CN215250444U - Reversible glass ink removing basket - Google Patents

Abstract

The utility model relates to a glass that can overturn is got rid of black basket utensil. The basket comprises a fixing plate, a limiting hole, a limiting column and a fixing piece. The fixing piece clamps the limiting column at the limiting hole of the fixing plate to form a clamping station for clamping glass. Under the general working condition, a plurality of limiting columns of the basket are fixed on the fixing plate to form a clamping station with an upper opening, and the upper side surface of the glass is not clamped by the limiting columns. In another working state, the basket tool can be turned over up and down by arranging the limiting columns through the openings above the clamping stations to fix the sides of the glass. After the basket is turned over, the limiting column fixed on the side edge above the glass can be removed, so that the common working state can be recovered, the basket can be flexibly turned over up and down, and the basket is suitable for various working states. The method is applied to the ink fading process, can completely remove the ink without replacing the basket, is beneficial to simplifying the process flow of the glass fading, avoids the low yield of the glass, and is suitable for a plurality of procedures of the glass preparation process.

Description

Reversible glass ink removing basket

Technical Field

The utility model relates to a glass preparation technical field, in particular to can overturn glass and fade black basket utensil.

Background

The anti-dazzle glass is special glass with low reflectivity and high transparency, and has the name of English: the Anti-glass, called AG glass for short, has the working principle that the single side or double sides of high-quality glass are subjected to process treatment, so that the Anti-glass has lower reflectance compared with common glass. The surface of the anti-dazzle glass is concave-convex in particles, the mirror reflection is adjusted to be diffuse reflection, the interference of ambient light is reduced, a matte low-reflection surface is formed, the visual angle, the definition and the brightness of a display picture are improved, the reflection of light on a screen is reduced, the anti-dazzle effect is achieved, and meanwhile, the anti-dazzle glass has the advantages of good hand feeling, attractive appearance, dirt resistance and the like, and is particularly suitable for various displays and protective screens.

At present, the preparation of the anti-dazzle glass usually adopts a chemical frosting mode to carry out irregular micro-etching on the surface of the glass, and mainly comprises the steps of adopting anti-dazzle frosting powder to carry out micro-etching on the surface of the glass so as to form irregular anti-dazzle lattices and adopting a chemical polishing process to change anti-dazzle parameters of products. The preparation process flow of the anti-dazzle glass generally comprises the following steps: ink protection non-frosted surface → frosting treatment → removing protection ink → chemical polishing treatment → cleaning treatment. As an important process in the preparation process of the anti-dazzle glass frosting, the effect of ink fading treatment has great influence on the productivity and the product yield of the anti-dazzle glass.

The protective ink is used for screen printing on the non-processing surface of the glass for protection, and the protective ink is removed after the processing treatment is finished, so that the protective ink is a common protective means in glass processing. Generally, the ink fading process is divided into two forms of flow sheet fading and groove fading. The flow sheet type ink removing is that the flow sheet type cleaning machine removes the ink, the product is put on a conveyor belt and passes through an ink removing tunnel, and the high-temperature alkali liquor is continuously sprayed on the surface of the product when the product is in the ink removing tunnel, so that the protective ink on the surface of the product is removed. The tank type high-temperature ink fading is that the product is placed in a tank body filled with high-temperature alkali liquor, and the product is soaked in the alkali liquor, so that the protective ink on the surface of the product is faded.

For the groove type high-temperature ink fading process, a glass product is often inserted into a basket tool and soaked in high-temperature alkali liquor together with the basket tool, fading protective ink is clamped at a position in contact with the basket tool, and particularly, the side edge of the bottom of glass is firmer in contact with the basket tool and is difficult to directly clear. Therefore, before the next step of the product with the groove type high-temperature ink fading, the product needs to be transferred to another basket for fading ink, and the position where the ink is clamped and hidden at the side edge of the bottom of the glass is exposed for cleaning, so that the clamped and hidden ink is removed. The basket inserting action of transferring the product between the baskets makes the technological process of the ink fading process complicated, and also increases the risk of bad scratch or fragment of the product.

SUMMERY OF THE UTILITY MODEL

Therefore, it is necessary to provide a reversible glass ink removing basket capable of simplifying the process flow and improving the yield of products.

