阅读说明：本技术 一种氧化铝瓷芯棒复合绝缘子及其制作方法 (Alumina porcelain core rod composite insulator and manufacturing method thereof ) 是由 陈清春 韩江 朱凌峰 于 2019-10-18 设计创作，主要内容包括：本发明公布了一种氧化铝瓷芯棒复合绝缘子,包括氧化铝瓷芯棒以及包覆于氧化铝瓷芯棒外部的伞裙外套,所述氧化铝瓷芯棒为圆柱状,所述氧化铝瓷芯棒侧面至少设有一个凹槽；所述氧化铝瓷芯棒外侧壁设有增强部；所述增强部包括沟槽或凸起,所述沟槽或凸起在所述氧化铝瓷芯棒外表面围成网格状区域；所述网格状区域上设有若干无序排列的三角形定位块,本发明还公开了上述绝缘子的制作方法,该结构和方法的结合,使得绝缘子的弯曲强度得到增强,同时也提高了其与硅橡胶伞裙外套的粘结力。(The invention discloses an alumina porcelain core rod composite insulator which comprises an alumina porcelain core rod and an umbrella skirt outer sleeve coated outside the alumina porcelain core rod, wherein the alumina porcelain core rod is cylindrical, and the side surface of the alumina porcelain core rod is at least provided with a groove; the outer side wall of the alumina porcelain core rod is provided with a reinforcing part; the reinforcing part comprises grooves or bulges, and the grooves or the bulges surround a grid-shaped area on the outer surface of the alumina porcelain core rod; the invention also discloses a manufacturing method of the insulator, and the combination of the structure and the method enhances the bending strength of the insulator and simultaneously improves the binding force between the insulator and the outer sleeve of the silicon rubber umbrella skirt.)

1. The utility model provides an alumina porcelain plug composite insulator which characterized in that: the aluminum oxide porcelain core rod comprises an aluminum oxide porcelain core rod (100) and an umbrella skirt outer sleeve (200) coated outside the aluminum oxide porcelain core rod (100), wherein the aluminum oxide porcelain core rod (100) is cylindrical, and the side surface of the aluminum oxide porcelain core rod (100) is at least provided with a groove (101);

the outer side wall of the alumina porcelain core rod (100) is provided with a reinforcing part.

2. The alumina porcelain core rod composite insulator of claim 1, wherein: the reinforcing part comprises grooves or bulges, and the grooves or the bulges surround a grid-shaped area (102) on the outer surface of the alumina porcelain core rod.

3. The alumina porcelain core rod composite insulator of claim 1, wherein: a plurality of triangular positioning blocks (103) which are arranged in a disordered way are arranged on the grid-shaped area (102).

4. The alumina porcelain core rod composite insulator of claim 3, wherein: one included angle of the triangular positioning blocks (103) is 30-40 degrees, and each side of the adjacent triangular positioning blocks (103) is not on the same straight line.

5. The alumina porcelain core rod composite insulator of claim 4, wherein: the umbrella skirt coat (200) is made of silicon rubber, and a glaze layer is arranged on the outer surface of the alumina porcelain core rod (100);

and/or one or more through holes (104) are arranged in the middle of the side wall of the alumina porcelain core rod (100).

6. The alumina porcelain core rod composite insulator of claim 1, wherein: the material comprises the following raw materials in parts by weight: 10-30 parts of industrial alumina powder, 5-10 parts of calcined bauxite powder, 20-25 parts of feldspar, 25-35 parts of clay and 20-40 parts of calcined kaolin.

7. The manufacturing method of the alumina porcelain core rod composite insulator is characterized by comprising the following steps of: comprises the following steps:

s1: mixing the raw materials, grinding the raw materials by a wet method until the granularity of powder is less than 5 mu m, and squeezing the qualified slurry to carry out vacuum mud refining;

s2: preparing an alumina porcelain core rod green body (100) by adopting a die forming method;

s3: spraying or dipping glaze on the green body of the alumina ceramic core rod, and sintering at one time to obtain a semi-finished product of the ceramic core rod; the glaze comprises the following raw materials in parts by weight: 3-10 parts of silica sol, 1-4 parts of methylsilane, 15-25 parts of acetic acid, 75-90 parts of propanol and 10-30 parts of prefabricated flaky glass;

s4: cleaning pollutants on the surface of the semi-finished product of the porcelain core rod, and then drying; and taking out, brushing a layer of adhesive, putting into a silicone rubber injection mold, and molding with silicone rubber by adopting a vulcanization process to obtain the composite insulator.

8. The method for manufacturing the alumina porcelain core rod composite insulator according to claim 6, wherein the method comprises the following steps: the one-time sintering process comprises the steps of 0.5-1h at 25-80 ℃, 0.5-1h at 80-100 ℃, 2-3h at 100-700 ℃, 2-3h at 1000-3 h at 700-700 ℃, 2-3h at 1000-1250 ℃ and 1.5-3h at 1250-1300 ℃.

