CN219503286U

CN219503286U - Slurry scraper

Info

Publication number: CN219503286U
Application number: CN202320452234.4U
Authority: CN
Inventors: 张国玉
Original assignee: Heli Photovoltaic Technology Shanghai Co ltd
Current assignee: Heli Photovoltaic Technology Shanghai Co ltd
Priority date: 2023-03-10
Filing date: 2023-03-10
Publication date: 2023-08-11
Anticipated expiration: 2033-03-10

Abstract

The utility model relates to a pulp scraper (100) comprising a support plate (1) coated with a flexible material to form a first scraper bar (2), a second scraper bar (3) and a third scraper bar (4), each scraper bar having a hardness less than the hardness of the support plate, the first scraper bar (2) extending outwardly from the support plate (1) in a first direction (F1), the second and third scraper bars extending outwardly from the support plate in a second direction (F2) perpendicular to the first direction (F1), the second scraper bar being adjacent to the first scraper bar, a free edge (41) of the third scraper bar extending beyond a free edge (31) of the second scraper bar in the second direction (F2), the first, second and third scraper bars having a cross section which tapers towards their respective free edges in the thickness direction. The slurry scraper has enough strength, and each scraper bar can rebound under stress, so that the slurry remained on the surface of an object can be collected cleanly without damaging the slurry.

Description

Slurry scraper

Technical Field

The present utility model relates to a slurry scraper for collecting slurry, and more particularly, to a slurry scraper for collecting residual slurry before and after preparing slurry for solar cells.

Background

In the photovoltaic solar power generation field, silver paste needs to be printed onto a silicon wafer to form a solar cell. When slurry placement is performed before and after the silver paste is prepared, the paste may remain on the paste tank walls. In addition, slurry remains on the slurry preparation machine roll.

On the one hand, slurry residues can cause loss of raw material components in the slurry, and inaccurate proportioning of the slurry components is caused. When the experimental data of the slurry are measured, the experimental data are inaccurate, and the experimental cost is increased due to repeated experiments. When used to prepare solar cells, this can result in failure to obtain a desired quality of the solar cell, possibly resulting in a reduction in the energy conversion efficiency of the solar cell. On the other hand, the cost of silver paste is relatively high, and paste residue causes paste loss, thereby resulting in an increase in production cost. Therefore, it is desirable to minimize the slurry residue.

It is common practice to use a scraper to scrape the residual slurry off the slurry tank walls or the preparer rollers. One known slurry scraper is formed from a rectangular plastic strip and a rectangular plastic plate adhesively attached by an AB glue or 520 glue. A slurry blade is also known, which is formed by cutting an injection molded plastic belt into strips. These slurry scrapers are thick, hard, single in shape, and cannot scrape the slurry remaining on the slurry tank walls or the preparer rollers. In addition, these slurry blades have poor heat resistance, poor abrasion resistance, easy burning, short life, rough surface, and may suffer from burrs and chips, and in particular, become brittle and hard at low temperatures, adversely affect slurry collection, and may damage the slurry tank walls or the machine rollers.

Accordingly, there is a need for improvements in pulp scrapers.

Disclosure of Invention

The present utility model aims to solve at least one aspect of the above-mentioned problems occurring in the prior art.

According to the present utility model there is provided a pulp scraper comprising a support plate coated with a flexible material to form a first, second and third scraper bar having a hardness less than that of the support plate, the first scraper bar extending outwardly from the support plate in a first direction, the second and third scraper bars extending outwardly from the support plate in a second direction perpendicular to the first direction, the second scraper bar being adjacent the first scraper bar, the free edge of the third scraper bar extending beyond the free edge of the second scraper bar in the second direction, the first, second and third scraper bars having progressively decreasing cross sections in the thickness direction towards their respective free edges.

According to a preferred embodiment of the utility model, the pulp scraper further comprises a fourth scraper bar extending outwardly from the support plate in a third direction opposite to the second direction, the fourth scraper bar having a hardness less than the hardness of the support plate.

According to a preferred embodiment of the utility model, the fourth wiper strip has a cross section in the thickness direction which tapers towards its free edge.

According to a preferred embodiment of the utility model, the cross sections of the first, second, third and fourth wiper strips are all trapezoidal.

According to a preferred embodiment of the utility model, the edge thickness of the first, second, third and fourth wiper strips at their respective free edges is in the range of 1mm to 3 mm.

According to a preferred embodiment of the utility model, the third wiper strip has a smaller dimension in the first direction than the second wiper strip; and the edge thickness of the third scraping strip is smaller than that of the second scraping strip.