The utility model provides a glass that can overturn is got rid of black basket utensil, include:

the first fixing plate and the second fixing plate are respectively provided with limiting holes at different heights;

the limiting column is provided with a plurality of limiting bulges which are arranged at intervals, and a gap is formed between every two adjacent limiting bulges; and

the fixing piece is used for clamping and fixing two ends of the limiting column at the limiting holes of the first fixing plate and the second fixing plate respectively;

when the first fixing plate and the second fixing plate are connected through the limiting columns and the fixing part, clamping stations used for clamping glass on different peripheral sides of the glass can be formed among the limiting columns, and the clamping stations are separated into a plurality of sub-stations through the limiting bulges.

In some embodiments, the limiting hole is elongated.

In some embodiments, at least one of the limiting holes of each fixing plate extends along a first direction, the limiting hole is a first limiting hole, at least one of the limiting holes extends along a second direction, the limiting hole is a second limiting hole, and the first direction is perpendicular to the second direction.

In some embodiments, each fixing plate has a plurality of first limiting holes distributed at different heights of the fixing plate and arranged in parallel.

In some embodiments, the first position-limiting holes on each fixing plate have multiple groups, each group includes multiple position-limiting holes distributed at different heights of the fixing plate, and the position-limiting holes between adjacent groups are correspondingly arranged.

In some embodiments, each of the fixing plates has a plurality of second limiting holes distributed at the same height of the fixing plate and arranged in parallel.

In some of these embodiments, the shape of the limiting protrusion is a cuspid shape, a trapezoid shape or a semicircular shape.

In some of these embodiments, the shape of the limiting protrusion is a pointed tooth shape.

In some embodiments, the number of the limiting columns is at least four, and the four limiting columns are respectively used for clamping different sides of the periphery of the glass.

In some embodiments, the fixing member includes a locking screw, and the fixing member is in threaded connection with an end of the limiting column to clamp two ends of the limiting column at the limiting holes of the first fixing plate and the second fixing plate, respectively.

The reversible glass ink removing basket comprises a fixing plate, a limiting hole, a limiting column and a fixing piece. The fixing piece clamps the limiting column at the limiting hole of the fixing plate to form a clamping station for clamping glass. Under a general working state, the reversible glass ink removing basket is similar to a traditional basket (as shown in figure 3), a plurality of limiting columns are fixed on a fixing plate to form a clamping station with an upper opening, and the upper side surface of the glass is not clamped by the limiting columns. In another working state, the reversible glass ink removing basket can be provided with a limiting column through an opening above the clamping station to fix all the peripheral sides of the glass, so that the basket can be turned up and down. After the basket is turned over up and down, the limiting column fixed on the side edge above the glass can be removed, so that the common working state can be recovered, the basket can be flexibly turned over up and down, and the basket is suitable for various working states. The glass ink removing basket tool can expose the contact position of the glass and the limiting bulge of the limiting column through the vertical turning of the reversible glass ink removing basket tool without replacing the basket tool, is beneficial to simplifying the process flow of the glass ink removing, and avoids bad scratch or fragment of the glass caused by inserting the basket for many times.

Drawings

Fig. 1 is a schematic structural view of a reversible glass ink removing basket according to an embodiment of the present invention;

fig. 2 is a schematic structural view of a reversible glass ink removing basket with a limiting post according to an embodiment of the present invention;

fig. 3 is a schematic structural diagram of a basket used in a conventional ink fading process.

Detailed Description

In order to facilitate understanding of the present invention, the present invention will be described more fully hereinafter with reference to the accompanying drawings. The preferred embodiments of the present invention are shown in the drawings. The invention may, however, be embodied in many different forms and should not be construed as limited to the embodiments set forth herein. Rather, these embodiments are provided so that this disclosure will be thorough and complete. In the description of the present invention, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential", etc. indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings, and are only for convenience of description and simplification of the description, but do not indicate or imply that the device or element referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore should not be construed as limiting the present invention.

Furthermore, the terms "first", "second" and "first" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one such feature. In the description of the present invention, "a plurality" means at least two, e.g., two, three, etc., unless specifically limited otherwise.

