Reciprocating type bidirectional scraper and hot galvanizing roller shaft cleaning device comprising same
By designing a lifting, lateral movement, and adjustment mechanism for a reciprocating bidirectional scraper, stepless dynamic adjustment of three cleaning modes and the scraper angle is achieved, solving the adaptability and cleaning effect problems of existing roller cleaning devices and improving cleaning efficiency and safety.
Patent Information
- Application Number
- CN202511856083.9
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- Filing Date
- 2025-12-10
- Publication Date
- 2026-03-06
AI Technical Summary
Existing roller cleaning devices have rigid structures, making it difficult to adapt to the cleaning needs of residues with different viscosity and adhesion strength. Furthermore, the traditional fixed-angle design is prone to interference or poor contact when facing rollers of different diameters, making it impossible to easily switch between unidirectional fine cleaning and bidirectional efficient cleaning.
Design a reciprocating bidirectional scraper that achieves three cleaning modes through lifting, lateral movement and adjustment mechanisms: unidirectional fine cleaning, bidirectional high-efficiency cleaning and simultaneous cleaning by both scrapers. The scraper angle is dynamically adjusted steplessly through a planar linkage adjustment mechanism consisting of a hinged frame and a telescopic cylinder.
It significantly improves the equipment's adaptability to different working conditions and cleaning efficiency, avoids frequent tool changes, and enables high-precision and refined operations for different cleaning tasks, thereby improving cleaning quality and equipment safety.
Smart Images
Figure CN121607358A_ABST
Abstract
Description
Technical Field
[0001] This invention relates to the field of industrial machinery cleaning equipment technology, specifically to a reciprocating bidirectional scraper and a hot-dip galvanized roller shaft cleaning device containing the scraper. Background Technology
[0002] In modern continuous production lines, various functional rollers are key components that ensure material transfer, pressure application, and uniform coating. However, due to process requirements, these rollers inevitably come into contact with and retain various sticky substances. For example, in the paper industry, pulp adheres to the surface of the drying cylinder; in the printing industry, ink rollers retain residual ink; and in plastic film production, cooling rollers adhere to polymer materials. If these residues are not cleaned in time, they will not only directly affect the surface quality of the product, causing serious quality problems such as paper breaks, printing defects, and film perforations, but also accelerate the wear of the rollers themselves, shorten the service life of the equipment, and even lead to unplanned shutdowns of the production line, resulting in huge economic losses. Currently, cleaning these types of rollers mainly relies on manual scraping, chemical cleaning, or the use of fixed scraper devices. Manual cleaning suffers from low efficiency, poor safety, and inconsistent cleaning results. Chemical cleaning may pose risks of environmental pollution and equipment corrosion. Existing fixed scraper devices are often structurally rigid, with a single cleaning angle, making it difficult to adapt to the cleaning needs of residues with different viscosities and adhesion strengths. In particular, for V-shaped scrapers, the traditional fixed angle design is prone to interference or poor contact when facing rollers of different diameters, failing to guarantee optimal cleaning results. At the same time, existing equipment generally lacks the flexibility of working modes, and cannot easily switch between unidirectional fine cleaning and bidirectional high-efficiency cleaning according to the specific conditions of the residues. Therefore, to address the shortcomings of existing requirements, we propose a reciprocating bidirectional scraper and a hot-dip galvanized roller shaft cleaning device containing the scraper. Summary of the Invention
[0003] To address these issues, the present invention provides a reciprocating bidirectional scraper and a hot-dip galvanized roller shaft cleaning device containing the scraper, thereby solving the aforementioned problems in the prior art.
