Coating scraper

Abstract

The utility model provides a coating scraper, relates to the technical field of coating machines, and solves the technical problem that the conventional scraper is easy to damage a scraper and a gravure roller during length adjustment and pressure adjustment. The scraper is used for scraping redundant paint on one side of the gravure roller, the connecting cylinder is used for connecting and controlling the scraper to feed, the connecting cylinder is provided with a measuring device used for measuring the distance between the connecting cylinder and the gravure roller on the other side of the gravure roller, and the measuring device is provided with a distance measuring sensor. According to the utility model, the thickness of the coating can be accurately controlled, the uniformity of the coating is ensured, the non-uniformity of the coating is reduced, and the flatness of the coating is improved; the inclined surface of the inverted trapezoid is pushed by the groove of the gravure roller to extend out of the groove, so that the scraper and the gravure roller are effectively prevented from being damaged; and the device can adapt to different types of coatings and base materials, and the universality and adaptability of the device are improved.

Description

TECHNICAL FIELD

[0001] The utility model relates to the technical field of coating machine, specifically, relate to a coating doctor blade. BACKGROUND

[0002] Gravure coating is a commonly used high-precision coating method, widely used in printing, packaging, electronics, medical and other fields. Gravure coating transfers paint to the substrate through a cylinder engraved with patterns (gravure cylinder), with uniform coating, fine pattern and other characteristics. Among them, the doctor blade device is one of the key components in gravure coating, used to control the thickness and quality of the coating. The surface of the gravure cylinder is engraved with tiny pits (called cells), which are used to store paint. The paint is delivered to the surface of the gravure cylinder by pump and pipeline. The doctor blade is installed on one side of the gravure cylinder, used to scrape off the excess paint, leaving only the paint in the pits. When the substrate passes through the gravure cylinder, the paint in the pits is transferred to the substrate, forming a coating.

[0003] The doctor blade is usually made of hard material (such as ceramic, tungsten carbide, etc.), with high wear resistance and corrosion resistance. The doctor blade holder is used to fix and adjust the position and angle of the doctor blade. The pressure adjusting system adjusts the pressure of the doctor blade on the gravure cylinder through air cylinder or spring mechanism, to control the thickness of the coating. By adjusting the pressure and angle of the doctor blade, the thickness of the coating can be accurately controlled, ensuring the uniformity of the coating. The doctor blade can effectively remove the excess paint on the surface of the gravure cylinder, preventing the coating from being too thick or uneven. The doctor blade device can reduce defects such as bubbles and stripes, improving the quality and appearance of the coating.

[0004] Long-term use will cause the doctor blade to wear out, affecting the uniformity and quality of the coating. Therefore, the doctor blade needs to be checked and replaced regularly. The pressure of the doctor blade on the gravure cylinder needs to be accurately controlled, excessive pressure will damage the gravure cylinder, and insufficient pressure will cause uneven coating.

[0005] Therefore, as disclosed in patent CN106626726A, a new gravure printing coating device is proposed, which realizes the adjustment of the fitting pressure of the upper doctor blade and the gravure roller, and realizes the ink coating technology above millimeter thickness, with high coating precision, uniform thickness and smooth surface without scratches. However, the device adjusts the pressure of the doctor blade through the spring, when the groove of the gravure rotates to the doctor blade, the doctor blade is easily stretched into the groove due to the elastic expansion of the spring, causing damage to the gravure roller and the doctor blade. SUMMARY

[0006] The utility model aims at providing a coating doctor blade to solve the technical problem that the existing doctor blade is easy to cause damage to the doctor blade and the gravure roller when adjusting the length pressure type.

[0007] The embodiment of the utility model realizes through the following technical scheme

[0008] A coating doctor blade, comprising a doctor blade for scraping off excess coating on one side of a gravure roll, further comprising a connecting cylinder for connecting to control the doctor blade, the connecting cylinder is provided with a measuring device for measuring the distance between the other side of the gravure roll and the gravure roll, and the measuring device is provided with a distance measuring sensor.