In the present invention, unless otherwise expressly stated or limited, the terms "mounted," "connected," and "fixed" are to be construed broadly and may, for example, be fixedly connected, detachably connected, or integrally formed; can be mechanically or electrically connected; they may be directly connected or indirectly connected through intervening media, or they may be connected internally or in any other suitable relationship, unless expressly stated otherwise. The specific meaning of the above terms in the present invention can be understood according to specific situations by those skilled in the art.

It will be understood that when an element is referred to as being "secured to" another element, it can be directly on the other element or intervening elements may also be present. When an element is referred to as being "connected" to another element, it can be directly connected to the other element or intervening elements may also be present.

In the present application, unless expressly stated or limited otherwise, the first feature may be directly on or directly under the second feature or indirectly via intermediate members. Also, a first feature "on," "over," and "above" a second feature may be directly or diagonally above the second feature, or may simply indicate that the first feature is at a higher level than the second feature. A first feature being "under," "below," and "beneath" a second feature may be directly under or obliquely under the first feature, or may simply mean that the first feature is at a lesser elevation than the second feature.

Unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention belongs. The terminology used in the description of the invention herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the invention. As used herein, the term "and/or" includes any and all combinations of one or more of the associated listed items.

Referring to fig. 1 and 2, an embodiment of the present invention provides a reversible glass ink removing basket 10, including: the first fixing plate 100, the second fixing plate 200, the limiting hole 300, the limiting post 400 and the fixing member 500.

The first fixing plate 100 and the second fixing plate 200 are respectively provided at different heights thereof with stopper holes 300.

The limiting columns 400 are provided with a plurality of limiting bulges 410 which are arranged at intervals on each limiting column 400, and gaps are arranged between the adjacent limiting bulges 410.

The fixing member 500 is used to clamp and fix both ends of the stopper column 400 at the stopper holes 300 of the first fixing plate 100 and the second fixing plate 200, respectively.

After the first fixing plate 100 and the second fixing plate 200 are connected to the fixing member 500 through the plurality of limiting columns 400, a clamping station for clamping glass at different sides of the periphery of the glass can be formed between the plurality of limiting columns 400, and the clamping station is partitioned into a plurality of sub-stations by the limiting protrusions 410.

The reversible glass ink removing basket 10 includes fixing plates (i.e., a first fixing plate 100 and a second fixing plate 200, hereinafter referred to as 100 and 200), a limiting hole 300, a limiting post 400 and a fixing member 500. The fixing member 500 clamps the fixing post 400 at the fixing hole 300 of the fixing plate 100, 200 to form a clamping station for clamping glass. In a general working state, the reversible glass ink fading basket 10 is similar to the conventional basket 20 shown in fig. 3, a plurality of limiting columns 400 are fixed on the fixing plates 100 and 200 to form a clamping station with an upper opening, and the upper side surface of the glass is not clamped by the limiting columns. In another working state, the reversible glass ink removing basket 10 can be opened above the clamping station to be provided with the limiting columns 400 to fix all the peripheral sides of the glass, so that the basket can be turned up and down. After the basket is turned over up and down, the limiting column 400 fixed on the side edge above the glass can be removed to restore the common working state, so that the basket can be flexibly turned over up and down, and the basket is suitable for various working states. When the glass stripping device is applied to the ink stripping process, the contact position of the glass and the limiting bulge 410 of the limiting column 400 can be exposed through the vertical turning of the reversible glass stripping basket 10 without replacing the basket, the glass stripping process flow is facilitated to be simplified, and the phenomenon that the glass is scratched badly or broken due to the fact that the basket is inserted for multiple times is avoided.

In some embodiments, the hole 300 is elongated. Further, at least one of the limiting holes 300 of each of the fixing plates 100 and 200 extends along a first direction, the limiting hole is a first limiting hole 310, and at least one of the limiting holes extends along a second direction, the limiting hole is a second limiting hole 320, and the first direction and the second direction are perpendicular to each other. The utility model discloses in the embodiment, the first direction is the horizontal direction, and the second direction is vertical direction. The first and second limiting holes 310 and 320 allow the limiting post 400 to adjust its fixing positions in the first and second directions to accommodate glasses of different sizes.

