Self-correcting scraperTechnical Field
the utility model belongs to the technical field of papermaking equipment, especially, relate to a self-repair formal scraper.
Background
Referring to fig. 1, a conventional doctor blade typically has a coating 2 of an abrasion resistant material attached to the side of a substrate 1 and through the coating 2, the toilet paper 4 on the dryer cylinder 3 is peeled and creped. Since the coating 2 is applied against the cylinder 3 during operation, arc-shaped grooves are worn out of the coating 2 after a certain period of use (see fig. 2). Because the side of the coating 2 used for scraping paper is seriously worn, along with the aggravation of the wear degree, after the groove reaches a certain depth, the phenomenon of difficult paper scraping caused by the overlarge contact area between the coating 2 and the drying cylinder 3 can be caused, and even the scrapping of a scraper can be caused.
This problem shortens the life of the scraper.
To solve the problem, some people improve the scraper: for example, patent No. CN100387775C discloses a doctor blade, in which a working layer is sprayed on the surface of an alloy coating to form a three-layer system, so as to improve the wear resistance of the doctor blade; further, the use of ceramic materials for the coating improves the service life of the doctor blade, as disclosed in CN 205077322U.
However, the above solutions only improve the wear resistance of the coating, and the position of the coating is still arranged on the side surface of the substrate 1, and the problem is not fundamentally solved. Therefore, the effect of improving the service life is limited, and the corresponding components are required to be added for improving the wear resistance of the coating, so that the manufacturing cost of the scraper is increased.
In view of the above, the prior art is obviously inconvenient and disadvantageous in practical use, and needs to be improved.
SUMMERY OF THE UTILITY MODEL
In view of the above-mentioned drawbacks, an object of the present invention is to provide a self-repairing scraper, which is formed by attaching a coating layer for scraping toilet paper to an end surface of a base; meanwhile, the side surface of the substrate is used for attaching a drying cylinder; in the use, along with the aggravation of coating wearing and tearing degree, the base member material of dryer wearing and tearing side department has played the correction effect to the sword to guarantee the sharpness of scraper, prolonged the life of scraper greatly.
In order to achieve the above object, the present invention provides a self-repairing type scraper, which comprises a base body, wherein a side surface and an end surface for forming a blade are arranged on the base body;
The side surface is used for attaching to a drying cylinder; and a coating for scraping toilet paper is attached to the end face.
According to the utility model discloses a from formal scraper of repairing, the thickness of coating is not more than 0.16 mm.
According to the utility model discloses a from formal scraper of repairing, the side is 0 with the contained angle delta of vertical face.
According to the utility model discloses a from formal scraper of repairing, the side is 0 ~ 5 with the contained angle delta of vertical face.
According to the utility model discloses a from formal scraper of repairing, the terminal surface is 75 ~ 90 with the contained angle theta of vertical face.
according to the utility model discloses a from formal scraper of repairing, the thickness of coating is 0.07 ~ 0.15 mm.
According to the self-repairing formal scraper of the utility model, the basal body at the side is provided with a groove; the groove includes a groove top surface and a groove bottom surface.
According to the utility model discloses a from formal scraper of repairment, the groove top surface is parallel arrangement with the terminal surface.
According to the utility model discloses a from repairing formal scraper, adopt the arc surface to connect the transition between tank face and the tank bottom surface.
According to the utility model discloses a from formal scraper of repairing, the maximum distance of groove top surface and terminal surface is not more than 0.13mm, and the thickness of coating is 0.03 ~ 0.05 mm.
The utility model aims to provide a self-repairing scraper, which is characterized in that a coating for scraping toilet paper is attached to the end surface of a base body; meanwhile, the side surface of the substrate is used for attaching a drying cylinder; in the use, along with the aggravation of coating wearing and tearing degree, the base member material of dryer wearing and tearing side department has played the correction effect to the sword to guarantee the sharpness of scraper, prolonged the life of scraper greatly.
Drawings
FIG. 1 is a schematic diagram of the state of the art;
FIG. 2 is a schematic view of a state of wear of the prior art;
fig. 3 is a schematic structural diagram of an embodiment of the present invention;
FIG. 4 is a schematic view of the working principle of the present invention;
Fig. 5 is a schematic structural diagram of an embodiment of the present invention;
Fig. 6 is a schematic structural diagram of an embodiment of the present invention;
in the figure: 1-substrate, 11-end face, 12-side face, 13-groove top face and 14-groove bottom face; 2-coating, 3-drying cylinder and 4-toilet paper.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more clearly understood, the present invention is further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention.
Referring to fig. 3, the present invention provides a self-repairing scraper, which comprises a base 1, wherein a side surface 12 and an end surface 11 for forming a cutting edge are arranged on the base 1.
The side surface 12 is used for attaching the drying cylinder 3; the end face 11 is attached with a coating 2 for scraping toilet paper 4.
the coating 2 is made of wear-resistant material, and the utility model preferably selects tungsten carbide-cobalt.