[0004] To achieve the above objectives, the present invention provides the following technical solution: According to a first aspect of the present invention, a reciprocating bidirectional scraper includes a roller bracket for supporting and driving a roller, and a mounting frame disposed on one side of the roller bracket. The mounting frame is provided with a lifting mechanism, and the lifting mechanism is connected to a U-shaped frame. The U-shaped frame is connected to a bidirectional scraper via a rotating shaft mounted on its inner side. The bidirectional scraper is composed of a scraper first and a scraper second. Both sides of the scraper first and the scraper second are fixedly connected with side rods, and the side rods are slidably engaged with an arcuate groove formed in the inner wall of the U-shaped frame. The end of the rotating shaft is connected to an adjustment mechanism. The adjustment mechanism includes a connecting shaft fixed to the end of the rotating shaft, a connecting bracket fixed to both sides of the U-shaped frame, and a telescopic cylinder installed on the connecting bracket. The connecting shaft is provided with a protruding rod, which slides in cooperation with the arc groove of the arc frame on the connecting bracket. The output end of the telescopic cylinder is connected to a moving frame, which slides in cooperation with the protruding rod through the vertical groove on its inner wall, thereby converting the linear motion of the telescopic cylinder into the rotational motion of the rotating shaft, so that the scraper one or scraper two selectively contacts the surface of the roller. The bottom of the mounting frame is also provided with a lateral moving mechanism, which is used to drive the mounting frame and the bidirectional scraper to move toward or away from the roller, so that scraper one and scraper two can contact the roller surface simultaneously.
[0005] Furthermore, the lifting mechanism includes a drive motor, a threaded screw driven by the drive motor, and a threaded sleeve that is threadedly engaged with the threaded screw. The threaded sleeve is fixedly connected to the U-shaped frame, and the U-shaped frame forms a sliding pair with the vertical guide rail fixed to the mounting frame through a vertical sliding sleeve.
[0006] Furthermore, the lateral movement mechanism includes a second drive motor, a second threaded screw driven by the second drive motor, and a second threaded sleeve that is threadedly engaged with the second threaded screw. The second threaded sleeve is fixedly connected to the mounting frame, and the mounting frame forms a sliding pair with the lateral guide rail fixed to the lateral support through the lateral guide sleeve.
[0007] Furthermore, the top and bottom ends of the movable frame are provided with transverse sliding sleeves, which together with the transverse guide rod fixed to the connecting bracket form a sliding pair to constrain the movement trajectory of the movable frame.
[0008] Furthermore, the ends of the first and second scrapers away from their blades are fixedly connected to form a V-shaped structure with a fixed included angle.
[0009] Furthermore, the first scraper and the second scraper are rotatably connected by the rotating shaft, and the opening angle between the first scraper and the second scraper is adjustable.
[0010] Furthermore, it also includes a hinge frame, which is disposed between the rotating shaft and the two side rods. The hinge frame includes hinge rod one, hinge rod two, hinge rod three and hinge rod four that are hinged to each other. Hinged rod one and hinge rod two are rotatably connected to the rotating shaft, and hinge rod three and hinge rod four are rotatably connected to the two side rods respectively.
[0011] Furthermore, hinge rod three and hinge rod four are connected to a moving block via a hinge shaft. The moving block is connected to the output end of a telescopic cylinder two. The telescopic cylinder two is fixed to a fixed plate, the fixed plate is fixed to a connecting shaft two, and the connecting shaft two is fixed to a rotating shaft. The moving block and the connecting shaft two form a sliding pair. The telescopic cylinder two drives the moving block, causing the hinge frame to deform, thereby adjusting the opening angle of scraper one and scraper two.
[0012] Furthermore, an arc-shaped connecting rod connects the first connecting shaft and the second connecting shaft.
[0013] The present invention has the following advantages: 1. This reciprocating bidirectional scraper cleverly achieves three selectable cleaning modes through an adjustment mechanism: unidirectional fine cleaning and bidirectional high-efficiency cleaning. Operators can flexibly choose to use the upper scraper, lower scraper, or both scrapers simultaneously for cleaning, depending on the nature of the deposits on the roller surface and the needs of the cleaning stage. This versatility allows for finding the optimal cleaning strategy when facing different working conditions such as light dust or heavy dirt accumulation, significantly improving the equipment's adaptability to working conditions and overall cleaning efficiency, and avoiding the hassle of frequently changing tools or equipment to cope with different cleaning tasks. 2. This reciprocating bidirectional scraper utilizes a planar linkage adjustment mechanism consisting of a hinged frame and a telescopic cylinder to achieve stepless dynamic adjustment of the angle between scraper one and scraper two. For smaller diameter rollers, the opening angle can be increased to avoid mechanical interference; for stubborn deposits with special shapes, the angle can be finely adjusted to find the optimal cutting angle. This dynamic adaptability not only prevents equipment damage but also enables high-precision and refined operation of complex cleaning tasks, improving cleaning quality and equipment safety. Attached Figure Description
[0014] Figure 1 This is a front view of a reciprocating bidirectional scraper proposed in this invention; Figure 2 for Figure 1 Side view; Figure 3 Exploded view of the mounting bracket; Figure 4 Main view of the connecting bracket; Figure 5 This is an exploded view of the bidirectional scraper and the rotating shaft; Figure 6 This is a schematic diagram of the bidirectional scraper. Figure 7 for Figure 6 A side view diagram.
