Front cleaning mechanism of PU artificial leather embossing machine

Abstract

The invention discloses a front cleaning mechanism of a PU artificial leather embossing machine, the front cleaning mechanism comprises a rack and a conveying device, the rack is provided with a cleaning device, the cleaning device comprises a cleaning box body, and a static electricity eliminator, a negative pressure dust collection module and a dust sticking module which are all arranged in the cleaning box body; the static electricity eliminator, the negative pressure dust collection module and the dust sticking module are sequentially arranged in the PU artificial leather conveying direction. The PU artificial leather embossing device has the beneficial effects that a multi-stage pre-cleaning treatment process of static elimination, negative pressure dust collection and sticky dust contact is carried out on the to-be-embossed surface of PU artificial leather through the cleaning device, so that the situation that impurities are pressed into a coating under the high-temperature and high-pressure effect of embossing to form convex particles or concave pits is avoided, and the continuity and smoothness of embossed patterns are ensured; and the problems of shallow pattern indentations and fuzzy edges of areas covered by impurities due to the fact that the impurities on the to-be-embossed surface of the PU artificial leather hinder full contact between the embossing roller and the PU coating are avoided, and the appearance consistency and the yield of embossed finished products are improved.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of artificial leather processing equipment, more specifically, it relates to a front cleaning mechanism of a PU artificial leather embossing machine. BACKGROUND

[0002] Polyurethane (PU) artificial leather, as a representative branch of synthetic leather, originated from the industrialization exploration of natural leather replacement demand in the mid-20th century. Traditional natural leather is limited by the scarcity of animal resources, long processing cycle (such as complex tanning process), high cost (especially high-end leather), and limited hygiene performance (such as uneven air permeability and easy bacterial growth), making it difficult to meet the needs of modern manufacturing for large-scale, standardized, and low-cost functional materials. In this context, PU synthetic leather, through the composite structure of "fabric base + polyurethane coating", simulates the appearance (such as texture, color), touch (softness, ductility) and part of the physical properties (such as wear resistance, folding resistance) of natural leather, and gradually becomes the mainstream material in the leather replacement field. PU artificial leather has been widely used in shoes and clothes (sports shoes, leather shoes, luggage), home (sofa, seat fabric), automotive interior (seat, door panel decoration) and electronic products (mobile phone case, earphone packaging) fields.

[0003] In the "finishing process" step of the PU artificial leather processing process, "embossing process" is the core step to improve the appearance and touch of the leather surface. The leather to be embossed is uniformly sent into the embossing machine station by a continuous conveying device (such as a conveying net belt, a guide roller group), and the pattern hot press roller (the surface is engraved with target texture, usually made of steel or ceramic to ensure the wear resistance and clarity of the texture) and the smooth support roller (used to support the leather to prevent excessive deformation of the leather during embossing) on the embossing machine are used to press the texture (such as litchi pattern, imitation leather pattern) on the leather surface, which can improve the appearance and imitation leather effect of the product, and meet the sensory needs of the high-end market.

[0004] However, before the embossing process, the surface of PU artificial leather often has dust particles (such as heat insulation fibers falling off in the oven), lint (fibers falling off from the fabric base or conveying net belt) or unhardened PU particles (residual resin on the coating surface that is not completely flat) due to production links (such as coating, curing, conveying).

[0005] The existing embossing machine has insufficient front cleaning treatment of the leather surface before embossing, which leads to the lack of cleaning of the leather surface before embossing. If these impurities are not effectively removed and enter the embossing process, the impurities will be pressed into the PU coating under the action of high temperature and high pressure, forming "raised particles" or "concave spots", which will damage the continuity and smoothness of the texture (such as the disappearance of the three-dimensional effect of the imitation leather pattern, and the surface showing irregular defects), and the impurities will hinder the full contact of the embossing roller and the PU coating, resulting in shallow pattern indentation and blurred edges in the area covered by the impurities, poor appearance consistency of the embossed product, and low yield of the printed product.

[0006] Although the general dust removal equipment (such as a common dust collector, a dust blowing gun) can be used to clean the surface of the leather material, only the surface dust can be removed, and the lint or small dust (particle size < 50 μm) embedded in the gap of the coating layer has poor removal effect. SUMMARY

[0007] In view of the deficiencies in the prior art, the purpose of the present application is to provide a pre-cleaning mechanism of a PU artificial leather embossing machine.

