A closed-type constant spacing adjustment device for scrapers

Abstract

This utility model belongs to the technical field of printing and coating equipment, specifically relating to a closed-type constant gap adjustment device for doctor blades. The utility model includes: a coating roller assembly, comprising a coating anilox roller; a doctor blade assembly, comprising two doctor blades in contact with the coating anilox roller; a support assembly, comprising a base plate; two drive assemblies symmetrically arranged on the base plate, each drive assembly comprising a cylinder; wherein the extension and retraction ends of the two cylinders are connected to the doctor blade assembly; and a main control module electrically connected to the two cylinders. The main control module of this closed-type constant gap adjustment device controls the cylinders to extend, causing the cylinders to move the doctor blade assembly so that the doctor blades contact the coating anilox roller. As the doctor blades gradually wear down, the gap between the doctor blades and the coating anilox roller gradually increases. Based on feedback data from multiple sources, the main control module automatically generates a compensation distance for the cylinders and controls the cylinders to extend, thereby achieving real-time automatic compensation after doctor blade wear and maintaining a constant gap between the doctor blades and the coating anilox roller.

Description

Technical Field

[0001] This utility model belongs to the technical field of printing and coating equipment, specifically relating to a closed-type constant spacing adjustment device for doctor blades. Background Technology

[0002] In the printing and coating industry, closed-loop doctor blade systems are widely used to control coating thickness and uniformity. With the development of high-speed coating technology, the requirements for coating precision are getting higher and higher. At present, the industry generally uses anilox rollers and doctor blades to achieve coating. The wear of doctor blades has become a key factor affecting coating quality.

[0003] Existing technologies primarily employ manual adjustment of the gap between the doctor blade and the anilox roller. This is achieved by rotating a lead screw to adjust the doctor blade position and then pressing it down with a cylinder to ensure the doctor blade is firmly pressed against the coating anilox roller. While this method meets the initial coating requirements, the doctor blade position remains fixed, making automatic compensation for blade wear impossible. Furthermore, this method requires frequent manual intervention, making it difficult to maintain a constant doctor blade gap during continuous production.

[0004] Therefore, in order to solve the above problems, it is necessary to design a closed-loop constant spacing adjustment device for scrapers. Utility Model Content

[0005] The purpose of this invention is to provide a closed-loop constant spacing adjustment device for scrapers to solve the technical problems mentioned in the background art.

[0006] To solve the above-mentioned technical problems, this utility model provides a closed-loop constant gap adjustment device for scrapers, comprising: A coating roller assembly, comprising: a coating anilox roller; A doctor blade assembly comprising: two doctor blades in contact with a coating anilox roller; Support components, including: a base plate; Two drive assemblies symmetrically arranged on the base plate, each drive assembly including: a cylinder; wherein The telescopic ends of the two cylinders are connected to the scraper assembly; The main control module is electrically connected to the two cylinders; among which... The main control module is adapted to determine the wear level of the scraper based on the working time and control the extension and retraction length of the cylinder so that the scraper contacts the coating anilox roller.

[0007] Furthermore, the support assembly further includes: a first support plate disposed at both ends of the base plate and a second support plate disposed at both ends of the base plate; wherein The two cylinders are fixed on the corresponding second support plates; The drive assembly further includes: two guide rails disposed on the first support plate, sliders slidably connected to the guide rails, and a topless box connected to the two sliders; wherein The telescopic end of the cylinder is connected to the topless box; and The two topless boxes are connected to the scraper assembly; The cylinder is adapted to move the topless box during extension and retraction. The topless box drives the slider to slide on the guide rail, and the topless box drives the scraper assembly to move so that the scraper contacts the coating anilox roller.

[0008] Furthermore, the support assembly further includes: a limiting block disposed inside the first support plate; wherein The limiting block is located inside the topless box; The drive assembly further includes: a support base disposed on the outside of the topless box, a reducer disposed on the outside of the support base, a servo motor connected to the reducer, a threaded sleeve embedded in the side of the topless box, a lead screw threadedly connected to the threaded sleeve, and a coupling disposed within the support base; wherein The two ends of the coupling are connected to the reducer and the lead screw; The other end of the lead screw abuts against the limiting block; The main control module is electrically connected to the servo motor; and The servo motor is adapted to drive the lead screw to rotate via a reducer and a coupling. The lead screw engages with a threaded sleeve to move the lead screw back and forth and to abut against the lead screw.

