CN210368454U

CN210368454U - Wrinkling scraper

Info

Publication number: CN210368454U
Application number: CN201921281500.1U
Authority: CN
Inventors: 杨锟
Original assignee: Suzhou Tpl Industrial Equipment Co Ltd
Current assignee: Suzhou Tpl Industrial Equipment Co Ltd
Priority date: 2019-08-09
Filing date: 2019-08-09
Publication date: 2020-04-21
Anticipated expiration: 2029-08-09

Abstract

The utility model provides a wrinkling scraper, which comprises a base body, the base body comprises a first surface, a second surface and an upper end surface, the upper end surface comprises a notch part and a protruding part, the opening of the notch part is communicated with the upper end surface and the first surface, a wear-resistant layer is arranged in the notch part, the notch part comprises a bottom surface and a side surface, the wear-resistant layer is provided with a tip end, a second top surface extending towards the side direction and a front end surface extending towards the bottom surface direction respectively along the tip end, the wear-resistant layer is arranged in the notch part and forms the tip end through the wear-resistant layer, so that the action direction of various acting forces received by the wrinkling scraper is parallel to or perpendicular to the interface between the wear-resistant layer and the base body, thereby the stress action between the wear-resistant layer and the base body is improved, particularly, the stress condition at the interface edge of the wear-resistant layer, thereby extending the life of the creping blade.

Description

Wrinkling scraper

Technical Field

The utility model relates to a scraper corrugates.

Background

Creping blades are commonly used in the paper industry to produce consumer paper, such as toilet tissue or paper towels. These tools have the following functions: the sheet is separated from the hot and rigid dryer cylinders while compression is applied to the sheet, thereby creating the crepe structure typical of tissue products.

In order to improve the performance of creping blades, such as good sliding wear on cast iron drying cylinders, very high fracture toughness, and at the same time relatively low hardness, thermally sprayed ceramic edge creping blades have been used in the tissue industry, but ceramic edges also suffer from problems, such as a great variation in the lifetime of the blade due to chipping of the ceramic edge, and conventional ceramic blades cannot maintain very strict tissue characteristics for any long time for high quality tissue such as facial tissue.

To this end, some improved ceramic edge scrapers have been developed, such as the ceramic edge scraper provided by CN1874886B, which is provided with a pre-bevel of an angle of at most 10 degrees on a steel substrate as shown in fig. 1, and a ceramic top layer is deposited on the pre-bevel to reduce the occurrence of ceramic edge chipping. However, due to the different characteristics of the ceramic material and the steel base material, especially the ceramic material is more brittle than the steel base material, and the scraper may generate high frequency vibration during the process of wrinkling the paper sheet, so that the problem of cracking is still easily generated at the edge of the interface between the steel base and the ceramic layer, which leads to the need of replacing the scraper, and therefore, the problem of cracking of the ceramic blade needs to be further solved, and the service life of the ceramic blade scraper is further prolonged.

SUMMERY OF THE UTILITY MODEL

Therefore, there is a need to provide a creping doctor blade that further reduces the chance of chipping of the ceramic edge and extends the life of the ceramic edge doctor blade.

The utility model provides a wrinkling scraper, includes the base member, the base member include first surface, with first surface to the second surface of back and connect the up end between first surface and second surface, the base member up end include a breach portion and relative protruding portion of breach portion, the opening of breach portion link up end and first surface, breach portion in be provided with the wearing layer, breach portion include bottom surface and side, the wearing layer form have most advanced, along the second top surface of most advanced difference to the side direction extension and to the preceding terminal surface of bottom surface direction extension.

Further, a precut inclined plane is further arranged on the base body, the precut inclined plane is arranged on the first surface, and if the included angle of the precut inclined plane is α, the included angle of the precut inclined plane is 0-20 degrees, so that the included angle of the precut inclined plane is α degrees.

Further, the end of the protruding part far from the bottom surface comprises a first top surface, the first top surface is obliquely arranged, the first top surface comprises a cut angle, and if the cut angle is β, the cut angle β is 0-20 degrees.