[0015] In the diagram: 1. Roller support; 2. Rotary motor; 3. Mounting frame; 4. Lifting mechanism; 401. Drive motor one; 402. Threaded screw one; 403. Threaded sleeve one; 404. Vertical sliding sleeve; 405. Vertical guide rail; 5. U-shaped frame; 501. Arc groove one; 6. Bidirectional scraper; 601. Scraper one; 602. Scraper two; 603. Rotating shaft; 604. Groove; 605. Through hole; 606. Side rod; 607. Protrusion; 7. Adjustment mechanism; 701. Connecting bracket; 702. Telescopic cylinder one; 703. Moving frame; 704. Arc frame; 7 05. Arc-shaped groove II; 706. Connecting shaft I; 707. Protruding rod I; 708. Transverse guide rod; 709. Transverse sliding sleeve; 8. Hinge frame; 801. Hinge rod I; 802. Hinge rod II; 803. Hinge rod III; 804. Hinge rod IV; 805. Hinge shaft; 901. Connecting shaft II; 902. Fixing plate; 903. Telescopic cylinder II; 904. Moving block; 905. Arc-shaped connecting rod; 10. Transverse moving mechanism; 101. Drive motor II; 102. Threaded screw II; 103. Threaded sleeve II; 104. Transverse guide rail; 105. Transverse guide sleeve; Detailed Implementation
[0016] The following specific embodiments illustrate the implementation of the present invention. Those skilled in the art can easily understand other advantages and effects of the present invention from the content disclosed in this specification. Obviously, the described embodiments are only some, not all, of the embodiments of the present invention. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.
[0017] Example 1; Reference Figure 1 - Figure 7 A reciprocating bidirectional scraper 6 includes a roller bracket 1 for supporting the roller to be cleaned. A rotary motor 2 is fixedly installed on one side of the roller bracket 1, and the output end of the rotary motor 2 is connected to the roller bracket 1 through a flange, thereby driving the roller to rotate. A mounting frame 3 is provided on one side of the roller bracket 1, and a lifting mechanism 4 is installed on the top of the mounting frame 3. The lifting mechanism 4 includes a drive motor 401, and a threaded screw 402 is fixedly connected to the output end of the drive motor 401. A threaded sleeve 403 is threadedly connected to the outer wall of the threaded screw 402. A U-shaped frame 5 is fixedly installed on the side wall of the threaded sleeve 403. Vertical sliding sleeves 404 are fixedly installed at both ends of the U-shaped frame 5 near the threaded sleeve 403. A vertical guide rail 405 is slidably connected to the inner wall of the vertical sliding sleeve 404, and the vertical guide rail 405 is fixedly connected to the mounting frame 3. The lifting mechanism 4 is used to adjust the initial height position of the bidirectional scraper 6 to accommodate rollers of different diameters. A bidirectional scraper 6 is installed on the inner side of the U-shaped frame 5. The bidirectional scraper 6 is composed of a first scraper 601 and a second scraper 602. The end of the first scraper 601 away from the blade head is fixedly connected to the end of the second scraper 602 away from the blade head. A rotating shaft 603 is installed at the connection between the two. Side rods 606 are fixedly installed on both sides of the scraper 601 and scraper 602. Arc grooves 501 are opened on both sides of the inner wall of the U-shaped frame 5. The outer wall of the side rod 606 is slidably connected to the inner wall of the arc groove 501. The two ends of the rotating shaft 603 are rotatably connected to the inner wall of the U-shaped frame 5. An adjustment mechanism 7 is connected to the end of the rotating shaft 603; The adjustment mechanism 7 includes: Connecting shaft 706 is fixedly connected to the end of rotating shaft 603; The connecting bracket 701 has two sets, which are respectively fixedly installed on both sides of the U-shaped frame 5. An arc-shaped frame 704 is fixedly installed on the side of the connecting bracket 701 near the U-shaped frame 5. An arc-shaped groove 705 is opened on the arc-shaped frame 704. A protruding rod 707 is fixedly installed on the outer side of the end of the connecting shaft 706. The outer wall of the protruding rod 707 is slidably connected to the inner wall of the arc-shaped groove. A telescopic cylinder 702 is fixedly installed on the side of the connecting bracket 701 near the mounting bracket 3. A moving frame 703 is fixedly connected to the output end of the telescopic cylinder 702. The vertical groove