[0009] Furthermore, the coating roller assembly further includes: bearing seats sleeved at both ends of the coating anilox roller; wherein The bearing housing is connected to the coating anilox roller bearing; and The bearing housing is adapted to be fixed on the machine base to install the coating anilox roller into the working position.

[0010] Furthermore, the doctor blade assembly also includes: a blade holder disposed on one side of the coating anilox roller and pressure plates disposed on the upper and lower sides of the blade holder; wherein The two scrapers are respectively fixed on their respective pressure plates; and The scraper and scraper holder form a scraper cavity when they come into contact with the coating anilox roller.

[0011] Furthermore, the scraper assembly also includes: fixing seats disposed at both ends of the blade holder; The drive assembly further includes: a connector for connection to the set-top box; wherein The other side of the connector is connected to the fixed base.

[0012] Furthermore, the scraper assembly also includes a reinforcing member disposed on the blade holder.

[0013] The beneficial effects of this utility model are: (I) The main control module of this utility model controls the extension of the cylinder, which drives the doctor blade assembly to move so that the doctor blade contacts the coating anilox roller. During the actual coating process, the coating anilox roller rotates continuously, and the friction between its surface and the doctor blade causes the doctor blade to wear gradually. The distance between the doctor blade and the coating anilox roller gradually increases. The main control module automatically generates the compensation distance of the cylinder based on feedback data such as working time, visual data and coating thickness, and controls the extension of the cylinder, thereby achieving real-time automatic compensation after the doctor blade wears and maintaining a constant distance between the doctor blade and the coating anilox roller.

[0014] (II) In the initial state of this utility model, the main control module controls the cylinder to continuously extend, pushing the topless box to move. The topless box slides on the guide rail via a slider, thereby driving the scraper assembly to move towards the coating anilox roller until the scraper contacts the surface of the coating anilox roller, completing the initial positioning. At the same time, the servo motor drives the lead screw to rotate through the reducer and coupling, so that the lead screw abuts against the limit block, preventing the scraper on the scraper assembly from excessively contacting the coating anilox roller under the action of the cylinder. During the coating and compensation adjustment process, the coating anilox roller rotates continuously, and the friction between its surface and the scraper causes the scraper to gradually wear down, and the gap between the scraper and the coating anilox roller gradually increases. The main control module provides real-time feedback based on working time, visual data, coating thickness, and other factors. The system automatically generates rotation data for the servo motor and controls its rotation. The servo motor drives the lead screw to rotate via a reducer and coupling. The lead screw is threadedly connected to the threaded sleeve on the topless box, causing it to retract. The retraction distance matches the calculated wear amount. Simultaneously, the cylinder continuously pushes the topless box to move, which in turn moves the doctor blade assembly. This ensures that the doctor blade maintains a constant distance from the coating anilox roller even after wear. During this process, the cylinder continuously provides stable thrust to ensure that the doctor blade and coating anilox roller always maintain the preset distance. The limit block restricts the maximum movement by abutting against the lead screw, preventing over-adjustment. Through the above description, real-time automatic compensation after doctor blade wear is achieved, maintaining a constant distance between the doctor blade and coating anilox roller.

[0015] Other features and advantages of this invention will be set forth in the description which follows, and will be apparent in part from the description, or may be learned by practicing the invention. The objectives and other advantages of this invention are realized and obtained through the structures particularly pointed out in the description and the accompanying drawings.

[0016] To make the above-mentioned objectives, features and advantages of this utility model more apparent and understandable, preferred embodiments are described below in detail with reference to the accompanying drawings. Attached Figure Description

[0017] To more clearly illustrate the specific embodiments of this utility model or the technical solutions in the prior art, the drawings used in the description of the specific embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are some embodiments of this utility model. For those skilled in the art, other drawings can be obtained from these drawings without creative effort.