Furthermore, the front end face is coplanar with the pre-cut inclined plane, and the second top face is coplanar with the first top face.

Further, the bottom surface is perpendicular to the first surface, and the side surface is perpendicular to the upper end surface.

Further, the bottom surface is parallel to the second top surface, and the side surface is parallel to the front end surface.

Furthermore, the length of the front end face is 30-400 μm, and the length of the second top face is 3% -99% of the thickness of the substrate.

Furthermore, an arc surface is arranged between the bottom surface and the side surface or a groove is arranged between the bottom surface and the side surface.

Further, the thickness of the substrate is 1.2mm, the length of the front end face is 99 micrometers, the length of the second top face is 85 micrometers, the included angle of the precut inclined face is 15 degrees, the cutting angle of the first top face is 10 degrees, and the wear-resistant layer is a tungsten carbide alloy layer.

The utility model discloses still provide a manufacturing method of foretell wrinkling scraper simultaneously, include:

s1: providing a substrate, wherein the substrate comprises a first surface, a second surface and an upper end surface connected between the first surface and the second surface;

s2: a notch part and a protruding part opposite to the notch part are formed on the upper end face of the base body, the notch part comprises a bottom face and a side face, and the protruding part comprises a first top face.

S3: and forming a wear-resistant layer on the notch part by thermal spraying, physical vapor deposition or chemical vapor deposition of a wear-resistant material, wherein the wear-resistant layer comprises a front end surface and a second top surface.

S4: and grinding the front end face and the second top face of the wear-resistant layer to form a tip, grinding the first surface of the base body to form a prefabricated inclined plane when grinding the front end face, and grinding the first top face when grinding the second top face so that the first top face and the second top face are coplanar.

Has the advantages that: the utility model provides a wrinkling scraper, which comprises a base body, the base body comprises a first surface, a second surface and an upper end surface, the upper end surface comprises a notch part and a protruding part, the opening of the notch part is communicated with the upper end surface and the first surface, a wear-resistant layer is arranged in the notch part, the notch part comprises a bottom surface and a side surface, the wear-resistant layer is provided with a tip end, a second top surface extending towards the side direction and a front end surface extending towards the bottom surface direction respectively along the tip end, the wear-resistant layer is arranged in the notch part and forms the tip end through the wear-resistant layer, so that the action direction of various acting forces received by the wrinkling scraper is parallel to or perpendicular to the interface between the wear-resistant layer and the base body, thereby the stress action between the wear-resistant layer and the base body is improved, particularly, the stress condition at the interface edge of the wear-resistant layer, thereby extending the life of the creping blade.

Drawings

FIG. 1 schematically shows a prior art creping blade schematic

FIG. 2 is a schematic representation of the working state of a prior art creping blade

Figure 3 schematically shows a creping doctor according to a first embodiment of the invention

Figure 4 schematically shows a creping doctor according to a first embodiment of the invention in abutment with a drying cylinder

Figure 5 shows schematically a creping doctor according to a second embodiment of the invention

Figure 6 shows schematically a creping doctor according to a third embodiment of the invention

Figure 7 schematically shows a creping doctor according to a fourth embodiment of the invention

FIG. 8 schematically illustrates a creping doctor blade mounting method according to the invention

Description of the figures

Base body

1, 10

First surface 101

Second surface 102

Prefabricated ramp 103

Projection 11

First top surface 111

Notch portion 12

Bottom surface 121,321

Side 122,322

Wear

resistant layers

2, 13

Tip 130

Second top surface 131,331

Front end face 132,332

Drying cylinders

3, 14

Cambered surface 223

Groove 424

Detailed Description

The following detailed description of the invention will be further described in conjunction with the above-identified drawings.