The working principle of the utility model is shown in figure 4:
Fig. 4-a, the coating 2 is in contact with the drying cylinder 3 when the doctor blade is new; the coating 2 scrapes the toilet paper 4 and simultaneously contacts and rubs the drying cylinder 3, thereby generating abrasion;
Fig. 4-b, which shows that after a period of use, the coating 2 is partly worn away as the wear increases, the contact area between the coating 2 and the drying cylinder 3 becomes larger and the doctor blade tends to become dull;
In fig. 4-c, the cylinder 3 is now in direct contact with the side 12, causing wear of the material of the substrate 1 at the side 12.
As can be seen from the above description, the utility model discloses in the use, because the material of base member 1 is softer easily to be worn off, consequently reduced 2 coating scrapes the wearing and tearing of paper one side. In other words, during the use process, the abrasion of the drying cylinder 3 on the base body 1 at the side surface 12 plays a role in correcting the blade edge, so that the sharpness of the scraper is ensured, and the service life of the scraper is greatly prolonged.
in the prior art, because the side 12 is provided with the coating 2, the coating 2 scratches the drying cylinder 3 in the abrasion process, and the bonding area of the side and the drying cylinder needs to be increased, so the included angle delta between the side 12 and the vertical surface is usually set to be 3-5 degrees.
With reference to fig. 3, because the utility model discloses a side 12 does not have coating 2, consequently, the contained angle delta of side 12 and vertical face can be 0, has reduced the process at the grinding delta angle of scraper in the manufacturing process, reduces the cost of manufacture of scraper. Or based on the consideration of protecting the drying cylinder 3, the delta angle is set to be 3-5 degrees in the prior art; the delta angle can be set to be 0-2 degrees or 0-5 degrees according to actual conditions.
In order to make the paper line thickness of 4 puckering of toilet paper reasonable, the utility model discloses a terminal surface 11 is 75 ~ 90 with the contained angle theta of vertical face, the utility model discloses preferred 80 ~ 85.
If the thickness of the coating 2 is too great, this will cause the drying cylinder 3 to rub mainly against the coating 2 during use, weakening the self-correcting action. Therefore, through a plurality of tests of the utility model people, the thickness of the coating 2 is not more than 0.16 mm. In the embodiment shown in FIG. 3, the thickness of the coating 2 is 0.07 to 0.15mm, preferably 0.08 or 0.09 mm.
During the wear of the material of the substrate 1 at the side 12, the width of the contact surface of the drying cylinder 3 with the coating 2 is substantially constant, but the width of the contact surface with the substrate 1 gradually increases. However, when the total width reaches a certain level (e.g., more than 0.2mm or more than 0.3mm), the paper scraping difficulty occurs, and the life of the blade reaches a limit.
Therefore, in order to further prolong the service life of the scraper, the utility model discloses still set up an embodiment. Referring to fig. 5, a groove is formed on the substrate 1 at the side surface 12; the recess comprises a slot top surface 13 and a slot bottom surface 14.
in this embodiment, the total width of the contact surface of the drying cylinder 3 with the substrate 1 and the coating 2 remains constant during wear, thus further extending the service life of the doctor blade. Therefore can know for guaranteeing the sharpness of scraper, the total width of contact surface can not be too big during wearing and tearing, consequently the utility model discloses a groove top surface 13 is not more than 0.13mm with terminal surface 11's maximum distance, and the thickness of coating 2 is 0.03 ~ 0.05mm, and the gross thickness is no longer than 0.18 mm.
Meanwhile, the scraper needs to have certain strength in the working process, so that the distance between the groove top surface 13 and the end surface 11 is preferably 0.09-0.13 mm. Preferably, the groove top surface 13 is arranged parallel to the end surface 11 to ensure that the total width remains stable during wear.
The utility model discloses still set up an embodiment, refer to fig. 6, for avoiding in the use groove root department to produce great stress concentration, groove top face 13 adopts arc surface transitional coupling with tank bottom surface 14. Preferably, the groove bottom surface 14 is a circular arc surface.
In order to improve the service life of the scraper, the deeper the groove, the better, but the depth of the groove is not more than half the thickness of the substrate 1 due to strength considerations.
The utility model discloses a thickness of base member 1 is 1.1 ~ 1.3 mm. The thickness can be increased or decreased based on the thickness range by those skilled in the art according to the specifications of the scraper and the actual use environment.
In summary, the utility model provides a self-repairing type scraper, which is characterized in that a coating for scraping toilet paper is attached to the end surface of a base body; meanwhile, the side surface of the substrate is used for attaching a drying cylinder; in the use, along with the aggravation of coating wearing and tearing degree, the base member material of dryer wearing and tearing side department has played the correction effect to the sword to guarantee the sharpness of scraper, prolonged the life of scraper greatly.
naturally, the present invention can be embodied in many other forms without departing from the spirit or essential attributes thereof, and it should be understood that various changes and modifications can be made by one skilled in the art without departing from the spirit or essential attributes thereof, and it is intended that all such changes and modifications be considered as within the scope of the appended claims.