[0008] To achieve the above-mentioned purpose, the present application provides the following technical solutions:

[0009] A pre-cleaning mechanism of a PU artificial leather embossing machine, comprising a rack and a conveying device for conveying the PU artificial leather to be embossed to the embossing machine station, the rack is arranged at the input end of the embossing machine, and the rack is arranged on both sides of the conveying device, a cleaning device is arranged on the rack for cleaning the surface of the PU artificial leather to be embossed conveyed on the conveying device; the cleaning device comprises a cleaning box, an electrostatic eliminator, a negative pressure dust collection module and a dust sticking module; the cleaning box is provided with an inlet and an outlet for the PU artificial leather to pass through; the electrostatic eliminator is arranged in the cleaning box for eliminating static electricity on the surface of the PU artificial leather; the negative pressure dust collection module is arranged in the cleaning box, and the suction port of the negative pressure dust collection module faces the surface of the PU artificial leather to be embossed; the dust sticking module is arranged in the cleaning box, and the dust sticking surface of the dust sticking module is in contact with the surface of the PU artificial leather to be embossed; the electrostatic eliminator, the negative pressure dust collection module and the dust sticking module are arranged in sequence along the conveying direction of the PU artificial leather.

[0010] Further, the dust sticking module comprises a bracket mounted in the cleaning box, a dust sticking roller rotatably connected to the bracket, a feeding rod rotatably connected to the bracket, a collecting rod rotatably connected to the bracket and a servo motor mounted on the bracket for driving the collecting rod to rotate, the feeding rod and the collecting rod are respectively arranged on both sides of the dust sticking roller, a dust sticking film roll is sleeved on the feeding rod, the dust sticking film roll is formed by winding the dust sticking film into a hollow cylindrical shape, the dust sticking film on the dust sticking film roll is wound around the outer periphery of the dust sticking roller and connected to the collecting rod, and the outer periphery of the dust sticking roller is in rolling contact with the surface of the PU artificial leather to be embossed.

[0011] Further, the cleaning box comprises a box door for conveniently opening the cleaning box, the box door corresponds to one end of the feeding rod, one end of the collecting rod and one end of the dust sticking roller, a limiting groove is formed in the box door and matched with one end of the collecting rod, one end of the collecting rod is inserted into the limiting groove on the box door, the other end of the collecting rod is fixedly connected with the output end of the servo motor through the bracket, the other end of the collecting rod is rotatably connected with the bracket through a bearing, and the other end of the feeding rod is rotatably connected to the bracket.

[0012] Further, the negative pressure dust collection module comprises a negative pressure dust collection cover arranged above the embossed surface of the PU artificial leather, a dust collection box communicated with the negative pressure dust collection cover through a pipeline, and a negative pressure fan for generating negative pressure in the negative pressure dust collection cover.

[0013] Further, the dust suction port of the negative pressure dust collection cover is in a slit structure, and the length direction of the slit structure is consistent with the width direction of the PU artificial leather.

[0014] Further, a cleaning brush for roughly cleaning the embossed surface of the PU artificial leather is arranged at the inlet of the cleaning box, and the bristles of the cleaning brush are in contact with the embossed surface of the PU artificial leather.

[0015] Further, a flexible curtain is arranged at the outlet of the cleaning box.

[0016] By adopting the above technical scheme, the static electricity eliminator first neutralizes the static electricity of the embossed surface of the PU artificial leather, fundamentally eliminates the static adsorption force of the fine dust and the light lint, and creates favorable conditions for the subsequent cleaning steps; the negative pressure dust collection module then removes most of the suspended dust, particulate matter and impurities loosened due to the static electricity elimination; and the dust sticking module finally performs "fine treatment" on the surface, effectively sticks and removes the lint and the fine PU particles embedded in the micro gap of the coating through physical contact. Therefore, before the embossing process, the cleaning device realizes the multi-stage pre-cleaning process of "static electricity elimination, negative pressure dust collection and contact dust sticking" on the embossed surface of the PU artificial leather, avoids the impurities on the embossed surface of the PU artificial leather from entering the embossing process in the embosser when the impurities are not effectively removed, and effectively removes the "fine dust with a particle size of less than 50 microns" and the "embedded lint" mentioned in the background art through the multi-stage cleaning process, avoids the impurities on the embossed surface of the PU artificial leather from being pressed into the coating to form "raised particles" or "concave pits" under the action of high temperature and high pressure in the embossing process, ensures the continuity and smoothness of the embossed pattern, and avoids the impurities on the embossed surface of the PU artificial leather from hindering the full contact between the embossing roller and the PU coating, so that the pattern impression in the area covered by the impurities is shallow and the edge is blurred, thereby improving the appearance consistency and yield of the embossed product. BRIEF DESCRIPTION OF DRAWINGS

[0017] Fig. 1 The figure is a structural schematic diagram of an embodiment of the application.