Figure 1 shows a prior art creping blade comprising a base body 1, which at one end is provided with a preformed bevel surface on which a wear layer 2 is provided, and by means of which wear layer 2 a blade tip and a sliding surface along both sides of the tip and a sheet impact surface are formed, where normally in operation an external force acts on the blade base 1 such that the tip abuts against a drying cylinder 3 and a sheet impacts against the sheet impact surface at high speed such that the wear layer 2 receives a number of forces in different directions, including at least a sheet-to-sheet impact surface force F1 in the direction of the blade base, a cylinder-to-blade pressure F2, a friction force F3 between the drying cylinder and the blade tip, etc., and it has been found that the combined effect of these forces, the difference in material properties of the wear layer 2 and the base body 1 and high frequency vibrations of the blade in operation, such as in some cases, or in case of rust on the blade surface, chipping easily occurs along the edges of the interface between the wear layer 2 and the base body 1, as shown in the areas a and B, especially when the blade tip is pressed against the drying cylinder 3, leading to sheet holes or chipping or other quality problems, while if any initial defects already existing in the blade tip (such as cracks and micro-chips, even very small such cracks or chips) the defects or chipping at the edges will lead to defects in the overall structure of the wear-resistant material, leading to amplification or accelerated wear of the defects at the blade tip, the integrity of the blade tip (sliding surface, web impact surface and working apex) cannot be maintained for a long time, leading to the need for premature blade replacement.

Referring to fig. 3-4, fig. 3 schematically illustrates a creping blade according to a first embodiment of the present invention, the creping blade includes a base 10, the base 10 includes a notch 12 and a protrusion 11 protruding from the notch 12, a wear-resistant layer 13 is disposed in the notch 12, the notch 12 includes a bottom surface 121 and a side surface 122, and the wear-resistant layer 13 is formed with a tip 130, a second top surface 131 extending along the tip 130 to the side surface 122, and a front end surface 132 extending to the bottom surface 121.

The base 10 further includes a first surface 101, a second surface 102 facing away from the first surface 101, and an upper end surface connected between the first surface 101 and the second surface 102, the notch 12 is disposed on the upper end surface, and an opening of the notch 12 penetrates through the upper end surface and the first surface 101, so that the bottom surface 121 and the side surface 122 are L-shaped.

It will be appreciated that the substrate 10 may be made of steel.

Among them, the hardness of the base 10 is preferably more than 450 HV. For example, in one embodiment, the steel may be a carbon steel having a composition (in weight%) including 0.8-1.2% C, preferably about 1% C, 0.20-0.35% Si, 0.35-0.50% Mn, up to 0.02% P, up to 0.01% S, and the balance Fe and some other auxiliary elements in the periodic system less than 0.5%.

In another specific embodiment, the steel is stainless steel, the composition of which (in weight percent)% is

Comprises 0.03-0.08% of C, 16-18% of Cr, 10-14% of Ni, less than 2% of Mn, 2-3% of Mo

And the content of other auxiliary elements is less than 2 percent.

Preferably, the thickness of the substrate 10 is 0.6mm to 1.5mm, preferably 0.70mm to 1.25mm, and more preferably 1mm to 1.2mm, and it is understood that the thickness of the substrate 10 is the distance between the first surface 101 and the second surface 102.

The notch 12 is provided with a wear-resistant layer 13, the wear-resistant layer 13 includes a tip 130, a second top surface 131 extending along the tip 130 to the side surface 122, and a front end surface 132 extending along the bottom surface 121, it can be understood that the wear-resistant layer 13 further includes a bottom end surface and a side end surface of the wear-resistant layer 13, the bottom end surface of the wear-resistant layer 13 is fixedly attached to the bottom surface 121 of the notch 12, the side end surface of the wear-resistant layer 13 is fixedly attached to the side surface 122 of the notch 12, and the wear-resistant layer 13 is combined with the base 10 by fixing the bottom end surface to the bottom surface 121 and fixing the side end surface to the side surface 122.

Preferably, the wear resistant layer 13 is made of a wear resistant material, which is suitably a ceramic material, a cermet material or a carbide material. For example, the wear resistant material may be selected from the group consisting of metal oxides, ceramic materials, silicates, carbides, borides, nitrides and mixtures thereof. Furthermore, the wear-resistant material can be one or a combination of more of aluminum oxide, chromium oxide, zirconium oxide, tungsten carbide, chromium carbide, zirconium carbide, tantalum carbide and titanium carbide.