on the inner wall of the moving frame 703 is slidably connected to the outer wall of the protruding rod 707. This structure transforms the linear motion of the telescopic cylinder 702 into the forced sliding of the protruding rod 707 in the arc-shaped groove through the cooperation of the moving frame 703 and the protruding rod 707, and then into the rotational motion of the rotating shaft 603. The top and bottom ends of the movable frame 703 are fixedly connected to a transverse sliding sleeve 709. A transverse guide rod 708 is slidably connected to the inner wall of the transverse sliding sleeve 709. The end of the transverse guide rod 708 is fixedly connected to the connecting bracket 701. This structure ensures that the movable frame 703 moves linearly in the horizontal direction without deviation or twisting, thereby ensuring the accuracy of angle adjustment. The bottom of the mounting frame 3 is connected to a transverse moving mechanism 10. The transverse moving mechanism 10 includes: a transverse support, a second drive motor 101 fixedly mounted on the side wall of the transverse support, a second threaded screw 102 fixedly connected to the output end of the second drive motor 101, a second threaded sleeve 103 threadedly connected to the outer wall of the second threaded screw 102, the second threaded sleeve 103 fixedly connected to the mounting frame 3, and transverse guide sleeves 105 fixedly connected to both sides of the bottom of the mounting frame 3. A transverse guide rail 104 is slidably connected to the inner wall of the transverse guide sleeve 105, and the transverse guide rail 104 is fixedly mounted on the transverse support. This transverse moving mechanism 10 is used to control the forward and backward movement of the entire scraper assembly relative to the roller, and is the core for realizing the contact or separation of the scraper and the roller. Usage and working principle: First, the roller is installed on the roller bracket 1 and connected to the output end of the rotary motor 2 via a flange; then, the transverse movement mechanism 10 is controlled to move the mounting frame 3 so that the V-shaped opening of the bidirectional scraper 6 is aligned with the roller; next, the rotary motor 2 is started to drive the roller to rotate. This embodiment provides three working modes: Mode 1 (Upper Scraping Cleaning): The telescopic cylinder 702 extends, pushing the moving frame 703 to move; the moving frame 703 drives the protruding rod 707 through its vertical groove, forcing the protruding rod 707 to slide downward along the inner wall of the arc-shaped groove; the movement of the protruding rod 707 is transmitted through the connecting shaft 706, causing the rotating shaft 603 to rotate clockwise by a certain angle (the rotation angle is positively correlated with the extension distance of the telescopic cylinder 702); finally, the bidirectional scraper 6 rotates downward and tilts, so that the scraper 601 contacts the outer wall of the roller; at this time, under the continuous rotation of the roller, the scraper 601 can efficiently scrape off the adhering substances on its outer wall; Mode 2 (downward scraping cleaning): Telescopic cylinder 702 retracts, pulling the moving frame 703 to move; the moving frame 703 drives the protruding rod 707 to slide upward along the inner wall of the arc groove, and then drives the rotating shaft 603 to rotate counterclockwise through the connecting shaft 706; finally, the bidirectional scraper 6 rotates and tilts upward as a whole, so that the scraper 602 contacts the outer wall of the roller, realizing the cleaning of the roller; Mode 3 (Simultaneous Cleaning in Both Directions): In this mode, there is no need to start the adjustment mechanism 7; directly control the lateral movement mechanism 10 to move forward, driving the bidirectional scraper 6 to move towards the roller as a whole, until scraper 1 601 and scraper 2 602 simultaneously contact the outer wall of the roller, so that the roller can be cleaned in both directions simultaneously. This embodiment achieves flexible switching between single-blade selective cleaning and dual-blade synchronous cleaning through an adjustment mechanism 7, offering rich functionality; the cooperation between the arc groove and the protruding rod ensures the precision and stability of angle adjustment; the three working modes can achieve the best balance between cleaning