[0018] Fig. 2 The figure is a structural schematic diagram of the dust sticking module and the PU artificial leather.

[0019] Fig. 3 The figure is a structural schematic diagram of the bracket, the dust sticking roller, the feeding rod and the collecting rod.

[0020] Fig. 4 Figure 1 is a schematic diagram of the cooperation structure of the receiving rod and the servo motor.

[0021] In the figure: rack 1, conveying device 2, PU artificial leather 3, embossing machine 4, cleaning device 5, cleaning box body 51, static electricity eliminator 52, negative pressure dust suction module 53 and dust sticking module 54, inlet 511, outlet 512, support 541, dust sticking roller 542, discharging rod 543, receiving rod 544, servo motor 545, dust sticking film roll 5431, box door 513, limiting groove 514, negative pressure dust suction cover 531, dust collecting box 532, negative pressure fan 533, cleaning brush 515, flexible curtain 516. DETAILED DESCRIPTION

[0022] REFERENCE Figs. 1 to 4 Further description of the embodiments of the present application.

[0023] The pre-cleaning mechanism of the PU artificial leather embossing machine comprises a rack 1 and a conveying device 2 for conveying the PU artificial leather 3 to be embossed to the work station of the embossing machine 4. The rack 1 is arranged at the input end of the embossing machine 4 and is arranged across the conveying device 2 on both sides. The rack 1 is provided with a cleaning device 5 for cleaning the surface of the PU artificial leather 3 to be embossed conveyed on the conveying device 2. The cleaning device 5 comprises a cleaning box body 51, a static electricity eliminator 52, a negative pressure dust suction module 53 and a dust sticking module 54. The cleaning box body 51 is provided with an inlet 511 and an outlet 512 for the PU artificial leather 3 to pass through. The static electricity eliminator 52 is arranged in the cleaning box body 51 for eliminating the static electricity on the surface of the PU artificial leather 3. The negative pressure dust suction module 53 is arranged in the cleaning box body 51, and its suction port faces the surface of the PU artificial leather 3 to be embossed. The dust sticking module 54 is arranged in the cleaning box body 51, and its dust sticking surface is in contact with the surface of the PU artificial leather 3 to be embossed. The static electricity eliminator 52, the negative pressure dust suction module 53 and the dust sticking module 54 are arranged in sequence along the conveying direction of the PU artificial leather 3.

[0024] Working principle: The PU artificial leather 3 is placed on the conveying device 2 and guided to pass through the cleaning device 5 and the embossing machine 4. Before embossing, the PU artificial leather 3 is subjected to static electricity elimination, negative pressure dust suction and dust sticking treatment by the dust sticking roller 542 in sequence through the cleaning device 5 to remove the dust, lint and particles and other impurities on the surface. The PU artificial leather 3 subjected to the cleaning treatment is sent into the embossing machine 4 under the action of the conveying device 2 and subjected to embossing by the hot pressure roller and the pressure bearing roller of the embossing machine 4.