[0018] Figure 1 This is an exploded view of a preferred embodiment of the present invention. Figure 2 yes Figure 1 Enlarged view of region A in the middle; Figure 3 The three-dimensional representation of the preferred embodiment of this utility model. Figure 1 ; Figure 4 yes Figure 3 Enlarged view of region B in the middle; Figure 5 This is a partial exploded view of a preferred embodiment of the scraper assembly of this utility model; Figure 6 The three-dimensional representation of the preferred embodiment of this utility model. Figure 2 .

[0019] In the picture: Coating roller assembly 1, coating anilox roller 101, bearing housing 102; Scraper assembly 2, scraper 201, blade holder 202, pressure plate 203, sealing baffle 204, fixing base 205, reinforcing member 206; Support component 3, base plate 301, first support plate 302, second support plate 303, limit block 304; Drive assembly 4, cylinder 401, guide rail 402, slider 403, top box 404, support base 405, reducer 406, servo motor 407, threaded sleeve 408, lead screw 409, coupling 410, connector 411. Detailed Implementation

[0020] To make the objectives, technical solutions, and advantages of the embodiments of this utility model clearer, the technical solutions of this utility model will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this utility model, not all embodiments. Based on the embodiments of this utility model, all other embodiments obtained by those skilled in the art without creative effort are within the protection scope of this utility model. Example 1

[0021] like Figures 1 to 6As shown, this embodiment provides a closed-loop constant spacing adjustment device for scrapers, including: The coating roller assembly 1 includes a coating anilox roller 101; a doctor blade assembly 2 includes two doctor blades 201 that contact the coating anilox roller 101; a support assembly 3 includes a base plate 301; two drive assemblies 4 symmetrically arranged on the base plate 301, each drive assembly 4 including a cylinder 401; wherein the extension and retraction ends of the two cylinders 401 are connected to the doctor blade assembly 2; and a main control module electrically connected to the two cylinders 401; wherein the main control module is adapted to determine the wear degree of the doctor blades 201 based on the working time and control the extension and retraction of the cylinders 401. The doctor blade 201 is positioned so that it contacts the coating anilox roller 101. The doctor blade 201 contacts the coating anilox roller 101 to scrape off excess coating from its surface, thereby controlling the coating thickness. The main control module uses, but is not limited to, PLC control. In addition to judging the wear of the doctor blade 201 based on the working time, the main control module can also automatically generate the compensation distance of the cylinder 401 and control the extension of the cylinder 401 by monitoring the distance between the doctor blade 201 and the coating anilox roller 101 and the coating thickness in real time based on the feedback data from the vision component.

[0022] In this embodiment, the main control module controls the cylinder 401 to extend, and the cylinder 401 drives the doctor blade assembly 2 to move so that the doctor blade 201 contacts the coating anilox roller 101. During the actual coating process, the coating anilox roller 1 rotates continuously, and the friction between its surface and the doctor blade 201 causes the doctor blade 201 to gradually wear down, and the distance between the doctor blade 201 and the coating anilox roller 1 gradually increases. The main control module automatically generates the compensation distance of the cylinder 401 based on feedback data such as working time, visual data, and coating thickness, and controls the cylinder 401 to extend, thereby achieving real-time automatic compensation after the doctor blade 201 wears down and maintaining a constant distance between the doctor blade 201 and the coating anilox roller 101.

[0023] The support assembly 3 further includes: a first support plate 302 disposed at both ends of the base plate 301 and a second support plate 303 disposed at both ends of the base plate 301; wherein the two cylinders 401 are fixed on the corresponding second support plates 303; the drive assembly 4 further includes: two guide rails 402 disposed on the first support plate 302, a slider 403 slidably connected to the guide rails 402, and a topless box 404 connected to the two sliders 403; wherein the telescopic end of the cylinder 401 is connected to the topless box 404; and the two topless boxes 404 are connected to the scraper assembly 2; the cylinder 401 is adapted to drive the topless box 404 to move during telescopic movement, the topless box 404 drives the slider 403 to slide on the guide rail 402, and the topless box 404 drives the scraper assembly 2 to move so that the scraper 201 contacts the coating anilox roller 101; wherein by setting the guide rails 402 and the sliders 403, the movement trajectory of the topless box 404 and the scraper assembly 2 is ensured, thereby improving the adjustment accuracy.