In some embodiments, each of the fixing plates 100 and 200 has a plurality of first limiting holes 310, which are distributed at different heights of the fixing plates 100 and 200 and are arranged in parallel. The first stopper hole 310 may be selected to have a suitable height to fix the stopper post 400 according to the size of the glass.

In some embodiments, each of the fixing plates 100 and 200 has a plurality of second limiting holes 320 distributed at the same height of the fixing plates 100 and 200 and arranged in parallel. The second stopper hole 320 may be selected at a suitable position to fix the stopper post 400 according to the size of the glass.

In some embodiments, the first position-limiting holes 310 of each fixing plate 100, 200 have multiple sets, each set includes multiple position-limiting holes 310 distributed at different heights of the fixing plate 100, 200, and the position-limiting holes 310 between adjacent sets are correspondingly disposed.

In some of these embodiments, the restraint projection 410 is disposed around the restraint post 400.

In the specific example illustrated in fig. 2, there are two sets of retention bumps 410 on the retention post 400, with the two sets of retention bumps 410 facing in opposite directions. Two sets of spacing archs 410 can be respectively in order forming two centre gripping stations, and when the glass of inserting the basket in the basket utensil is more, can utilize less spacing post 400 of quantity to reach fixed glass's effect.

In some of these embodiments, the shape of the restraining protrusion 410 is a cuspid shape, a trapezoid shape, or a semicircular shape.

In some embodiments, there are at least four of the posts 400, and the four posts 400 are used to clamp different sides of the glass.

In some embodiments, the fixing member 500 includes a locking screw, and the fixing member 500 clamps both ends of the spacing post 400 at the spacing holes 300 of the first fixing plate 100 and the second fixing plate 200, respectively, by being threadedly coupled to the ends of the spacing post 400.

The utility model also provides a glass ink removing method, which uses the reversible glass ink removing basket 10, and comprises the following steps S1-S4.

Step S1: putting the glass to be deinked into the assembled reversible glass deinking basket tool, so that the glass is clamped in a clamping station formed by the limiting columns and the side edge above the glass is not clamped;

step S2: putting the turnover glass ink removing basket clamped with the glass into ink removing liquid for ink removing treatment;

step S3: after the ink removing treatment is finished, taking out the reversible glass ink removing basket from the ink removing liquid, and installing a limiting column at the side edge above the glass to clamp the side edge;

step S4: and turning the turnable glass ink removing basket tool by 180 degrees, detaching the limiting column used for clamping the side edge above the glass, and cleaning the turnable glass ink removing basket tool.

In some embodiments, the fading liquid is 5-10% sodium hydroxide solution by weight.

In some of these embodiments, the de-inking is performed at a temperature of 40 ℃ to 60 ℃.

According to the glass ink removing method, the rotatable glass ink removing basket is used, and the glass is simply turned up and down, so that the position, originally contacted with the limiting bulge 410 of the bottom limiting column 400 and used for clamping and storing ink, of the glass is turned upwards and exposed, and residual ink can be removed. By the glass ink removing method, ink of the glass panel can be completely removed without replacing the glass panel from one basket to another basket for ink removing treatment, so that the risks of poor scratch and fragment caused by basket inserting action are reduced.

The utility model also provides a preparation method of the anti-dazzle glass, which comprises the steps of silk-screen printing ink, frosting, ink fading, chemical polishing and cleaning; wherein, the ink removing step is carried out according to the glass ink removing method; and carrying out a chemical polishing step without replacing the basket after the ink fading step.

The preparation method of the anti-dazzle glass carries out ink fading by using the glass ink fading method of the reversible glass ink fading basket, and the reversible glass ink fading basket is universal in the ink fading step and the chemical polishing step, so that the process flow of the preparation of the anti-dazzle glass is simplified, and the poor scratching and fragment rate in the ink fading step are reduced.

In some of these embodiments, the step of screen printing ink is: the acid-resistant protective ink is printed on the non-anti-dazzle surface of the glass product in a screen printing mode to protect the glass product and prevent the glass product from being frosted.

In some of these embodiments, the step of frosting is: and putting the product into the AG frosting line from a feeding port, and carrying out cleaning, frosting and cleaning on the product on the frosting line and flowing out from a product discharging port.