[0025] PU artificial leather 3 in the process of passing through the cleaning device 5, PU artificial leather 3 is conveyed by the conveying device 2 into the cleaning box 51 through the inlet 511 of the cleaning box 51, and is conveyed out of the cleaning box 51 through the outlet 512 of the cleaning box 51 under the action of the conveying device 2 to enter the embossing machine 4 work station. When in the cleaning box 51, the static electricity eliminator 52 works to neutralize the static electricity on the surface of the PU artificial leather 3 to be embossed first, fundamentally eliminating the static adsorption force of fine dust and light lint, creating favorable conditions for subsequent cleaning steps; the negative pressure dust collection module 53 removes most of the suspended dust, particles and impurities loosened by static electricity elimination; the dust sticking module 54 works lastly to perform "fine processing" on the surface, effectively sticking the lint and fine PU particles embedded in the coating micro gap that cannot be removed by negative pressure. Thus, before the embossing process, the cleaning device 5 realizes the multi-stage pre-cleaning process of "static electricity elimination → negative pressure dust collection → contact dust sticking" on the surface of the PU artificial leather 3 to be embossed, avoiding the impurities on the surface of the PU artificial leather 3 to be embossed from entering the embossing process in the embossing machine 4 without being effectively removed. This multi-stage cleaning process also effectively removes the "fine dust with particle size <50 μm" and "lint embedded in the gap" mentioned in the background art, avoiding the impurities on the surface of the PU artificial leather 3 to be embossed from being pressed into the coating to form "raised particles" or "concave pits" under the action of high temperature and high pressure in embossing, ensuring the continuity and smoothness of the embossed pattern. It also avoids the impurities on the surface of the PU artificial leather 3 to be embossed from hindering the full contact of the embossing roller with the PU coating, resulting in shallow pattern indentation and blurred edges in the area covered by the impurities, improving the appearance consistency and yield of the embossed product.

[0026] The dust sticking module 54 comprises a support 541 mounted in the cleaning box 51, a dust sticking roller 542 rotationally connected to the support 541, a feeding rod 543 rotationally connected to the support 541, a collecting rod 544 rotationally connected to the support 541, and a servo motor 545 mounted on the support 541 and used for driving the collecting rod 544 to rotate, one end of the dust sticking roller 542 is rotationally connected to the support 541 through a bearing, the other end of the dust sticking roller 542 is rotationally connected to the inner wall of the cleaning box 51 through a bearing, the feeding rod 543 and the collecting rod 544 are respectively arranged on the two sides of the dust sticking roller 542, a dust sticking film roll 5431 is sleeved on the feeding rod 543, the dust sticking film roll 5431 is formed by winding the dust sticking film into a hollow cylindrical shape, the dust sticking film on the dust sticking film roll 5431 is connected to the collecting rod 544 by winding around the outer periphery of the dust sticking roller 542, the dust sticking film is stuck on the collecting rod 544, the collecting rod 544 winds the used dust sticking film under the drive of the servo motor 545, the dust sticking film pulls the feeding rod 543 to rotate, so that the dust sticking film roll 5431 rotates to release the brand-new dust sticking film, the outer periphery of the dust sticking roller 542 is in rolling contact with the surface of the PU artificial leather 3 to be embossed, and the dust sticking film is in a tight state when passing through the outer periphery of the dust sticking roller 542, in order to realize the tight state of the dust sticking film transmission, a certain resistance is arranged at the feeding end, which is a conventional technical means (for example, the feeding rod 543 provides rotational resistance through a damper).

[0027] The conventional fixed dust sticking roller is saturated after being filled with impurities and cannot be replaced in time, so that the dust sticking roller itself becomes a pollution source and may re-smear the captured impurities onto the surface of the PU artificial leather 3, thereby causing secondary pollution.

[0028] The dust sticking film roll 5431 on the feeding rod 543 rotates to release the brand-new dust sticking film under the action of the dust sticking roller 542, the brand-new dust sticking film contacts the surface of the PU artificial leather 3 to be embossed and performs cleaning, and the surface of the dust sticking film that is always in contact with the surface of the PU artificial leather 3 to be embossed is clean and highly adhesive, so that the secondary pollution is avoided, the cleaning of the dust sticking module 54 on the surface of the PU artificial leather 3 is realized, the cleaning effect is stable, and the embossing process can continuously and stably operate at a high yield. The collecting rod 544 automatically winds the used dust sticking film, the embossing process can continuously operate, the dust sticking roller 542 does not need to be cleaned during shutdown, the modern continuous production line requirement is met, and the production efficiency is improved. The operator does not need to frequently open the box to clean or replace the entire dust sticking roller 542, but only needs to replace a new film roll after the entire film roll is used, so that the maintenance frequency and labor intensity are greatly reduced.

[0029] The cleaning box 51 comprises a box door 513 facilitating opening of the cleaning box 51, the box door 513 corresponding to one end of the discharging rod 543, one end of the collecting rod 544 and one end of the dust sticking roller 542, the box door 513 being provided with a limiting groove 514 matched with the one end of the collecting rod 544, the one end of the collecting rod 544 being inserted into the limiting groove 514 of the box door 513, the other end of the collecting rod 544 being fixedly connected with the output end of the servo motor 545 through the bracket 541, the other end of the collecting rod 544 being rotatably connected with the bracket 541 through a bearing, the one end of the discharging rod 543 being abutted against the box door 513, and the other end of the discharging rod 543 being rotatably connected with the bracket 541 through a bearing.