According to a preferred embodiment of the utility model, the dimensions of the second and fourth wiper strips in the first direction are smaller than the dimensions of the first wiper strip in the second direction; and the edge thickness of the second scraping strip and the fourth scraping strip is smaller than that of the first scraping strip.

According to a preferred embodiment of the utility model, the projections of the first, second, third and fourth wiper strips in the plane of the support plate are trapezoidal, the free edges of each of them forming the upper base of the trapezoid.

According to a preferred embodiment of the utility model, the support plate is a cross-shaped plate or a rectangular plate.

According to a preferred embodiment of the utility model, the support plate is made of plastic, and the first, second, third and fourth wiper strips are made of silicone.

With the above-described various structures of the slurry blade, the present utility model has at least one of the following advantages: the wear-resistant plastic has the advantages of easy manufacture, convenient use, smooth surface, easy cleaning, wear resistance, long service life, environmental protection, no toxicity, no pollution, good chemical property stability, good thermal stability, normal use at-60 ℃ to 250 ℃ and good elasticity even at-60 ℃ to-75 ℃; the support plate provides sufficient strength that each wiper strip can spring back under force and has a unique shape and good adsorptivity to facilitate clean collection of residual slurry on the slurry tank wall or the preparation machine roll without damaging the slurry tank wall or the preparation machine roll.

Drawings

The utility model is described in detail below via exemplary embodiments with reference to the attached drawing figures, wherein:

FIG. 1 shows a schematic front view of a slurry screed according to an embodiment of the present utility model;

FIG. 2 shows a schematic enlarged A-A section of the slurry screed shown in FIG. 1;

FIG. 3 shows a schematic B-B cross-sectional enlargement of the slurry screed shown in FIG. 1;

fig. 4 shows a schematic C-C section partial enlargement of the pulp scraper shown in fig. 1.

Technical features represented by reference numerals in the drawings are as follows. 100: a slurry scraper; 1: a support plate; 11: a first side; 12: a second side; 13: a third side; 2: a first scraping strip; 21: a free edge of the first wiper strip; 3: a second scraping strip; 31: the free edge of the second wiper strip; 4: a third scraping strip; 41: the free edge of the third wiper strip; 5: a fourth scraping strip; 51: the free edge of the fourth scraping strip; f1: a first direction; f2: a second direction; f3: and a third direction.

The figures are merely schematic and are not necessarily drawn to scale. They show only those parts which are necessary for elucidation of the utility model, while other parts may be omitted or merely mentioned briefly. The utility model may include other components or portions in addition to those shown in the figures.

Detailed Description

In the following description, numerous specific details are set forth in order to provide a thorough understanding of the present utility model to those skilled in the art. It will be apparent, however, to one skilled in the art that the present utility model may be practiced without some of these specific details. Furthermore, it should be understood that the utility model is not limited to specific described embodiments. Rather, the utility model can be considered to be implemented with any combination of the following features and elements, whether or not they relate to different embodiments. Thus, the following features, embodiments, and advantages are merely illustrative and should not be considered elements or limitations of the claims except where explicitly set out in a claim.

The terms "first," "second," "third," "fourth," and the like, herein are used to describe components or portions, and are merely used to distinguish between components or portions and are not used to limit the order or number of such components or portions.

Fig. 1 to 4 schematically show a pulp scraper 100 according to an embodiment of the present utility model. As shown in fig. 1, the pulp scraper 100 includes a support plate 1. In the embodiment shown in fig. 1, the support plate 1 is a cross-shaped plate. It should be appreciated that any suitable shape is possible, such as rectangular, oval, cross-shaped, square, circular, etc.

The support plate 1 is made of, for example, plastic in order to provide sufficient strength to the pulp scraper 100. The plastic is, for example, polyethylene (PE) or polypropylene (PP). It should be appreciated that the support plate 1 may also be made of any suitable known hard material, such as metal, provided that sufficient strength is provided to the slurry blade 100.

The support plate 1 is coated with a flexible material to form a first wiper strip 2, a second wiper strip 3 and a third wiper strip 4. The hardness of the first wiper strip 2, the second wiper strip 3 and the third wiper strip 4 is smaller than that of the support plate 1.

In the embodiment shown in fig. 1, the support plate 1 comprises a first side 11 and a second side 12 perpendicular to each other, the length of the first side 11 being greater than the length of the second side 12. The first wiper strip 2 extends outwardly from the first side 11 of the support plate 1 in a first direction F1. The second wiper strip 3 and the third wiper strip 4 extend outwardly from the second side 12 of the support plate 1 in a second direction F2 perpendicular to the first direction F1. The second wiper strip 3 is adjacent to the first wiper strip 2. The free edge 41 of the third wiper strip 4 extends beyond the free edge 31 of the second wiper strip 3. That is, the third wiper strip 4 extends more outwardly than the second wiper strip 3. In a specific embodiment, the third wiper strip 4 extends much more than 2.5mm outwards than the second wiper strip 3.