[0009] Preferably, the doctor blade comprises an upper doctor blade and a lower doctor blade connected to a doctor blade seat, and the upper doctor blade and the lower doctor blade are provided as right-angle inverted trapezoids.

[0010] Preferably, the upper doctor blade is rotatably connected to the doctor blade seat through a rotating part, and the slope of the inverted trapezoid of the upper doctor blade is smaller than the slope of the lower doctor blade.

[0011] Preferably, a reset spring is arranged in the rotating part for controlling the rotation reset of the upper doctor blade.

[0012] Preferably, the doctor blade seat is further provided with a connecting hole for threadedly connecting the connecting cylinder, and the connecting cylinder passes through the lower doctor blade.

[0013] Preferably, the connecting cylinder is provided with a lead screw for controlling the radial movement of the connecting cylinder relative to the gravure roll, the lead screw is connected to the doctor blade seat and the measuring device, and the lead screw is further connected to a stepping motor for controlling the rotation of the lead screw.

[0014] Preferably, the doctor blade further comprises a coating tank for storing coating, and the coating tank is provided with a first bearing seat and a second bearing seat for rotatably connecting the lead screw.

[0015] By measuring the distance between the gravure roll and the doctor blade in real time, the thickness of the coating can be accurately controlled, and the uniformity of the coating can be ensured. The surface of the gravure roll can be better adapted, the unevenness of the coating can be reduced, and the flatness of the coating can be improved. The upper doctor blade can be finely adjusted through the rotating part, and the reset spring ensures that the upper doctor blade always maintains the best contact with the gravure roll, thereby reducing the generation of bubbles and stripes. The reset spring cooperates with the inverted trapezoidal upper doctor blade to make the upper doctor blade fit the curved surface of the gravure roll. The upper edge of the inverted trapezoidal upper doctor blade extends into the groove of the gravure roll, and with the rotation of the gravure roll, the inclined surface of the inverted trapezoidal upper doctor blade will also be pushed out of the groove by the groove of the gravure roll, thereby effectively preventing the doctor blade and the gravure roll from being damaged.

[0016] By controlling the rotation of the lead screw through the stepper motor, the automatic adjustment of the doctor blade in the radial direction of the gravure roll can be achieved, reducing manual intervention and improving production efficiency. The combination of real-time measurement and automatic adjustment can quickly respond to changes in coating thickness, ensuring the stability and continuity of the production process. By precisely controlling the position and angle of the doctor blade, excess coating can be effectively removed, reducing material waste. Through the combination of the lead screw and the stepper motor, the position and angle of the doctor blade can be flexibly adjusted to adapt to the coating requirements of different thicknesses and materials. By designing different slopes, different types of coatings and substrates can be adapted, improving the versatility and adaptability of the equipment.

[0017] Through precise measurement and control, the quality and production efficiency of the coating are improved, material waste is reduced, and the stability and reliability of the equipment are improved, while having good adaptability and versatility.

[0018] The technical scheme of the utility model embodiment has at least the following advantages and beneficial effects:

[0019] 1、The utility model discloses can control the thickness of coating accurately, ensure that coating is uniform, reduce the unevenness of coating, improve the flatness of coating;

[0020] 2、The utility model discloses the slope of inverted trapezoid also will be pushed out the groove of the groove of gravure roll and extend the groove, effectively prevent the damage of doctor blade and gravure roll;

[0021] 3、The utility model discloses can adapt to different types of coatings and substrates, improve the versatility and adaptability of the equipment. DRAWINGS

[0022] In order to more clearly illustrate the technical scheme of the utility model embodiment, the following will be briefly introduced to the drawings needed to be used in the embodiment, and it should be understood that the following drawings only show some embodiments of the utility model, and therefore should not be regarded as the limitation to the scope, for the ordinary skilled person in the art, under the premise of not paying the creative labor, still can obtain other related drawings according to these drawings.