[0030] The discharging rod 543, the collecting rod 544 and the dust sticking roller 542 of the dust sticking module 54 are correspondingly concentrated to form a "maintenance module" corresponding to the box door 513. After the dust sticking film roll 5431 on the discharging rod 543 is used up and the collected dust sticking film waste on the collecting rod 544 is collected, the box door 513 is opened to replace the new dust sticking film roll 5431 on the discharging rod 543, remove the collected dust sticking film waste and the like, so that the structure is intuitive and the operation space is sufficient.

[0031] The one end of the collecting rod 544 is inserted into the limiting groove 514 of the box door 513 to realize quick radial positioning and axial support, so that the alignment and installation can be easily completed when the collecting rod winds the heavy or large-diameter dust sticking film waste, and the operation steps are simplified.

[0032] The negative pressure dust collection module 53 comprises a negative pressure dust collection cover 531 arranged above the embossed surface of the PU artificial leather 3, a dust collection box 532 communicated with the negative pressure dust collection cover 531 through a pipeline and a negative pressure fan 533 for generating negative pressure in the negative pressure dust collection cover 531, the negative pressure fan 533 being communicated with the dust collection box 532, and the dust suction port of the negative pressure dust collection cover 531 being in a slit structure with the length direction consistent with the width direction of the PU artificial leather 3.

[0033] The impurities on the embossed surface of the PU artificial leather 3 are adsorbed by starting the negative pressure fan 533 to generate suction force on the negative pressure dust collection cover 531, and then enter the dust collection box 532 through the pipeline for collection. Compared with the circular or small-size suction port, the dust suction port of the negative pressure dust collection cover 531 is in a slit structure to ensure that there is a stable negative pressure field along the entire width direction of the embossed surface of the PU artificial leather 3, thereby avoiding local cleaning dead angles caused by uneven suction force, and realizing the cleaning of the surface of the PU artificial leather 3 by the negative pressure dust collection module 53.

[0034] The cleaning box 51 is provided with a cleaning brush 515 at the inlet 511 for rough cleaning of the embossed surface of the PU artificial leather 3, the bristles of the cleaning brush 515 being abutted against the embossed surface of the PU artificial leather 3, and the bristles of the cleaning brush 515 being made of anti-static nylon material to avoid accumulation of static electricity on the bristles.

[0035] Through the physical brushing of the cleaning brush 515, the coarse fiber clusters, lint and the like attached to the embossed surface of the PU artificial leather 3 are removed, and the brushing of the cleaning brush 515 can loosen a part of the lint and particles attached by mechanical force in advance, so that they are more easily removed after the subsequent static elimination, thereby reducing the working load of the core cleaning unit.

[0036] A flexible curtain 516 is arranged at the outlet 512 of the cleaning box 51. The flexible curtain 516 can effectively block the floating contaminants in the external environment from entering the cleaning box 51 under the action of the disturbance airflow generated by the negative pressure cleaning module 53, so as to pollute the surface of the PU artificial leather 3 which has been cleaned or other cleaning components in the cleaning box 51.

[0037] In the description of the present application, it should be understood that the orientations or positional relationships indicated by the terms "center", "longitudinal", "transverse", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential" and the like are based on the orientations or positional relationships shown in the drawings, and are only for the convenience of describing the present application and simplifying the description, and therefore cannot be understood as indicating or implying that the devices or elements referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as limiting the present application.

[0038] In the present application, unless otherwise explicitly specified and limited, the terms "arrangement", "installation", "connection", "connection", "fixation" and the like should be understood broadly, for example, they can be fixedly connected, or detachably connected, or integrated; they can be mechanically connected, directly connected, or indirectly connected through an intermediate medium, or the communication between two elements or the interaction relationship between two elements. For those skilled in the art, the specific meanings of the above terms in the present application can be understood according to the specific circumstances.

[0039] The control mode of the present application is automatically controlled by a controller, and the control circuit of the controller can be realized by simple programming by those skilled in the art, and the power supply also belongs to the common knowledge in the art, and the present application is mainly used to protect mechanical devices, so the control mode and circuit connection of the present application will not be explained in detail.

