller in subsequent production.

[0043] Therefore, in the embodiments of the present invention, a first aspect proposes a printing feeder device for self-cleaning synthetic leather, which aims to improve the cleaning efficiency of ultrasonic cleaning on the surface of the printing roller and improve the cleaning effect. The device mainly includes a feeder 10, a printing roller 20 and an ultrasonic cleaner 30.

[0044] like Figure 1 As shown, the feeding trough 10 is configured as an open container, generally a rectangular trough with the opening facing upwards, which is used to hold leather surface treatment liquid. The printing roller 20 is disposed inside the feeding trough 10. The end of the printing roller 20 is provided with a rotating shaft 21 connected to an external power device, so that the printing roller 20 can be driven to rotate around the rotating shaft 21. The printing roller 20 protrudes above the opening of the feeding trough 10, so that the upper part of the printing roller 20 can contact the leather for printing.

[0045] like Figure 1 and Figure 2As shown, furthermore, in order to enable the feeding tank 10 to have self-cleaning capability, an ultrasonic cleaner 30 is installed at the bottom of the feeding tank 10, which can emit ultrasonic waves in the direction of the printing roller 20. In this way, when the production line changes leather and needs to change the surface treatment liquid, and it is necessary to clean the feeding tank 10 and the printing roller 20, the surface treatment liquid in the feeding tank 10 is emptied, and cleaning agent is added to the feeding tank 10. The ultrasonic cleaner 30 can be turned on to clean the feeding tank 10 and the printing roller 20 without the need for manual washing or rinsing.

[0046] In order to differentiate the complexity and fineness of the surface texture of the printing roller 20 so that the ultrasonic cleaner 30 can clean it in a targeted manner, the surface of the printing roller 20 includes at least one or more of the following areas along the axial and / or circumferential directions: no printed area 201, fine printed area 202, coarse printed area 203, and composite printed area 204. The ultrasonic cleaner 30 is configured to emit ultrasonic waves of different frequencies into the areas.

[0047] In some embodiments, such as Figure 2 As shown, the ultrasonic cleaner 30 includes at least an ultrasonic transducer 31, an ultrasonic generator 32, and a power controller 33.

[0048] The working end of the ultrasonic transducer 31 is fixed to the bottom surface of the feeding tank 10. The ultrasonic generator 32 is electrically connected to the ultrasonic transducer 31 and is used to drive the ultrasonic transducer 31 to emit ultrasonic waves of a set frequency. The power controller 33 is electrically connected to the ultrasonic generator 32 and is used to adjust the output frequency of the ultrasonic generator 32, thereby adjusting the frequency of the ultrasonic waves emitted by the ultrasonic transducer 31. In this way, the frequency of the ultrasonic waves emitted by the ultrasonic transducer 31 can be controlled by the power controller 33.

[0049] In order to integrate the ultrasonic cleaner 30 and the feeding tank 10 together, the ultrasonic cleaner 30 also includes a housing 34, which is fixedly installed at the bottom of the feeding tank 10 corresponding to the bottom of the printing roller 20. At least a plurality of ultrasonic transducers 31 are installed in the housing 34, wherein the ultrasonic generator 32 and the power controller 33 can be built into the housing 34 or externally for easy maintenance.

[0050] In some embodiments, depending on the complexity of the surface texture of the printing roller 20, when the unprinted area 201 is above the ultrasonic transducer 31, the ultrasonic transducer 31 generates ultrasonic waves of a first frequency; when the finely printed area 202 is above the ultrasonic transducer 31, the ultrasonic transducer 31 generates ultrasonic waves of a second frequency; when the sparsely printed area 203 is above the ultrasonic transducer 31, the ultrasonic transducer 31 generates ultrasonic waves of a third frequency; and when the composite printed area 204 is above the ultrasonic transducer 31, the ultrasonic transducer 31 generates ultrasonic waves of both the second and third frequencies, wherein the second frequency < the first frequency < the third frequency.