Preferably, the wear resistant material is applied by thermal spraying, physical vapour deposition or chemical vapour deposition.

In one embodiment, the wear resistant material is a tungsten carbide alloy, such as: tungsten carbide-cobalt-chromium alloys (86%, 10%, 4% by weight, respectively) or tungsten carbide-chromium carbide-nickel alloys (73%, 20%, 7% by weight, respectively).

In another embodiment, the wear-resistant material is a chromium oxide-titanium dioxide (Cr2O3/TiO2) ceramic with which the creping blade is relatively less prone to chipping, wherein the titanium dioxide content of the chromium oxide-titanium dioxide (Cr2O3/TiO2) ceramic is 30% or less, such as 8-28% titanium dioxide, 10-20% titanium dioxide.

When the wear-resistant material is chromium oxide-titanium dioxide (Cr2O3/TiO2) ceramic, the wear-resistant layer 13 is preferably formed by thermal spraying.

Furthermore, a bonding layer may be disposed between the wear-resistant layer 13 and the substrate 10 to further integrate the wear-resistant layer 13 and the substrate 10, so as to prevent the interface between the wear-resistant layer 13 and the substrate 10 from being broken.

In one embodiment, the bond coat is a Ni-Cr alloy coating, preferably in the form of a plasma spray, that forms a 10 μm to 50 μm bond coat on the substrate. In some other embodiments, the thickness of the bond coat may be 1-80% of the thickness of the coat, it being understood that the coat includes the wear layer 13 and the bond coat.

It will be appreciated that the tip 130 abuts the drying cylinder 14, the bottom surface 121 is substantially perpendicular to the first surface 101, and the side surface 122 is substantially perpendicular to the upper end surface, and it has been found that when the tip 130 abuts the drying cylinder 14 and causes the doctor blade to be in operation, and the sheet strikes the upper end surface at high speed, the force will be substantially parallel to the side surface 122 and substantially perpendicular to the bottom surface 121, the pressure of the drying cylinder 14 against the wear layer 13 is directed towards the connection of the bottom surface 121 and the side surface 122, and the direction of the friction between the drying cylinder 14 and the doctor blade tip 130 is directed towards the side surface 122, so that the force applied at the edge of the bottom end surface of the wear layer 13 and the bottom surface 121 and at the edge of the side end surface and the side surface 122 is improved, thereby reducing the chance of the occurrence of chipping at the interface edge of the wear layer 13 and the base body 10, the service life of the creping doctor is still considerably extended. In addition, it has been found that the life of the blade can be greatly prolonged after the occurrence of rust on the blade surface for the same reason.

Preferably, the base 10 is further provided with a pre-cut inclined surface, in this embodiment, the pre-cut inclined surface is provided on the first surface 101, if the included angle of the pre-cut inclined surface is α, α is preferably 0 to 20 °, more preferably 1 to 15 °, or 5 to 10 °, and the front end surface 132 is coplanar with the pre-cut inclined surface.

Further, the front face 132 is angled at a greater angle than the pre-cut bevel, and in one embodiment, the angle of the front face 132 is greater than α 1-8 °, and more preferably greater than α 3-5 °.

Further, the end of the protrusion 11 away from the bottom surface 121 includes a first top surface 111, the first top surface 111 is disposed obliquely, the first top surface 111 includes a cut angle, and if the cut angle is β, the cut angle β is preferably 0-20 °, more preferably 1-15 °, or 5-10 °, and the second top surface 131 is coplanar with the first top surface 111.

Further, the length of the front end surface 132 is 30-400 μm, the length of the front end surface 132 is the distance between the tip 130 and the bottom surface 121 along the front end surface 132, within this range, the tip can be kept in a sharp shape all the time, so that the paper sheet is fine, the length of the second top surface 131 is 3% -99% of the thickness of the substrate 10, more preferably 5% -80% of the thickness of the substrate 10, or 6% -60%, 10% -50% of the thickness of the substrate 10, and the length of the second top surface 131 is the distance between the tip 130 and the side surface 122 along the second top surface 131.