efficiency and targeting for different cleaning needs; Example 2: The core difference is that the scraper 601, scraper 602 and rotating shaft 603 are not fixedly connected, but are connected by a dynamically adjustable hinge. The technical problem with the above-described embodiment 1 is that the included angle between scraper 601 and scraper 602 is fixed, which means that the V-shaped opening angle cannot be adjusted according to the actual diameter of the roller or the condition of the deposits; for rollers with smaller diameters, there may be a risk of interference; and for special deposit shapes, the fixed opening angle may not be the optimal cleaning posture. Furthermore: (refer to) Figure 5 - Figure 6 As shown, a reciprocating bidirectional scraper 6 has a groove 604 at the bottom of the first scraper 601, and a protrusion 607 is fixedly installed on the second scraper 602 near the connection with the first scraper 601. The protrusion 607 and the groove 604 are both provided with corresponding through holes 605. The inner wall of the through hole 605 is rotatably connected to the outer wall of the rotating shaft 603, thereby enabling the first scraper 601 and the second scraper 602 to swing independently around the rotating shaft 603 at a certain angle. A hinge frame 8 is provided between the outer wall of the rotating shaft 603 and the two side rods 606. The hinge frame 8 includes a first hinge rod 801, a second hinge rod 802, a third hinge rod 803, and a fourth hinge rod 804. The first hinge rod 801 and the second hinge rod 802 are rotatably connected to the rotating shaft 603. The other end of the first hinge rod 801 and the other end of the second hinge rod 802 are respectively rotatably connected to one of the two side rods 606. The outer walls of the two side rods 606 are respectively rotatably connected to the third hinge rod 803 and the fourth hinge rod 804. The end of the third hinge rod 803 away from the side rod 606 and the end of the fourth hinge rod 804 away from the side rod 606 are respectively rotatably connected. A hinge shaft 805 is rotatably connected. A moving block 904 is fixedly connected to the end of the hinge shaft 805 away from the U-shaped frame 5. A connecting shaft 901 is slidably connected to the inner side of the moving block 904. The end of the connecting shaft 901 is fixedly connected to the rotating shaft 603. A fixing plate 902 is also fixedly installed on the outer wall of the connecting shaft 901. A telescopic cylinder 903 is fixedly installed on the fixing plate 902. The output end of the telescopic cylinder 903 is fixedly connected to the moving block 904. An arc-shaped connecting rod 905 connects the end of the connecting shaft 706 away from the rotating shaft 603 and the end of the connecting shaft 901 away from the rotating shaft 603. In use, when it is necessary to adjust the opening angle between scraper 1 601 and scraper 2 602, the telescopic cylinder 2 903 is activated. The extension and retraction of the telescopic cylinder 2 903 directly drives the moving block 904 to slide along the outer wall of the connecting shaft 2 901. The movement of the moving block 904 is transmitted through the hinge shaft 805, forcing the hinge frame 8, composed of hinge rod 1 801, hinge rod 2 802, hinge rod 3 803, and hinge rod 4 804, to deform. Since each end of the hinge frame 8 is connected to the side rod 606 and the rotating shaft respectively... The hinge 603 allows the deformation of the hinge frame 8 to be converted into a pushing and pulling force on the two side rods 606, ultimately causing scraper blade 1 601 and scraper blade 2 602 to swing in opposite directions around the rotating shaft 603, thereby achieving stepless adjustment of the V-shaped opening angle. The arc-shaped connecting rod 905 between connecting shaft 1 706 and connecting shaft 2 901 ensures the synchronicity and consistency of the adjustment on both sides. Through the innovative design of the hinge frame 8, the scraper is given the ability to dynamically adjust the opening angle, greatly improving the adaptability and flexibility of the equipment. Operators can preset a safe opening angle according to the roller diameter to prevent interference, or dynamically adjust the opening angle according to the nature of the attached material to find the best cutting angle and cleaning force, thereby achieving more efficient and precise cleaning operations.