[0051] In some embodiments, such as Figure 3 As shown, the printing roller 20 includes 7 regions along its axial direction. Seven sets of ultrasonic transducers 31 are correspondingly arranged at the bottom of the feeding trough 10. According to the left-to-right direction of the axial direction in the figure, the first / seventh part is the unprinted area 201, the second / fourth / sixth part is a combined area of ​​fine printing area 202 and composite printing area 204 (where the composite printing area 204 occupies the entire circumference), and the third / fifth part is the coarse printing area 203. The ultrasonic transducers 31 can be controlled by the power controller 33 to emit ultrasonic waves of the first frequency throughout the cleaning process of the first / seventh part, ultrasonic waves of the third frequency throughout the cleaning process of the first / seventh part, and ultrasonic waves of the second frequency throughout the cleaning process of the second / fourth / sixth part. According to the rotation speed of the printing roller 20 during cleaning and the length of the composite printing area 204, the ultrasonic transducers 31 of the second / fourth / sixth part are controlled to emit ultrasonic waves of the third frequency at fixed intervals, so that the composite printing area 204 can be cleaned by ultrasonic waves of the second and third frequencies when passing through the ultrasonic transducers 31.

[0052] In this way, the printing roller 20 is divided into zones according to the complexity and fineness of its surface texture, and the ultrasonic transducer 31 emits ultrasonic waves at frequencies suitable for the complexity and fineness of the texture of each zone, thereby improving the cleaning speed and cleaning capacity of the ultrasonic cleaning method for the printing roller 20.

[0053] To improve the efficiency of the ultrasonic waves emitted by the ultrasonic transducer 31 acting on the surface of the printing roller 20, multiple sets of ultrasonic transducers 31 are arranged at the intersection of the axis of the printing roller 20 and the bottom surface of the feeding trough 10, so that the straight-line distance between the ultrasonic transducer 31 and the printing roller 20 is relatively short, thereby reducing the attenuation of the ultrasonic waves when they reach the surface of the printing roller 20. At the same time, each set includes at least two ultrasonic transducers 31, which can emit ultrasonic waves of different frequencies to cope with the complex texture processing on the surface of the printing roller 20.

[0054] When ultrasonic waves propagate in water, they travel in the output direction. However, since the printing roller 20 is constantly rotating during cleaning, the fluid flow generated during rotation affects the fluid flow between the ultrasonic cleaner 30 and the printing roller 20. Figure 4 As shown, in order to further reduce the influence of water flow on ultrasonic liquid flow when printing roller 20 rotates, the device also includes a guide plate 40. The guide plate 40 is disposed between ultrasonic cleaner 30 and printing roller 20 and is used to guide the liquid medium in the feeding tank 10 near ultrasonic cleaner 30 to the surface of printing roller 20 along the axis connecting ultrasonic cleaner 30 and printing roller 20, thereby further improving the efficiency of ultrasonic cleaning process on printing roller 20.

[0055] In some embodiments, the guide plate 40 includes a confluence plate 41, a first guide plate 42, and a second guide plate 43.

[0056] The manifold 41 is fixedly installed at the bottom of the feed trough 10, the second guide plate 43 is installed on the outside of the printing roller 20 near the ultrasonic cleaner 30, and the first guide plate 42 is installed between the manifold 41 and the second guide plate 43, forming a guide channel between the manifold 41 and the first guide plate 42. In this way, the influence of the liquid flow generated when the printing roller 20 rotates on the liquid flow between the ultrasonic cleaner 30 and the printing roller 20 can be reduced.

[0057] like Figure 4 and Figure 5 As shown, the cross-section of the manifold 41 is constructed in the shape of an inverted horn or an inverted cone, and its lower part covers the width of the entire distribution of the ultrasonic transducers 31, which can converge the liquid flow in the ultrasonic region generated by the ultrasonic transducers 31 towards the direction of the first guide plate 42.

[0058] In order to ensure that liquid medium always enters the inner side of the manifold 41, a manifold channel 400 is provided on the inner side of the manifold 41, and a manifold hole 410 is provided on the surface wall of the manifold 41, so that the inside of the feeding trough 10 is connected to the manifold channel 400 through the manifold hole 410, so that the liquid outside the manifold 41 enters the manifold channel 400 through the manifold hole 410, and then flows towards the printing roller 20 under the action of ultrasonic waves.