In some of these embodiments, the step of chemically polishing is: and soaking the product and the basket after the ink removing step in a hydrofluoric acid etching tank, performing chemical polishing treatment, and taking out the basket from the etching tank after the product is etched to the target thickness.

In some of these embodiments, the step of cleaning is: and (3) putting the basket with the product subjected to the chemical polishing step into a female basket of a groove type cleaning machine, and removing dirt on the surface of the product by using a cleaning agent to ensure the surface cleanliness of the product.

The utility model discloses a turnover glass ink fading basket and application thereof are further explained below by taking frosted anti-dazzle glass as a specific embodiment.

Example 1:

example 1 an anti-glare glass was prepared by the following procedure, wherein the initial thickness of the glass was 550 μm.

And (3) screen printing ink: the acid-resistant protective ink is printed on the non-anti-dazzle surface of the product in a screen printing mode to protect the product and prevent the product from frosting.

Sanding: the product is put into the AG frosting line from the feeding port, and then flows out from the product discharging port after the product is washed before, frosted and washed after the product is washed in the line body. The frosting solution is prepared from JH-01 type frosting powder, and the frosting time is 4 min.

Ink fading step: inserting the product after the frosting into a reversible glass ink removing basket tool, soaking the basket tool with the product into an ink removing groove containing sodium hydroxide solution with the mass percentage of 10% at 50 ℃, taking out the reversible glass ink removing basket tool after 5 minutes of ink removing treatment, soaking the reversible glass ink removing basket tool into a cleaning groove, installing a rack at the upper end of the reversible glass ink removing basket tool, carrying out vertical turnover treatment on the reversible glass ink removing basket tool, removing the previous bottom rack, and soaking the reversible glass ink removing basket tool into the ink removing groove to remove residual ink.

Chemical polishing: and soaking the basket with the product subjected to the ink fading step in a hydrofluoric acid etching tank with the mass percent of 5%, performing chemical polishing treatment, and taking the product and the basket out of the etching tank after the product is etched and thinned to 60 mu m.

A cleaning step: and then placing the basket tool filled with the product subjected to the chemical polishing process into a female basket of a groove type cleaning machine, and cleaning for 30min by using a cleaning agent to remove dirt on the surface of the product.

Example 2:

the production procedure of the antiglare glass of example 2 was substantially the same as that of example 1, wherein the initial thickness of the glass was 530 μm.

Comparative example 1:

the production procedure of the antiglare glass of comparative example 1 was substantially the same as that of example 1 except that a conventional basket 20 was used in the ink-removing step, and the structure thereof was as shown in fig. 3. The glass clamping station is composed of three limiting columns fixed on the fixing frame, and the three limiting columns respectively clamp the bottom and the side edges of two sides of the glass. The ink fading method specifically comprises the following steps:

inserting the frosted product into a traditional basket tool, soaking the basket tool filled with the product into an ink removing groove containing a sodium hydroxide solution with the mass percentage of 10% at 50 ℃, taking out the basket tool after 5 minutes of ink removing treatment, soaking the basket tool into a cleaning groove, taking out the product from the basket tool, inserting the basket into another traditional basket tool, exposing the position where the ink is clamped and hidden, and soaking the basket tool into the ink removing groove to remove residual ink.

Comparative example 2:

the production procedure of the antiglare glass of comparative example 2 was substantially the same as that of example 2 except that a conventional basket was used in the ink-removing step, and the structure thereof was as shown in fig. 3.

The scratch defect rate and the breakage rate of the finished antiglare glass products prepared in examples 1 and 2 and comparative examples 1 and 2 are shown in table 1.

TABLE 1

	Thickness of glass	Number of production runs	Scratch fraction defective	Fraction of broken pieces	Residual ink
						Example 1	550μm	100 pieces	3.5％	0.3％	0.2％
Example 2	530μm	100 pieces	4％	0.3％	0.2％
						Comparative example 1	550μm	100 pieces	5％	1.0％	0.2％
Comparative example 2	530μm	100 pieces	6.5％	1.1％	0.2％