In a more preferred embodiment, the thickness of the substrate 10 is 1.2mm, and the length of the second top surface 131 is 30 μm to 300 μm, and more preferably 36 μm to 118 μm.

Referring to fig. 5, in the second embodiment of the present invention, in order to avoid stress concentration at the position between the bottom surface 121 and the side surface 122, an arc surface 223 is disposed between the bottom surface 121 and the side surface 122.

Referring to fig. 6, in the third embodiment of the present invention, the bottom surface 121 is substantially parallel to the second top surface 131, and the side surface 122 is substantially parallel to the front end surface 132, it is preferable that the bottom surface 121 is parallel to the second top surface 131, and the side surface 122 is parallel to the front end surface 132, so that the entire wear-resistant layer 13 is parallelogram-shaped, in this case, the wear-resistant layer 13 has a good stress function, and prevents the edge from breaking, and at the same time, the surface between the wear-resistant layer 13 and the coating contact of the drying cylinder 14 is kept consistent, which can further greatly prolong the service life of the scraper, and in addition, the sharp end can be kept more stable, and the produced paper sheet can be kept fine and.

Further, referring to fig. 7, in a fourth embodiment of the present invention, a groove 424 is further disposed between the bottom surface 121 and the side surface 122, a wear-resistant layer 13 is disposed in the groove 424, a contact area between the wear-resistant layer 13 and the substrate 10 is further increased by the groove 424, and a fixing effect of the wear-resistant layer 13 is increased.

Further, the bottom surface 121 is a rough surface, and the side surfaces 122 are also provided with rough surfaces, so as to further increase the contact area between the wear-resistant layer 13 and the substrate 10, increase the fixing effect of the wear-resistant layer 13, and prevent the occurrence of edge breakage.

Further, the surface roughness of the bottom surface 121 is equal to or greater than Ra1, and the surface roughness of the side surface 122 is equal to or greater than Ra 1.

Further, the bottom surface 121 may be configured as other irregular surfaces, and the side surface 122 may also be configured as an irregular surface.

Example 1

In the consumer paper machine, three different types of creping blades were tested. The first type, mark is A, is the utility model discloses a blade, its base member 10 thickness is 1.2mm, preceding terminal surface 132 length 99 mu m, second top surface 131 length 85 mu m, the contained angle on inclined plane is cut in advance is 5, the corner cut of first top surface 111 is 10, wearing layer 13 be the tungsten carbide alloy. The second type, labeled B, is a prior art ceramic tipped blade having an alumina-based material used as a ceramic coating. The third type, labeled C, is a prior art steel doctor blade.

The operating conditions of the creping process were as follows:

-70% LBKP, 30% NBKP; basis weight: 16gsm tissue paper; vehicle speed: 1550 m/min;

-a wrinkling rate of 12%;

16 feet diameter of steel dryer cylinder;

-paper towel moisture content 6-7%;

creping blade dimensions 1.2 × 110 × 3985mm (thickness × width × length);

blade bevel 80 degrees (10 degrees less than right angle);

the same cylinder sticking agent and cylinder stripping agent.

Each type of creping blade was run 3 times, wherein:

the utility model discloses a3 scraper (blade A) of wrinkling begin to appear cracked after moving 61-115 hours respectively, and blade B begins to appear cracked after moving 11-40 hours, need change the blade after blade C moves 2-4 hours, the utility model discloses a scraper of wrinkling compares traditional steel scraper life and improves 15-57 times, compares that prior art's ceramic scraper improves 1.5-10 times.

Furthermore, the manufacturing method of the wrinkling scraper of the utility model comprises the following steps.

S1: providing a substrate 10, wherein the substrate 10 comprises a first surface 101 and a second surface 102, the substrate 10 is made of steel and has a thickness of 0.6mm to 1.5mm, preferably 0.70mm to 1.25mm, and more preferably 1mm to 1.2 mm;

s2: a notch 12 and a protrusion 11 opposite to the notch 12 are formed at one end of the base 10. in one embodiment, the notch 12 may be formed at one end of the base 10 by grinding or molding the notch 12.