[0059] In some embodiments, such as Figure 4 and Figure 5As shown, the first guide plate 42 is constructed as two thin plates parallel to the line connecting the ultrasonic cleaner 30 and the printing roller 20, with a flow channel between the plates, so that the liquid flow in this part is not affected by the liquid flow outside, thus reducing the attenuation of ultrasonic energy transmission. The second guide plate 43 is constructed as an arc-shaped plate coaxial with the printing roller 20, and the distance between the second guide plate 43 and the printing roller 20 is less than 20mm, and the width of the flow channel is less than 10cm, which can further compress the flow space of the liquid flow between the printing roller 20 and the ultrasonic cleaner 30, and reduce the attenuation of the liquid flow during the ultrasonic cleaning process.

[0060] Because different frequencies of ultrasound propagate in a liquid medium, resulting in different liquid flow velocities, in order to increase the flow velocity of the liquid medium in the low-frequency ultrasound portion, the inner wall of the first guide plate 42 and / or the inner wall of the second guide plate 43 are provided with a first guide plate 422 and / or a second guide plate 431 in the region including the fine printing area 202 along the axial direction of the printing roller 20. The flow channel is the first flow channel 401 where the first guide plate 422 and / or the second guide plate 43 are included, and the flow channel is the second flow channel 402 where the first guide plate 422 and / or the second guide plate 43 are not included. The channel cross-section of the first flow channel 401 is smaller than that of the second flow channel 402. In this way, the flow channel in the low-frequency ultrasound propagation region is smaller than that in the high-frequency ultrasound propagation region, which can increase the flow velocity of the liquid medium in this part.

[0061] In some embodiments, in the area excluding the fine printing area 202 along the axial direction of the printing roller 20, the inner wall of the first guide plate 42 is provided with a guide plate 421. The guide plate 421 is configured as a fin structure, which can guide the liquid flow and reduce energy loss during the liquid flow process.

[0062] like Figure 5 As shown, in order to slow down the flow speed of the liquid medium on the surface of the printing roller 20 and increase the effective duration of the ultrasonic cleaning action on the printing roller 20, the flow of liquid between the printing roller 20 and the guide plate 40 along the rotation direction of the printing roller 20 is defined as positive flow. The surface of the second guide plate 431 is provided with a guide groove 430 to obstruct the positive flow of liquid. The guide groove 430 can be constructed into a serpentine or other multi-curve structure, the purpose of which is to slow down the flow speed of liquid on the surface of the printing roller 20.

[0063] In some embodiments, a baffle 432 is provided at one end of the second guide plate 43 facing the rotation direction of the printing roller 20. The distance between the baffle 432 and the printing roller 20 is smaller than the distance between the second guide plate 43 and the printing roller 20. In this way, the liquid flow that follows the rotation of the printing roller 20 can be reduced from entering between the printing roller 20 and the second guide plate 43, thereby increasing the duration of the ultrasonic liquid flow on the surface of the printing roller 20.

[0064] In conjunction with the above embodiments, based on the complexity of the surface texture of the printing roller 20, multiple areas are set on the surface of the printing roller 20, so that the ultrasonic cleaner 30 can emit ultrasonic waves of different frequencies to different areas in a targeted manner to achieve a suitable and efficient cleaning effect. Furthermore, a guide plate 40 is arranged between the printing roller 20 and the ultrasonic cleaner 30 to reduce the influence of external liquid flow on the ultrasonic liquid flow, thereby further improving the working efficiency of the ultrasonic waves acting on the surface of the printing roller 20.

[0065] In an embodiment of the present invention, a second aspect provides a cleaning method for a self-cleaning printing feeder device for synthetic leather, which includes the following steps:

[0066] Step 1, Preparation: Based on the complexity of the surface texture of the printing roller 20, the surface is divided along the axial and / or circumferential directions into one or more regions, including at least an unprinted area 201, a finely printed area 202, a sparsely printed area 203, and a composite printed area 204. It is defined that when the unprinted area 201 is above the ultrasonic transducer 31, the ultrasonic transducer 31 generates ultrasonic waves of a first frequency; when the finely printed area 202 is above the ultrasonic transducer 31, the ultrasonic transducer 31 generates ultrasonic waves of a second frequency; when the sparsely printed area 203 is above the ultrasonic transducer 31, the ultrasonic transducer 31 generates ultrasonic waves of a third frequency; and when the composite printed area 204 is above the ultrasonic transducer 31, the ultrasonic transducer 31 generates ultrasonic waves of both the second and third frequencies, wherein the second frequency < the first frequency < the third frequency. The partitioned information is input into the power controller 33, enabling the power controller 33 to output electrical signals of different frequencies to the ultrasonic generator 32 according to different areas.