[0024] The support assembly 3 further includes: a limiting block 304 disposed inside the first support plate 302; wherein the limiting block 304 is located inside the topless box 404; the drive assembly 4 further includes: a support base 405 disposed outside the topless box 404, a reducer 406 disposed outside the support base 405, a servo motor 407 connected to the reducer 406, a threaded sleeve 408 embedded on the side of the topless box 404, a lead screw 409 threadedly connected to the threaded sleeve 408, and a coupling 410 disposed inside the support base 405; wherein both ends of the coupling 410 are connected to the reducer 406 and the lead screw 409; the lead screw 409 is threadedly connected to the reducer 406 and the lead screw 409. The other end of rod 409 abuts against limit block 304; the main control module is electrically connected to servo motor 407; and the servo motor 407 is adapted to drive lead screw 409 to rotate via reducer 406 and coupling 410, lead screw 409 meshing with threaded sleeve 408, so that lead screw 409 moves back and forth and abuts against lead screw 409; wherein limit block 304 is used to limit scraper assembly 2 to avoid scraper 201 from excessively contacting coating anilox roller 101 under the action of cylinder 401, affecting coating thickness and aggravating scraper 201 wear; wherein by setting reducer 406 and servo motor 407, servo motor 407 provides precise rotational power, while the reducer 406 lowers the rotational speed and increases the torque, achieving precise rotational control of the lead screw 409. It is the core power component for precisely adjusting the position of the scraper 201. The coupling 410 is preferably a telescopic coupling; the telescopic coupling may be, but is not limited to, a perforated coupling. The purpose of using a telescopic coupling is to provide some distance compensation. When the servo motor 407 drives the lead screw 409 to rotate via the reducer 406, it does not affect the small-distance movement of the lead screw 409 on the threaded sleeve 408, thus properly compensating for the wear of the scraper 201 (e.g., when the coupling...). When the distance is at its longest, the lead screw 409 is at its longest length within the topless box 404, and the lead screw 409 abuts against the limit block 304. The movement distance of the topless box 404 is the shortest, and the compensation of the scraper assembly 2 is relatively small. When the scraper 201 wears, the servo motor 407 drives the lead screw 409 to rotate through the reducer 406 and coupling 410. The lead screw 409 is threadedly connected to the threaded sleeve 408, and the lead screw 409 gradually shortens within the topless box 404. The coupling 410 also gradually shortens, and the movement distance of the topless box 404 gradually increases. The compensation of the scraper assembly 2 gradually increases, so that the scraper 201 maintains a constant gap even after wear.

[0025] In this embodiment, in the initial state, the main control module controls the telescopic end of the cylinder 401 to continuously extend, pushing the topless box 404 to move. The topless box 404 slides on the guide rail 402 via the slider 403, thereby driving the scraper assembly 2 to move towards the coating anilox roller 101 until the scraper 201 contacts the surface of the coating anilox roller 101, completing the initial positioning. At the same time, the servo motor 407 drives the lead screw 409 to rotate through the reducer 406 and the coupling 410, so that the lead screw 409 abuts against the limit block 304, preventing the scraper 201 on the scraper assembly 2 from excessively contacting the coating anilox roller 101 under the action of the cylinder 401. During the coating and compensation adjustment process, the coating anilox roller 101 rotates continuously. Friction between its surface and the doctor blade 201 causes the doctor blade 201 to gradually wear down, increasing the distance between them. The main control module automatically generates rotation data for the servo motor 407 based on real-time feedback data from various sources, including working time, visual data, and coating thickness. The servo motor 407 then controls its rotation. The servo motor 407 drives the lead screw 409 to rotate via the reducer 406 and coupling 410. The lead screw 409 is threadedly connected to the threaded sleeve 408 on the topless box 404, causing it to retract. The retraction distance... The wear is consistent with the calculated amount, and the cylinder 401 continuously pushes the topless box 404 to move. The topless box 404 drives the doctor blade assembly 2 to move, so that the doctor blade 201 still maintains a constant distance from the coating anilox roller 101 after wear. During this process, the cylinder 401 continuously provides a stable thrust to ensure that the doctor blade 201 and the coating anilox roller 101 always maintain a preset distance. The limit block 304 limits the maximum movement by abutting against the lead screw 409 to avoid over-adjustment. Through the above description, real-time automatic compensation after the wear of the doctor blade 201 is achieved, maintaining a constant distance between the doctor blade 201 and the coating anilox roller 101.