The first wiper strip 2 can be used, for example, for wiping off residual pulp from the side wall of a pulp tank. The second scraper 3 can be used, for example, for scraping off residual pulp from the bottom wall of the pulp tank. The third wiper strip 4 may for example be used to wipe off slurry remaining in a recess formed between the bottom wall and the side wall of the slurry tank. The slurry screed 100 of the present utility model is particularly applicable to slurry tanks where there is a recess between the bottom wall and the side wall of the slurry tank.

In addition, the pulp scraper 100 may further include a fourth scraper bar 5, the fourth scraper bar 5 extending outwardly from a third side 13 opposite the second side 12 in a third direction F3 opposite the second direction F2. The fourth wiper strip 5 is also less hard than the supporting plate 1. The fourth scraping strip 5 may be used, for example, for scraping residual slurry from the top of the slurry tank (e.g., the inner surface of the tank opening) or from the bottom wall of the slurry tank (in this case, the slurry scraper 100 is used upside down).

The first wiper strip 2 has a cross section that tapers in the thickness direction towards its free edge 21, the second wiper strip 3 has a cross section that tapers in the thickness direction towards its free edge 31, the third wiper strip 4 has a cross section that tapers in the thickness direction towards its free edge 41, and the fourth wiper strip 5 has a cross section that tapers in the thickness direction towards its free edge 51, as shown in fig. 2 to 4. That is, the thicknesses of the first, second, third, and fourth wiper strips 2, 3, 4, and 5 are gradually reduced. As shown in fig. 2 to 4, the cross sections of the first wiper strip 2, the second wiper strip 3, the third wiper strip 4, and the fourth wiper strip 5 in the thickness direction are each trapezoidal. Preferably, the trapezoid is an isosceles trapezoid.

The slurry screed of the present utility model may have a thinner blade edge thickness (i.e., the thickness of the blade portion used to scrape the slurry) and a softer blade, relative to prior art slurry screeds having the same thickness in each portion, which allows the slurry to be collected cleaner and without damaging the collected surface.

Preferably, the flexible materials forming the wiper strips are the same. The flexible material may be, for example, silicone. It should be appreciated that the flexible material forming the wiper strips may be any suitable known flexible material, such as thermoplastic elastomer (TPE), as long as it is suitable for wiping a slurry.

In a preferred embodiment, the edge thickness of the first wiper strip 2, the second wiper strip 3, the third wiper strip 4, the fourth wiper strip 5 at their respective free edges is in the range of 1mm to 3 mm. In a specific embodiment, the edge thickness of the first wiper strip 2 is 2.5mm, the edge thicknesses of the second wiper strip 3 and the fourth wiper strip 5 are 2mm, and the edge thickness of the third wiper strip 4 is 1.7mm. Advantageously, the edge thickness of the wiper strip corresponds to the length of the wiper strip, for example, the length of the wiper strip is large, and correspondingly the edge thickness of the wiper strip is large, and vice versa, whereby when the same pressure is applied to these wiper strips, their amount of compressive deformation is substantially the same, and the slurry collection effect obtained is also substantially the same.

As shown in fig. 1, in the first direction F1, the third wiper strip 4 has a smaller size than the second wiper strip 3; accordingly, the edge thickness of the third wiper strip 4 is smaller than the edge thickness of the second wiper strip 3. In a preferred embodiment, the dimensions of the second wiper strip 3 and the fourth wiper strip 5 in the first direction F1 are smaller than the dimensions of the first wiper strip 2 in the second direction F2; accordingly, the edge thickness of the second wiper strip 3 and the fourth wiper strip 5 is smaller than the edge thickness of the first wiper strip 2.

As shown in fig. 1, the projections of the first wiper strip 2, the second wiper strip 3, the third wiper strip 4 and the fourth wiper strip 5 in the plane of the support plate 1 are trapezoidal, and their respective free edges form the upper base, i.e. the shorter base, of the trapezoid. This trapezoidal shape of the wiper strip is particularly advantageous in case there is an inclined portion between the side wall and the bottom wall of the slurry tank or between the side wall and the top wall of the slurry tank. For example, the inclination of the trapezoid-shaped sloping sides of the wiper strip coincides with the inclination of the sloping portions of the slurry tank, so that the trapezoid-shaped sloping sides of the wiper strip can be used for scraping the slurry remaining on these sloping portions of the slurry tank.