[0067] In step 1, based on the diameter of the printing roller 20, the rotation speed of the printing roller 20, and the position of each textured area after partitioning, it can be calculated which textured area passes through the ultrasonic cleaner 30 in each time period. Based on the specific classification of the textured areas, the ultrasonic transducer 31 is controlled to emit ultrasonic waves of different frequencies to carry out targeted cleaning work on the different textured areas on the surface of the printing roller 20.

[0068] Step 2, Cleaning: Add cleaning agent to the feed tank 10, turn on the ultrasonic cleaner 30, and control the linear speed of the printing roller 20 to be between V1 and V2. When only the unprinted area 201 faces the ultrasonic cleaner 30, the printing roller 20 rotates at a speed of V2. When only the sparsely printed area 203 or the unprinted area 201 and the sparsely printed area 203 face the ultrasonic cleaner 30, the printing roller 20 rotates at a speed of V3. When the unprinted area 201 and / or the composite printed area 204 face the ultrasonic cleaner 30, the printing roller 20 rotates at a speed of V1, where V1 < V3 < V2.

[0069] In step 2, V1 is set to be greater than 2 cm / min and V2 is set to be less than 1 cm / s. When the printing roller 20 rotates to the easy-to-clean area, the rotation speed is increased to shorten the cleaning time, while when the printing roller 20 rotates to the difficult-to-clean area, the rotation speed is reduced to extend the cleaning time. In this way, the ineffective cleaning time can be reduced, thereby improving the speed and cleaning capacity of the entire cleaning process.

[0070] In conjunction with the above embodiments, after dividing the surface of the printing roller 20 into complex and fine sections, the rotation speed of the printing roller 20 is controlled during cleaning. The rotation speed of the printing roller 20 is increased in areas that are easy to clean, and decreased in areas that are difficult to clean, so as to reduce the ineffective cleaning time on the surface of the printing roller 20 and thus improve the overall efficiency of ultrasonic cleaning.

[0071] It should be noted that, in this document, relational terms such as "first" and "second" are used only to distinguish one entity or operation from another, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Furthermore, the terms "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.

[0072] Although embodiments have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and variations can be made to these embodiments without departing from the principles and spirit, the scope of which is defined by the appended claims and their equivalents.

[0073] The embodiments have been described above, and such description is not restrictive. The figures shown are only one embodiment, and the actual structure is not limited to this. In short, if a person skilled in the art is inspired by this description and designs a similar structure and embodiment without departing from the inventive spirit, such design should fall within the scope of protection.

Claims

1. A printing feeder device for self-cleaning synthetic leather, characterized in that, include: The feeding trough (10) is set to be open; A printing roller (20) is disposed inside the feeding trough (10), and the printing roller (20) protrudes above the opening of the feeding trough (10); An ultrasonic cleaner (30) is provided at the bottom of the feeding trough (10) and configured to emit ultrasonic waves toward the printing roller (20); The ultrasonic cleaner (30) is configured to emit ultrasonic waves of different frequencies into the area, and the ultrasonic cleaner (30) includes: The working end of the ultrasonic transducer (31) is fixed to the bottom surface of the feeding trough (10); An ultrasonic generator (32) is configured to be electrically connected to the ultrasonic transducer (31) and to drive the ultrasonic transducer (31) to emit ultrasonic waves of a set frequency. A power controller (33) is configured to be electrically connected to the ultrasonic generator (32) and to adjust the output frequency of the ultrasonic generator (32), thereby adjusting the frequency of the ultrasonic waves emitted by the ultrasonic transducer (31). The printing roller (20) includes N regions along the axial direction, where N is a natural number. The ultrasonic transducers (31) are arranged in N groups at the bottom of the feeding trough (10). The ultrasonic transducers (31) are configured such that the frequencies of the N groups of ultrasonic transducers (31) correspond to the N regions of the printing roller. The N regions include multiple printing zone types, and each printing zone corresponds to a different frequency of the ultrasonic transducer (31). The N groups of ultrasonic transducers (31) are all located at the intersection of the axis of the printing roller (20) and the bottom surface of the feeding trough (10), and each group includes at least two ultrasonic transducers (31).