[0040] The above description is only the preferred embodiment of the present application, and is not intended to limit the present application, and those skilled in the art can make usual changes and replacements within the technical solution range of the present application, which should be included in the protection scope of the present application.

Claims

1. A pre-cleaning mechanism of a PU artificial leather embosser, comprising a frame (1) and a conveying device (2) for conveying a PU artificial leather (3) to be embossed to an embosser (4) station, the frame (1) is arranged at the input end of the embosser (4), and the frame (1) is arranged across the conveying device (2) on both sides, characterized in that, a cleaning device (5) is arranged on the frame (1) for cleaning the surface of the PU artificial leather (3) to be embossed conveyed on the conveying device; the cleaning device (5) comprises a cleaning box (51), an electrostatic eliminator (52), a negative pressure dust suction module (53) and a dust sticking module (54); the cleaning box (51) is provided with an inlet (511) and an outlet (512) for the PU artificial leather (3) to pass through; the electrostatic eliminator (52) is arranged in the cleaning box (51) for eliminating static electricity on the surface of the PU artificial leather (3); the negative pressure dust suction module (53) is arranged in the cleaning box (51), and the suction port thereof faces the surface of the PU artificial leather (3) to be embossed; the dust sticking module (54) is arranged in the cleaning box (51), and the dust sticking surface thereof is in contact with the surface of the PU artificial leather (3) to be embossed; the electrostatic eliminator (52), the negative pressure dust suction module (53) and the dust sticking module (54) are sequentially arranged along the conveying direction of the PU artificial leather (3).

2. The pre-cleaning mechanism of the PU artificial leather embossing machine according to claim 1, characterized in that, the dust sticking module (54) comprises a support (541) mounted in the cleaning box (51), a dust sticking roller (542) rotatably connected to the support, a feeding rod (543) rotatably connected to the support (541), a collecting rod (544) rotatably connected to the support (541), and a servo motor (545) mounted on the support (541) for driving the collecting rod (544) to rotate, the feeding rod (543) and the collecting rod (544) are respectively arranged on both sides of the dust sticking roller (542), a dust sticking film roll (5431) is sleeved on the feeding rod (543), the dust sticking film roll (5431) is formed by winding the dust sticking film into a hollow cylinder, the dust sticking film on the dust sticking film roll (5431) is connected to the collecting rod (544) by winding around the outer periphery of the dust sticking roller (542), and the outer periphery of the dust sticking roller (542) is in rolling contact with the surface of the PU artificial leather (3) to be embossed.

3. The pre-cleaning mechanism of the PU artificial leather embossing machine according to claim 2, characterized in that, the cleaning box (51) comprises a box door (513) for conveniently opening the cleaning box (51), the box door (513) corresponds to one end of the feeding rod (543), one end of the collecting rod (544) and one end of the dust sticking roller (542), the box door (513) is provided with a limiting groove (514) matched with one end of the collecting rod (544), one end of the collecting rod (544) is inserted into the limiting groove (514) on the box door (513), the other end of the collecting rod (544) is fixedly connected with the output end of the servo motor (545) through the support (541), the other end of the collecting rod (544) is rotatably connected with the support (541) through a bearing, and the other end of the feeding rod (543) is rotatably connected to the support (541).

4. The pre-cleaning mechanism of the PU artificial leather embossing machine according to claim 3, characterized in that, The negative pressure dust collection module (53) comprises a negative pressure dust collection cover (531) arranged above the embossed surface of the PU artificial leather (3), a dust collection box (532) communicated with the negative pressure dust collection cover (531) through a pipeline, and a negative pressure fan (533) for generating negative pressure in the negative pressure dust collection cover.

5. The pre-cleaning mechanism of the PU artificial leather embossing machine according to claim 4, characterized in that, The dust collection port of the negative pressure dust collection cover (531) is in a slit structure, and the length direction of the slit structure is consistent with the width direction of the PU artificial leather (3).

6. The pre-cleaning mechanism of the PU artificial leather embossing machine according to claim 5, characterized in that, A cleaning brush (515) for roughly cleaning the embossed surface of the PU artificial leather (3) is arranged at the inlet (511) of the cleaning box (51), and the bristles on the cleaning brush (515) are in contact with the embossed surface of the PU artificial leather (3).

7. The pre-cleaning mechanism of the PU artificial leather embossing machine according to claim 6, characterized in that, A flexible curtain (516) is arranged at the outlet (512) of the cleaning box (51).

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