[0026] The coating roller assembly 1 further includes: bearing seats 102 sleeved at both ends of the coating anilox roller 101; wherein the bearing seats 102 are connected to the bearings of the coating anilox roller 101; and the bearing seats 102 are adapted to be fixed on the machine base to install the coating anilox roller 101 in the working position; wherein by setting the bearing seats 102 sleeved at both ends of the coating anilox roller 101 and connected to the coating anilox roller 101 through bearings, the coating anilox roller 101 is stably supported and fixed in the working position, ensuring its coaxiality and stability during rotation, and avoiding the impact of vibration on coating accuracy.

[0027] The doctor blade assembly 2 further includes: a blade holder 202 disposed on one side of the coating anilox roller 101 and pressure plates 203 disposed on the upper and lower sides of the blade holder 202; wherein the two doctor blades 201 are respectively fixed on the corresponding pressure plates 203; and a doctor blade cavity is formed when the doctor blades 201 and the blade holder 202 come into contact with the coating anilox roller 101; wherein the pressure plates 203 fix the doctor blades 201 on the blade holder 202 through a slot or clamping structure to ensure that the doctor blades 201 are stable in position during operation and to avoid the doctor blades 201 from loosening or shifting due to vibration or friction; wherein the doctor blades 201, the coating anilox roller 101, the pressure plates 203 and the blade holder 202 are arranged together to form a doctor blade cavity to reduce paint leakage, improve paint utilization and reduce pollution.

[0028] The scraper assembly 2 further includes: fixed seats 205 disposed at both ends of the blade holder 202; the drive assembly 4 further includes: a connector 411 connected to the topless box 404; wherein the other side of the connector 411 is connected to the fixed seat 205; wherein the connection between the connector 411 and the fixed seat 205 is achieved through the connection between the drive assembly 4 and the scraper assembly 2, thereby ensuring efficient power transmission.

[0029] The scraper assembly 2 further includes a reinforcing member 206 disposed on the scraper holder 202; wherein by installing the reinforcing member 206 on the scraper holder 202, the structural strength and rigidity of the scraper holder 202 are enhanced, the scraper holder 202 is prevented from deforming when pushed by the drive assembly 4 or during long-term operation, and the stability of the scraper 201 adjustment is guaranteed.

[0030] All the devices selected in this application (parts whose specific structures are not specified) are general standard parts or parts known to those skilled in the art. Their structures and principles can be learned by those skilled in the art through technical manuals or conventional experimental methods.

[0031] In the description of the embodiments of this utility model, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "linking" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model based on the specific circumstances.

[0032] In the description of this utility model, it should be noted that the terms "center," "upper," "lower," "left," "right," "vertical," "horizontal," "inner," and "outer," etc., indicating the orientation or positional relationship, are based on the orientation or positional relationship shown in the accompanying drawings and are only for the convenience of describing this utility model 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, and therefore should not be construed as a limitation of this utility model. Furthermore, the terms "first," "second," and "third" are used for descriptive purposes only and should not be construed as indicating or implying relative importance.

[0033] In the several embodiments provided in this application, it should be understood that the disclosed systems, apparatuses, and methods can be implemented in other ways. The apparatus embodiments described above are merely illustrative. For example, the division of units is only a logical functional division, and in actual implementation, there may be other division methods. Furthermore, multiple units or components may be combined or integrated into another system, or some features may be ignored or not executed. Additionally, the shown or discussed mutual couplings, direct couplings, or communication connections may be through some communication interfaces; indirect couplings or communication connections between devices or units may be electrical, mechanical, or other forms.

[0034] The units described as separate components may or may not be physically separate. The components shown as units may or may not be physical units; that is, they may be located in one place or distributed across multiple network units. Some or all of the units can be selected to achieve the purpose of this embodiment according to actual needs.

[0035] In addition, in the various embodiments of this utility model, each functional unit can be integrated into one processing unit, or each unit can exist physically separately, or two or more units can be integrated into one unit.