2. The self-cleaning synthetic leather printing feeder device according to claim 1, characterized in that: It also includes a guide plate (40), which is disposed between the ultrasonic cleaner (30) and the printing roller (20) and is used to guide the liquid medium in the feeding tank (10) near the ultrasonic cleaner (30) along the direction of the axis connecting the ultrasonic cleaner (30) and the printing roller (20) to the surface of the printing roller (20).

3. The self-cleaning synthetic leather printing feeder device according to claim 2, characterized in that: The guide vane (40) includes: The manifold (41) is fixedly installed at the bottom of the feed trough (10); The second guide plate (43) is disposed on the outside of the printing roller (20) on the side close to the ultrasonic cleaner (30); The first guide plate (42) is disposed between the confluence plate (41) and the second guide plate (43), and forms a guide channel between the confluence plate (41) and the first guide plate (42); The inner side of the manifold (41) is provided with a manifold channel (400), and the surface wall of the manifold (41) is provided with a manifold hole (410), so that the inside of the feeding trough (10) is connected to the manifold channel (400) through the manifold hole (410).

4. The self-cleaning synthetic leather printing feeder device according to claim 3, characterized in that: In the region including the fine printing area (202) along the axial direction of the printing roller (20), the inner wall of the first guide plate (42) is provided with a first guide plate (422) and / or the inner wall of the second guide plate (43) is provided with a second guide plate (431). In the region excluding the fine printing area (202) along the axial direction of the printing roller (20), the inner wall of the first guide plate (42) is provided with a guide plate (421).

5. The printing feeder device for self-cleaning synthetic leather according to claim 4, characterized in that: The flow of liquid between the printing roller (20) and the guide plate (40) along the rotation direction of the printing roller (20) is defined as positive flow, and the surface of the second guide plate (431) is provided with a guide groove (430) to obstruct the positive flow of liquid.

6. The self-cleaning synthetic leather printing feeder device according to claim 3, characterized in that: The second guide plate (43) is configured as an arc-shaped plate coaxial with the printing roller (20), and the distance between the second guide plate (43) and the printing roller (20) is less than 20 mm, and the width of the guide channel is less than 10 cm.

7. The self-cleaning synthetic leather printing feeder device according to claim 3, characterized in that: The second guide plate (43) has a baffle (432) at one end facing the rotation direction of the printing roller (20). The distance between the baffle (432) and the printing roller (20) is smaller than the distance between the second guide plate (43) and the printing roller (20).

8. A cleaning method for a self-cleaning synthetic leather printing feeder device, characterized in that: Using the self-cleaning synthetic leather printing feeder device as described in any one of claims 1-7 includes the following steps: Step 1, Pre-preparation: Based on the complexity of the surface texture of the printing roller (20), the surface is divided along the axial and / or circumferential directions into one or more areas including a non-printed area (201), a finely printed area (202), a sparsely printed area (203), and a composite printed area (204). It is defined that when the non-printed area (201) is above the ultrasonic transducer (31), the ultrasonic transducer (31) generates ultrasonic waves of a first frequency; when the finely printed area (202) is above the ultrasonic transducer (31), the ultrasonic transducer (31) generates ultrasonic waves of a second frequency. When the coarse printing area (203) is above the ultrasonic transducer (31), the ultrasonic transducer (31) generates ultrasonic waves of a third frequency. When the composite printing area (204) is above the ultrasonic transducer (31), the ultrasonic transducer (31) generates ultrasonic waves of a second frequency and a third frequency, wherein the second frequency < the first frequency < the third frequency. The partitioned information is input into the power controller (33) so that the power controller (33) can output electrical signals of different frequencies to the ultrasonic generator (32) according to different areas. Step 2, Cleaning: Add cleaning agent to the upper material tank (10), turn on the ultrasonic cleaner (30), and control the linear speed of the printing roller (20) to be between V1 and V2. When only the unprinted area (201) faces the ultrasonic cleaner (30), the printing roller (20) rotates at a speed of V2. When only the sparsely printed area (203) or the unprinted area (201) and the sparsely printed area (203) face the ultrasonic cleaner (30), the printing roller (20) rotates at a speed of V3. When the unprinted area (201) and / or the composite printed area (204) face the ultrasonic cleaner (30), the printing roller (20) rotates at a speed of V1, where V1 < V3 < V2. In step 2, V1 is set to be greater than 2 cm / min, and V2 is set to be less than 1 cm / s.

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