9. The method for manufacturing the alumina porcelain core rod composite insulator according to claim 6, wherein the method comprises the following steps: the processing procedure of the prefabricated scaly glass comprises the steps of soaking the scaly glass in a coupling agent solution for 3-5 hours, taking out and drying to obtain the prefabricated scaly glass; the particle size of the flaky glass is 20-100 microns.

10. The method for manufacturing the alumina porcelain core rod composite insulator according to claim 8 or 9, wherein the method comprises the following steps: the coupling agent solution comprises, by weight, 0.1-0.5 part of vinyl triacetyl silane, 1-3 parts of butadiene-based triethoxysilane, 0.05-0.1 part of vinyl silicone oil, 20-35 parts of a diluent, and 0.01-0.05 part of an active agent.

Technical Field

The invention relates to the field of insulators, in particular to an alumina porcelain core rod composite insulator and a manufacturing method thereof.

Background

The insulator comprises a main body in the middle, an umbrella skirt on the side surface of the main body and mounting parts (the mounting parts are generally hardware fittings or flanges) at two ends of the main body of the insulator; in the prior art, the insulator has two types of electric porcelain and rubber, and the electric porcelain insulator has the advantage of good ageing resistance, but has the defects of heavy weight and high cost; the rubber insulator has the advantages of light weight, but has the defects of poor aging resistance and poor bearing strength, and the prior art also has the defects that the insulator is internally provided with the resin core, but the resin core also has high cost, and the defects influence the normal use and popularization of the insulator.

However, if the glaze layer is added on the surface of the ceramic core, the mechanical strength of the ceramic core can be increased, and the ceramic core has certain hydrophobic property, but the bonding force between the silicon rubber umbrella skirt and the silicon rubber umbrella skirt is greatly reduced, so that how to improve the interface bonding force between the glaze layer of the ceramic core rod and the silicon rubber umbrella skirt becomes the key point of research.

Disclosure of Invention

In order to solve the existing problems, the invention discloses an alumina porcelain core rod composite insulator which comprises an alumina porcelain core rod and an umbrella skirt outer sleeve coated outside the alumina porcelain core rod, wherein the alumina porcelain core rod is cylindrical, and the side surface of the alumina porcelain core rod is at least provided with a groove;

and the outer side wall of the alumina porcelain core rod is provided with a reinforcing part.

Preferably, the reinforcing part comprises grooves or protrusions, and the grooves or the protrusions surround a grid-shaped area on the outer surface of the alumina porcelain core rod.

Preferably, a plurality of triangular positioning blocks which are arranged in a disordered manner are arranged on the grid-shaped area.

Preferably, one included angle of the triangular positioning blocks is 30-40 degrees, and each side of the adjacent triangular positioning blocks is not on the same straight line.

Preferably, the umbrella skirt outer sleeve is made of silicon rubber, and the outer surface of the alumina porcelain core rod is provided with a glaze layer;

and/or one or more through holes are arranged in the middle of the side wall of the alumina porcelain core rod.

Preferably, the feed comprises the following raw materials in parts by weight: 10-30 parts of industrial alumina powder, 5-10 parts of calcined bauxite powder, 20-25 parts of feldspar, 25-35 parts of clay and 20-40 parts of calcined kaolin.

The invention also discloses a manufacturing method of the alumina porcelain core rod composite insulator, which comprises the following steps:

s1: mixing the raw materials, grinding the raw materials by a wet method until the granularity of powder is less than 5 mu m, and squeezing the qualified slurry to carry out vacuum mud refining;

s2: preparing an alumina porcelain core rod green body by adopting a die forming method;

s3: spraying or dipping glaze on the green body of the alumina ceramic core rod, and sintering at one time to obtain a semi-finished product of the ceramic core rod; the glaze comprises the following raw materials in parts by weight: 3-10 parts of silica sol, 1-4 parts of methylsilane, 15-25 parts of acetic acid, 75-90 parts of propanol and 10-30 parts of prefabricated flaky glass;

s4: cleaning pollutants on the surface of the semi-finished product of the porcelain core rod, and then drying; and taking out, brushing a layer of adhesive, putting into a silicone rubber injection mold, and molding with silicone rubber by adopting a vulcanization process to obtain the composite insulator.

Preferably, the one-time firing process comprises the steps of 25-80 ℃ for 0.5-1h, 80-100 ℃ for 0.5-1h, 100-700 ℃ for 2-3h, 700-1000 ℃ for 2-3h, 1000-1250 ℃ for 2-3h and 1250-1300 ℃ for 1.5-3 h.

Preferably, the processing procedure of the scale-shaped glass is to dip the scale-shaped glass in a coupling agent solution for 3 to 5 hours, take out and dry the scale-shaped glass; the particle size of the flaky glass is 20-100 microns.