[0023] Figure 1 The side surface structure schematic diagram of the coating doctor provided for the utility model embodiment 1 is shown;

[0024] Figure 2 The side surface structure schematic diagram of the doctor of the coating doctor provided for the utility model embodiment 2 is shown;

[0025] Figure 3 The back surface structure schematic diagram of the doctor of the coating doctor provided for the utility model embodiment 2 is shown;

[0026] Figure 4 The working principle schematic diagram of the doctor of the coating doctor provided for the utility model embodiment 2 is shown.

[0027] Icon: 1, gravure roll; 4, doctor blade; 41, upper doctor blade; 42, doctor blade seat; 421, connecting hole; 43, lower doctor blade; 44, rotating part; 441, return spring; 5, measuring device; 51, distance measuring sensor; 6, connecting cylinder; 7, lead screw; 8, stepper motor; 2, paint tank; 31, first bearing seat; 32, second bearing seat. DETAILED DESCRIPTION

[0028] In order to make the purpose, technical scheme and advantages of the embodiments of the present application clearer, the technical scheme in the embodiments of the present application will be described clearly and completely below in conjunction with the drawings in the embodiments of the present application. Obviously, the described embodiments are part of the embodiments of the present application, rather than all the embodiments of the present application. The components of the embodiments of the present application described and shown in the drawings herein can be arranged and designed in various different configurations.

[0029] Therefore, the following detailed description of the embodiments of the present application provided in the drawings is not intended to limit the scope of the claimed present application, but only represents selected embodiments of the present application. Based on the embodiments in the present application, all other embodiments obtained by those of ordinary skill in the art without making creative efforts fall within the scope of the present application.

[0030] It should be noted that: similar reference numbers and letters represent similar items in the following drawings, therefore, once an item is defined in one drawing, it does not need to be further defined and explained in subsequent drawings.

[0031] In the description of the present application, it should be noted that, if the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer" and the like indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings, or the orientation or positional relationship when the product of the application is usually placed, which is only for the convenience of describing the present application and simplifying the description, and therefore cannot be understood as indicating or implying that the indicated device or element must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as limiting the present application.

[0032] In the description of the present application, it should also be noted that, unless otherwise explicitly specified and limited, if the terms "set", "mount", "connected", "connected" appear, they should be understood in a broad sense, for example, they can be fixedly connected, or can be detachably connected, or integrally connected; can be mechanically connected, or can be electrically connected; can be directly connected, or can be indirectly connected through an intermediate medium; can be connected inside two elements. For those of ordinary skill in the art, the specific meaning of the above terms in the present application can be understood according to the specific circumstances.

[0033] Embodiment 1

[0034] A coating doctor blade, comprising a doctor blade 4 to remove excess coating on one side of the gravure roller 1, and a connecting cylinder 6 to connect the control of the doctor blade 4, the connecting cylinder 6 is provided with a measuring device 5 to measure the distance between the other side of the gravure roller 1 and the gravure roller 1, the measuring device 5 is provided with a distance sensor 51.

[0035] In this embodiment, the connecting cylinder 6 is provided with a lead screw 7 to control its radial movement of the gravure roller 1, the lead screw 7 connects the doctor blade seat 42 and the measuring device 5, the lead screw 7 is also connected with a stepping motor 8 to control its rotation.

[0036] In this embodiment, it also includes a coating tank 2 to store the coating, the coating tank 2 is provided with a first bearing seat 31 and a second bearing seat 32 to rotate the connecting lead screw 7.

[0037] With this technical solution, by measuring the distance between the gravure roller 1 and the doctor blade 4 in real time, the thickness of the coating can be accurately controlled, and the uniformity of the coating can be ensured. It can better adapt to the surface of the gravure roller 1, reduce the unevenness of the coating, and improve the flatness of the coating. The upper doctor blade 41 can be adjusted by the rotating part 44, and the reset spring 441 ensures that it always maintains the best contact with the gravure roller 1, reducing the generation of bubbles and stripes. And the reset spring 441 cooperates with the inverted trapezoidal upper doctor blade 41, so that the upper doctor blade 41 fits the curved surface of the gravure roller 1, and the upper edge of the inverted trapezoidal upper doctor blade 41 extends into the groove of the gravure roller 1. With the rotation of the gravure roller 1, the inclined surface of the inverted trapezoidal upper doctor blade 41 will also be pushed out of the groove by the groove of the gravure roller 1, effectively preventing the doctor blade 4 and the gravure roller 1 from being damaged.