In a preferred embodiment, the support plate 1 is made of plastic and the first 2, second 3, third 4, fourth 5 wiper strips are made of silicone. In this embodiment, the support plate 1 is formed integrally with the wiper strips by extrusion molding, thereby forming the slurry wiper 100, and the support plate 1 of the slurry wiper 100 is entirely covered with the silica gel. It should be understood that the silicone may also cover only a part of the support plate 1, for example only the area of the support plate 1 where the individual wiper strips are located, in order to form soft wiper strips extending outwards from the support plate 1.

The slurry scraper 100 is easy to manufacture, convenient to use, smooth in surface, easy to clean, resistant to abrasion, long in service life, environment-friendly, nontoxic, pollution-free, good in chemical property stability, good in thermal stability, capable of being normally used at-60 ℃ to 250 ℃ and good in elasticity even at-60 ℃ to-75 ℃; the support plate provides sufficient strength that each wiper strip can spring back under force and has a unique shape and good adsorptivity to facilitate clean collection of residual slurry on the slurry tank wall or the preparation machine roll without damaging the slurry tank wall or the preparation machine roll.

While the utility model has been described in terms of preferred embodiments, the utility model is not so limited. Any person skilled in the art should not depart from the spirit and scope of the present utility model and should therefore fall within the scope of the utility model as defined by the appended claims.

Claims

1. A pulp scraper (100), the pulp scraper (100) comprising a support plate (1), characterized in that the support plate (1) is coated with a flexible material to form a first scraper bar (2), a second scraper bar (3) and a third scraper bar (4), the hardness of the first scraper bar (2), the second scraper bar (3) and the third scraper bar (4) being smaller than the hardness of the support plate (1), the first scraper bar (2) extending outwardly from the support plate (1) in a first direction (F1), the second scraper bar (3) and the third scraper bar (4) extending outwardly from the support plate (1) in a second direction (F2) perpendicular to the first direction (F1), the second scraper bar (3) being adjacent to the first scraper bar (2), in the second direction (F2) the free edge of the third scraper bar (4) extending beyond the free edge of the second scraper bar (3), the first scraper bar (3) and the third scraper bar (4) having a decreasing thickness in their respective cross-section in the first direction (F2).

2. The pulp scraper (100) according to claim 1, characterized in that the pulp scraper (100) further comprises a fourth scraper bar (5), the fourth scraper bar (5) extending outwardly from the support plate (1) in a third direction (F3) opposite to the second direction (F2), the fourth scraper bar (5) having a hardness that is less than the hardness of the support plate (1).

3. The pulp scraper (100) according to claim 2, characterized in that the fourth scraper bar (5) has a cross section in the thickness direction that gradually decreases towards its free edge.

4. A pulp scraper (100) according to claim 3, characterized in that the cross-sections of the first scraper bar (2), the second scraper bar (3), the third scraper bar (4) and the fourth scraper bar (5) are all trapezoidal.

5. A pulp scraper (100) according to claim 3, characterized in that the edge thickness of the first (2), second (3), third (4) and fourth (5) scraping strips at their respective free edges is in the range of 1mm to 3 mm.

6. The pulp scraper (100) according to claim 5, characterized in that in the first direction (F1) the third scraper bar (4) has a smaller size than the second scraper bar (3); and the edge thickness of the third scraping strip (4) is smaller than the edge thickness of the second scraping strip (3).

7. The pulp scraper (100) according to claim 6, characterized in that the dimensions of the second scraper bar (3) and the fourth scraper bar (5) in the first direction (F1) are smaller than the dimensions of the first scraper bar (2) in the second direction (F2); and the edge thickness of the second scraping strip (3) and the fourth scraping strip (5) is smaller than that of the first scraping strip (2).

8. The pulp scraper (100) according to any one of claims 3 to 7, characterized in that the projections of the first scraper bar (2), the second scraper bar (3), the third scraper bar (4) and the fourth scraper bar (5) in the plane of the support plate (1) are each trapezoidal, their respective free edges forming the upper base of the trapezoid.

9. The pulp scraper (100) according to any of claims 3-7, characterized in that the support plate (1) is a cross-shaped plate or a rectangular plate.

10. The pulp scraper (100) according to any one of claims 3 to 7, characterized in that the support plate (1) is made of plastic, and the first scraper bar (2), the second scraper bar (3), the third scraper bar (4) and the fourth scraper bar (5) are made of silicone.