Preferably, the coupling agent solution adopts 0.1 to 0.5 portion of vinyl triacetyl silane, 1 to 3 portions of butadiene-based triethoxysilane, 0.05 to 0.1 portion of vinyl silicone oil, 20 to 35 portions of diluent and 0.01 to 0.05 portion of active agent according to the weight portion.

The invention has the beneficial effects that:

(1) according to the invention, the outer side wall of the alumina ceramic core rod is provided with the reinforcing part, the reinforcing part is a latticed area which is surrounded by the outer surface of the alumina ceramic core rod, and meanwhile, each side of the adjacent triangular positioning blocks in the latticed area is not on the same straight line, so that a network structure with a positioning area in the middle is formed, the slippage of a ceramic body and a silicon rubber contact surface in the traditional mode is prevented, and the bending performance of the alumina ceramic core rod is further improved;

(2) one or more through holes are formed in the middle of the side wall of the alumina porcelain core rod, positioning pieces can be installed in the through holes, and the combination of the umbrella skirt outside and the core rod is firmer;

(3) the prefabricated scaly glass is added into the glaze, wherein the prefabricated scaly glass is soaked in the coupling agent in advance for pretreatment, and the treatment mode is that on one hand, the scaly glass is stacked to form a fish scale structure, so that the slippage of a contact surface between a ceramic body and silicon rubber is further prevented, on the other hand, the addition of the coupling agent effectively improves the interface stress between the glaze surface and a silicon rubber substrate, the combination is firmer, and the generation of gaps after long-time use is prevented, so that the electrical performance of the insulator is influenced;

(4) the temperature adjustment of the one-time sintering process and the sectional sintering at a low temperature section are more beneficial to the removal of moisture, the excessive shrinkage of a green body can be prevented, and simultaneously, the combination between the melted scaly glass and a ceramic crystal phase is combined in a microstructure; the bonding force between the scaly glass and the ceramic core rod is stronger, so that the bending strength of the scaly glass is further improved;

(5) the combination of the arrangement of the reinforcing part and the manufacturing method improves the bending strength of the ceramic core rod and the bonding force of the silicon rubber shed outer sleeve and the alumina ceramic core rod.

Drawings

FIG. 1 is a schematic structural view of the present invention;

FIG. 2 is a schematic structural view of an alumina porcelain core rod of the present invention;

FIG. 3 is a schematic diagram of the structure of the grid-like regions of the present invention;

in the figure, 100-alumina porcelain core rod, 101-groove, 102-grid area, 103-triangular positioning block and 200-shed outer sleeve.

Detailed Description

It should be noted that the embodiments and features of the embodiments may be combined with each other without conflict.

In the description of the present invention, it is to be understood that the terms "center", "longitudinal", "lateral", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", and the like, indicate orientations or positional relationships based on those shown in the drawings, and are used only for convenience in describing the present invention and for simplicity in description, and do not indicate or imply that the referenced devices or elements must have a particular orientation, be constructed and operated in a particular orientation, and thus, are not to be construed as limiting the present invention. Furthermore, the terms "first", "second", etc. 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," "second," etc. may explicitly or implicitly include one or more of that feature. In the description of the present invention, "a plurality" means two or more unless otherwise specified.

In the description of the present invention, it should be noted that, unless otherwise explicitly specified or limited, the terms "mounted," "connected," and "connected" are to be construed broadly, e.g., as meaning either a fixed connection, a removable connection, or an integral connection; can be mechanically or electrically connected; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meaning of the above terms in the present invention can be understood by those of ordinary skill in the art through specific situations.

The following detailed description of specific embodiments of the invention refers to the accompanying drawings.

The vulcanization process adopted in the following embodiments and comparative examples is specifically positioning in a manner that the outer diameter of a hardware fitting accessory is tightly fitted with the inner diameter of a die cavity after die assembly, and uniformly extruding high-temperature silicone rubber through uniform rotation of a screw. The high-temperature silicon rubber is filled in the gaps of the die cavity and fully contacts with the ceramic core rod glaze, and hot air in the die cavity is removed through simple harmonic fluctuation of four times of die closing force, so that the high-temperature silicon rubber is completely and compactly filled in the gaps of the die cavity. Other forms of vulcanization processes may be used, and are not limited thereto.

As the binder that can be used in the present invention, a resin having good durability is used, but various binders can be selected and used according to the use and purpose. For example, SiO, for example, may be used₂Inorganic binders such as binders; a UV adhesive containing an acrylate, an oligomer, or the like, which is cured by irradiation with ultraviolet rays; acrylic binders such as MMA, MA; a silicon binder such as fluorine-modified silicon; organic-inorganic composite binders such as vinyl, epoxy, amine-based composite silicon; urethane adhesives obtained by urethanizing an acrylic having a hydroxyl group and an isocyanate, and particularly nanocrystallized inorganic adhesives.