As can be seen from the data in Table 1, the ink residue of the anti-glare glasses prepared in examples 1 and 2, which were subjected to ink fading by using the reversible glass ink fading basket, was the same as that of the anti-glare glasses prepared in comparative examples 1 and 2, which were subjected to ink fading by using the conventional basket. In the step of fading ink, the anti-dazzle glass prepared by the reversible glass fading basket in the embodiments 1 and 2 has obviously lower scratch fraction defective and fragment rate than the anti-dazzle glass prepared by the traditional basket in the comparative examples 1 and 2. The initial thickness of the glass used in the example 1 is the same as that of the glass used in the comparative example 1, and the initial thickness of the glass used in the example 2 is the same as that of the glass used in the comparative example 2, and the final thickness of the prepared product is the same, and the scratching defect rate and the fragment rate are mainly influenced by the action of the insert basket in the preparation process. It can be seen that, at the same initial thickness, the scratch defect rate of example 1 is reduced by 30% and the chipping rate is reduced by 70% compared with comparative example 1. Compared with the comparative example 2, the scratch fraction defective of the example 2 is reduced by 38 percent, and the fragment rate is reduced by 72 percent. Therefore, the ink removing treatment is carried out by adopting the reversible glass ink removing basket, so that the preparation process of the anti-dazzle glass can be simplified, and the scratch reject ratio and the fragment rate of the anti-dazzle glass product can be effectively reduced.

The technical features of the embodiments described above may be arbitrarily combined, and for the sake of brevity, all possible combinations of the technical features in the embodiments described above are not described, but should be considered as being within the scope of the present specification as long as there is no contradiction between the combinations of the technical features.

The above-mentioned embodiments only represent some embodiments of the present invention, and the description thereof is specific and detailed, but not to be construed as limiting the scope of the present invention. It should be noted that, for those skilled in the art, without departing from the spirit of the present invention, several variations and modifications can be made, which are within the scope of the present invention. Therefore, the protection scope of the present invention should be subject to the appended claims.

Claims (10)

1. The utility model provides a can overturn glass ink fading basket utensil which characterized in that includes:

the first fixing plate and the second fixing plate are respectively provided with limiting holes at different heights;

the limiting column is provided with a plurality of limiting bulges which are arranged at intervals, and a gap is formed between every two adjacent limiting bulges; and

the fixing piece is used for clamping and fixing two ends of the limiting column at the limiting holes of the first fixing plate and the second fixing plate respectively;

when the first fixing plate and the second fixing plate are connected through the limiting columns and the fixing part, clamping stations used for clamping glass on different peripheral sides of the glass can be formed among the limiting columns, and the clamping stations are separated into a plurality of sub-stations through the limiting bulges.

2. The reversible glass ink stripping basket of claim 1, wherein said limiting hole is elongated.

3. The reversible glass ink stripping basket according to claim 2, wherein at least one of the limiting holes of each fixing plate extends in a first direction, the limiting hole is a first limiting hole, at least one of the limiting holes extends in a second direction, the limiting hole is a second limiting hole, and the first direction is perpendicular to the second direction.

4. The reversible glass ink stripping basket as recited in claim 3, wherein each of said fixing plates has a plurality of said first limiting holes disposed at different heights of the fixing plate and arranged in parallel.

5. The reversible glass ink stripping basket as recited in claim 4, wherein said first position-limiting holes of each fixing plate have a plurality of sets, each set comprising a plurality of position-limiting holes distributed at different heights of the fixing plate, the position-limiting holes of adjacent sets being disposed correspondingly.

6. The reversible glass ink stripping basket as recited in claim 3, wherein each of said fixing plates has a plurality of said second limiting holes disposed at the same height and in parallel.

7. The reversible glass ink stripping basket according to any one of claims 1 to 6, wherein said limiting protrusion is in the shape of a cuspid, trapezoid or semicircle.

8. The reversible glass ink stripping basket according to claim 7, wherein said limiting protrusion is in the shape of a cuspid.

9. The reversible glass ink fading basket as recited in any one of claims 1 to 6, wherein said at least four limiting posts are used for clamping different sides of the periphery of the glass.

10. The reversible glass ink fading basket according to any one of claims 1 to 6, wherein the fixing member comprises a locking screw, and the fixing member is in threaded connection with the end of the limiting column to clamp two ends of the limiting column at the limiting holes of the first fixing plate and the second fixing plate respectively.

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