Claims
1. A reciprocating bidirectional doctor blade comprising a roller support for supporting and driving a roller, and a mounting bracket provided on one side of the roller support, characterized in that: The mounting frame is provided with a lifting mechanism, the lifting mechanism is connected with a U-shaped frame, the U-shaped frame is connected with a bidirectional scraper through a rotating shaft installed on the inner side of the U-shaped frame, the bidirectional scraper is composed of a scraper one and a scraper two, both sides of the scraper one and the scraper two are fixedly connected with side rods, the side rods are in sliding fit with arc-shaped grooves one opened in the inner wall of the U-shaped frame. The end of the rotating shaft is connected with an adjusting mechanism, the adjusting mechanism comprises a connecting shaft one fixed to the end of the rotating shaft, connecting brackets fixed to both sides of the U-shaped frame, and a telescopic cylinder one installed on the connecting brackets, a convex rod one is arranged on the connecting shaft, the convex rod one is in sliding fit with an arc-shaped groove two of an arc-shaped frame arranged on the connecting bracket, the output end of the telescopic cylinder one is connected with a moving frame, the moving frame is in sliding fit with the convex rod one through a vertical slot in the inner wall of the moving frame, so that the linear motion of the telescopic cylinder one is converted into the rotary motion of the rotating shaft, and then the scraper one or the scraper two selectively contacts the surface of the roller. The bottom of the mounting frame is also provided with a horizontal moving mechanism for driving the mounting frame and the bidirectional scraper to move towards or away from the roller as a whole, so that the scraper one and the scraper two can synchronously contact the surface of the roller.
2. A reciprocating bidirectional doctor blade according to claim 1, characterized in that The lifting mechanism comprises a driving motor one, a threaded screw rod one driven by the driving motor one, and a threaded sleeve one in threaded fit with the threaded screw rod one, the threaded sleeve one is fixedly connected with the U-shaped frame, the U-shaped frame is in sliding fit with a vertical guide rail fixed to the mounting frame through a vertical sliding sleeve.
3. A reciprocating bidirectional doctor blade according to claim 1, wherein The horizontal moving mechanism comprises a driving motor two, a threaded screw rod two driven by the driving motor two, and a threaded sleeve two in threaded fit with the threaded screw rod two, the threaded sleeve two is fixedly connected with the mounting frame, the mounting frame is in sliding fit with a horizontal guide rail fixed to a horizontal support through a horizontal guide sleeve.
4. A reciprocating bidirectional doctor blade according to claim 1, wherein The top end and the bottom end of the moving frame are both provided with horizontal sliding sleeves, the horizontal sliding sleeves are in sliding fit with horizontal guide rods fixed to the connecting brackets, so as to constrain the motion track of the moving frame.
5. A reciprocating bidirectional doctor blade according to claim 1, wherein The scraper one and the scraper two are fixedly connected at the end away from the blade head, forming a V-shaped structure with a fixed included angle.
6. A reciprocating bidirectional doctor blade according to claim 1, wherein The scraper one and the scraper two are rotationally connected through the rotating shaft, and the opening angle between the scraper one and the scraper two is adjustable.
7. A reciprocating bidirectional doctor blade according to claim 6, wherein A hinged frame is further included, the hinged frame is arranged between the rotating shaft and the two side rods, the hinged frame comprises hinged rods one, two, three and four which are hingedly connected with each other, wherein the hinged rod one and the hinged rod two are rotationally connected with the rotating shaft, the hinged rod three and the hinged rod four are respectively rotationally connected with the two side rods.
8. A reciprocating bidirectional doctor blade according to claim 7, characterized in that The hinged rod three and the hinged rod four are commonly connected with a moving block through a hinged shaft, the moving block is connected with the output end of a telescopic cylinder two.
9. A reciprocating bidirectional doctor blade according to claim 8, wherein, The telescopic cylinder two is fixed to a fixed plate, the fixed plate is fixed to a connecting shaft two, the connecting shaft two is fixed to the rotating shaft, the moving block and the connecting shaft two form a sliding pair.
10. A reciprocating bidirectional doctor blade according to claim 9, wherein The moving block is driven by the telescopic cylinder two, the hinged frame is deformed, so as to adjust the opening angle of the scraper one and the scraper two.
11. A reciprocating bidirectional doctor blade according to claim 10, wherein An arc-shaped connecting rod is connected between the connecting shaft one and the connecting shaft two.
12. A hot dip galvanizing roll shaft cleaning device having a reciprocating bidirectional doctor blade, characterized in that, A reciprocating bidirectional scraper comprising any one of claims 1-11.