[0036] Based on the above-described preferred embodiments of this utility model, and through the foregoing description, those skilled in the art can make various changes and modifications without departing from the technical concept of this utility model. The technical scope of this utility model is not limited to the contents of the specification, but must be determined according to the scope of the claims.

Claims

1. A closed-loop constant spacing adjustment device for scrapers, characterized in that, include: Coating roller assembly (1), which includes: coating anilox roller (101); The doctor blade assembly (2) includes two doctor blades (201) that are in contact with the coating anilox roller (101). Support component (3), which includes: base plate (301); Two drive assemblies (4) are symmetrically arranged on the base plate (301), each drive assembly (4) including: a cylinder (401); wherein The telescopic ends of the two cylinders (401) are connected to the scraper assembly (2); The main control module is electrically connected to the two cylinders (401); among which The main control module is adapted to determine the wear degree of the scraper (201) based on the working time and control the extension and retraction length of the cylinder (401) so that the scraper (201) contacts the coating anilox roller (101).

2. The closed-type constant spacing adjustment device for scrapers as described in claim 1, characterized in that, The support assembly (3) further includes: a first support plate (302) disposed at both ends of the base plate (301) and a second support plate (303) disposed at both ends of the base plate (301); wherein The two cylinders (401) are fixed on the corresponding second support plates (303); The drive assembly (4) further includes: two guide rails (402) disposed on the first support plate (302), sliders (403) slidably connected to the guide rails (402), and a topless box (404) connected to the two sliders (403); wherein The telescopic end of the cylinder (401) is connected to the topless box (404); and The two topless boxes (404) are connected to the scraper assembly (2); The cylinder (401) is adapted to move the topless box (404) during extension and retraction. The topless box (404) drives the slider (403) to slide on the guide rail (402). The topless box (404) drives the scraper assembly (2) to move so that the scraper (201) contacts the coating anilox roller (101).

3. The closed-loop constant spacing adjustment device for scrapers as described in claim 2, characterized in that, The support assembly (3) further includes: a limiting block (304) disposed inside the first support plate (302); wherein The limiting block (304) is located inside the set-top box (404); The drive assembly (4) further includes: a support base (405) disposed on the outside of the topless box (404), a reducer (406) disposed on the outside of the support base (405), a servo motor (407) connected to the reducer (406), a threaded sleeve (408) embedded in the side of the topless box (404), a lead screw (409) threadedly connected to the threaded sleeve (408), and a coupling (410) disposed in the support base (405); wherein The two ends of the coupling (410) are connected to the reducer (406) and the lead screw (409); The other end of the lead screw (409) abuts against the limiting block (304); The main control module is electrically connected to the servo motor (407); and The servo motor (407) is adapted to drive the lead screw (409) to rotate via the reducer (406) and coupling (410). The lead screw (409) meshes with the threaded sleeve (408) so that the lead screw (409) moves back and forth and abuts against the lead screw (409).

4. The closed-loop constant spacing adjustment device for scrapers as described in claim 3, characterized in that, The coating roller assembly (1) further includes: bearing seats (102) sleeved at both ends of the coating anilox roller (101); wherein The bearing housing (102) is connected to the bearing of the coating anilox roller (101); and The bearing housing (102) is adapted to be fixed on the machine base to install the coating anilox roller (101) into the working position.

5. The closed-loop constant spacing adjustment device for scrapers as described in claim 4, characterized in that, The doctor blade assembly (2) further includes: a blade holder (202) disposed on one side of the coating anilox roller (101) and pressure plates (203) disposed on the upper and lower sides of the blade holder (202); wherein The two scrapers (201) are respectively fixed on the corresponding pressure plates (203); and When the scraper (201) and the scraper holder (202) come into contact with the coating anilox roller (101), a scraper cavity is formed.

6. The closed-type constant spacing adjustment device for scrapers as described in claim 5, characterized in that, The scraper assembly (2) further includes: fixing seats (205) disposed at both ends of the blade holder (202); The drive assembly (4) further includes: a connector (411) connected to the set-top box (404); wherein The other side of the connector (411) is connected to the fixing seat (205).

7. The closed-loop constant spacing adjustment device for scrapers as described in claim 6, characterized in that, The scraper assembly (2) further includes a reinforcing member (206) disposed on the blade holder (202).

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