[0038] By controlling the rotation of the lead screw 7 with the stepping motor 8, the automatic adjustment of the doctor blade 4 in the radial direction of the gravure roller 1 can be realized, reducing manual intervention and improving production efficiency. The combination of real-time measurement and automatic adjustment can quickly respond to changes in coating thickness, ensuring the stability and continuity of the production process. By accurately controlling the position and angle of the doctor blade 4, excess coating can be effectively removed, reducing material waste. Through the combination of the lead screw 7 and the stepping motor 8, the position and angle of the doctor blade 4 can be flexibly adjusted to adapt to the coating requirements of different thicknesses and different materials. Through different slope designs, different types of coatings and substrates can be adapted to improve the versatility and adaptability of the equipment.

[0039] Embodiment 2

[0040] The difference between this embodiment and embodiment 1 is that in this embodiment, the doctor blade 4 includes an upper doctor blade 41 and a lower doctor blade 43 connected to the doctor blade seat 42, and the upper doctor blade 41 and the lower doctor blade 43 are designed as right-angle inverted trapezoids.

[0041] In the embodiment, the upper scraper 41 is rotatably connected to the scraper seat 42 by the rotary part 44, and the slope gradient of the inverted trapezoidal bevel of the upper scraper 41 is smaller than that of the lower scraper 43.

[0042] In the embodiment, the rotary part 44 is provided with a reset spring 441 for controlling the rotation reset of the upper scraper 41.

[0043] In the embodiment, the scraper seat 42 is further provided with a connecting hole 421 for threadedly connecting the connecting cylinder 6, and the connecting cylinder 6 penetrates through the lower scraper 43.

[0044] The above is only the preferred embodiment of the present application, and is not used to limit the present application. For those skilled in the art, the present application can have various changes and modifications. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present application shall be included in the protection scope of the present application.

Claims

1. A coating doctor comprising a doctor blade (4) to remove excess coating material on one side of a gravure roll (1), characterized in that: Also include a connecting cylinder (6) to control the entry of the scraper (4), the connecting cylinder (6) is provided with a measuring device (5) to measure the distance between the other side of the gravure roller (1) and the gravure roller (1), the measuring device (5) is provided with a distance sensor (51).

2. A coating blade according to claim 1, characterized in that: The scraper (4) includes an upper scraper (41) and a lower scraper (43) connected to the scraper seat (42), the upper scraper (41) and the lower scraper (43) are provided as a right angle inverted trapezoid.

3. A coating blade according to claim 2, wherein: The upper scraper (41) is rotatably connected to the scraper seat (42) by being provided with a rotating part (44), and the slope of the inverted trapezoidal bevel thereof is smaller than that of the lower scraper (43).

4. A coating blade according to claim 3, wherein: The rotating part (44) is provided with a reset spring (441) to control the rotation reset of the upper scraper (41).

5. A coating blade according to any one of claims 2 to 4, characterised in that: The scraper seat (42) is also provided with a connecting hole (421) to threadedly connect the connecting cylinder (6), and the connecting cylinder (6) passes through the lower scraper (43).

6. A coating blade according to any one of claims 2 to 4, wherein: The connecting cylinder (6) is provided with a lead screw (7) to control its radial movement on the gravure roller (1), the lead screw (7) connects the scraper seat (42) and the measuring device (5), and the lead screw (7) is also shaft connected with a stepping motor (8) to control its rotation.

7. A coating blade according to claim 6, wherein: Also include a paint tank (2) to store paint, the paint tank (2) is provided with a first bearing seat (31) and a second bearing seat (32) to rotatably connect the lead screw (7).

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