S3: the wear resistant layer 13 is formed in the gap 12 by thermal spraying, physical vapor deposition or chemical vapor deposition of a wear resistant material, said wear resistant layer 13 comprising a front face 132 and a second top face 131, said wear resistant material being suitably a ceramic material, a cermet material or a carbide material. For example, the wear resistant material may be selected from the group consisting of metal oxides, ceramic materials, silicates, carbides, borides, nitrides and mixtures thereof. Further, the wear-resistant material can be aluminum oxide, chromium oxide, zirconium oxide, tungsten carbide, chromium carbide, zirconium carbide, tantalum carbide, titanium carbide and mixtures thereof.

In a particular embodiment, the wear resistant layer 13 has a thickness of 400 μm or less.

S4: the front end face 132 and the second top face 131 of the wear layer 13 are ground to form the tip 130, it being understood that the front end face 132 is ground simultaneously with the first surface 101 of the substrate 10 to form the pre-bevel 103, and the second top face 131 is ground simultaneously with the first top face 111, such that the first top face 111 is coplanar with the second top face 131.

It will be appreciated that the front end face 132 is ground to a predetermined angle α and the second top face 131 is ground to a predetermined angle β.

Further, after step S2, a step of roughening the bottom surface 121 and/or the side surface 122 of the notch portion 12 is further included, and it is preferable that the bottom surface 121 and/or the side surface 122 have a surface roughness of Ra1 or more.

Further, step S4 is followed by grinding the front end face 132 such that the included angle of the front end face 132 is greater than the included angle of the pre-bevel 103.

Further, after the step S4, the method further includes a step of grinding the front end surface 132 and the second top surface 131, so that the surface roughness of the front end surface 132 and the second top surface 131 is smaller than or equal to Ra 32.

In addition, other changes may be made by those skilled in the art without departing from the spirit of the invention, and it is intended that all such changes be considered within the scope of the invention as hereinafter claimed.

Claims

1. The utility model provides a wrinkling scraper, includes the base member, its characterized in that, the base member include the first surface, with the first surface to the second surface of back and connect the up end between first surface and second surface, the base member up end include a breach portion and relative protruding portion of breach portion, the opening of breach portion link up end and first surface, breach portion in be provided with the wearing layer, breach portion include bottom surface and side, the wearing layer form have most advanced, along the second top surface of most advanced difference to the side direction extension and to the preceding terminal surface of bottom surface direction extension.

2. The creping doctor according to claim 1, characterized in that the base body is further provided with a pre-cut bevel, said pre-cut bevel being provided on the first surface, and if the pre-cut bevel is provided at an included angle of α, then α is 0-20 °.

3. The creping doctor according to claim 2, characterized in that the end of the projection remote from the bottom surface comprises a first top surface, said first top surface being obliquely arranged, said first top surface comprising a cut angle, if β is provided, β is 0-20 °.

4. Creping doctor according to claim 3, characterized in that said front end face is coplanar with the precut bevel and said second top face is coplanar with the first top face.

5. A creping doctor according to claim 3, characterised in that said bottom surface is perpendicular to the first surface and said side surfaces are perpendicular to the upper end surface.

6. A creping doctor according to claim 3, characterised in that said bottom surface is parallel to the second top surface and said side surfaces are parallel to the front end surface.

7. Creping doctor according to any of claims 4 to 6, characterised in that the length of the front end face is 30 to 400 μm and the length of the second top face is 3 to 99% of the thickness of the substrate.

8. Creping doctor according to any of claims 4 to 6, characterized in that an arc is provided between the bottom side and the side surfaces or a groove is provided between the bottom side and the side surfaces.

9. The creping doctor according to claim 7, characterised in that the thickness of the base body is 1.2mm, the length of the front end face is 99 μm, the length of the second top face is 85 μm, the included angle of the precut bevel is 15 °, the cut angle of the first top face is 10 °, and the wear resistant layer is a tungsten carbide alloy layer.