Lifting and protecting soft sleeve for porcelain dry blank

Abstract

The utility model discloses a lifting and protecting soft sleeve for a porcelain dry blank, and belongs to the technical field of porcelain insulator manufacturing. The Shore hardness A of the lifting and protecting soft sleeve for the porcelain dry blank is 40-60. The lifting and protecting soft sleeve comprises a neck ring colloid and a holding part colloid which are coaxially arranged and integrally formed, in the axial direction, the inner diameter of the neck ring rubber body is kept consistent from the front end to the rear end; and in the axial direction, the farther the distance from the neck ring rubber body is, the larger the inner diameter of the holding part rubber body is. The dry blank lifting device not only can be used for lifting the dry blank and preventing the end head of the dry blank from being damaged, but also can be used for effectively protecting the dry blank in the glazing process and preventing glaze of different compositions from being mixed, so that the respective consistency of different glaze layers is ensured, and the product yield is improved.

Description

Technical Field

[0001] The utility model relates to a technology in the field of porcelain insulator manufacturing, in particular to a soft sleeve for lifting and protecting porcelain dry blanks. Background Art

[0002] The production of porcelain power insulators requires raw materials to be formed into dry blanks of the desired insulation structure according to relevant design and process requirements. These blanks then undergo glazing and firing to produce the porcelain components. Before glazing, the dry blanks are in a state of tendency to dry out and contain a certain amount of moisture. Handling the dry blanks at this stage, if they are subjected to improper forces, can significantly increase the risk of damage.

[0003] Production practice has revealed that when handling dry blanks for glazing, different handling positions affect handling efficiency and product yield. Gripping at the end of the tip makes it more difficult to control the gripping area, making it easy to apply excessive force to the edge of the gripping area (chamfered corners), resulting in defects. Gripping at the waist of the tip (a weaker area) increases the probability of damage.

[0004] In addition to factors such as the insulator's structural design, the composition of the dry blank's raw materials, and the manufacturing process, the ultimate performance of the porcelain component also depends on the glaze layer applied to the blank's surface. Currently, conventional porcelain insulator technology generally applies a single layer of glaze to the entire dry blank. However, for high-performance porcelain insulators used in ultra-high voltage and ultra-high voltage applications, a single, all-over glaze layer sometimes fails to meet the requirements. Research suggests that applying glazes of varying performance to different areas of the dry blank (such as the cap and end) is effective.

[0005] For the step-by-step application of glazes to obtain glaze layers with different properties on different parts, the general operation is to first apply glaze A to a portion of the dry blank, wait for it to dry before transferring it to the remaining area and applying glaze B. During the operation, if the glaze layer is applied to the current area and the other area to be glazed is not wrapped, there is a risk that the subsequent glaze area will be contaminated with glaze A. The glaze B in the subsequent glaze area will mix with glaze A, resulting in a decrease in the consistency of the glaze layer, and the subsequent porcelain performance will be lower than expected. If the protective measure of plastic wrapping is used, it will lead to reduced production efficiency.

[0006] In order to solve the above problems in the prior art, the present invention is provided. Utility Model Content

[0007] In response to the above-mentioned deficiencies in the prior art, the utility model proposes a lifting and protective soft sleeve for porcelain dry blanks, which can not only be used to lift the dry blanks to avoid damage to the end portions of the dry blanks, but also can effectively protect the dry blanks during the glazing process, avoid mixing of glazes of different compositions, ensure the consistency of different glaze layers, and improve product yield.

[0008] The utility model relates to a lifting and protective soft sleeve for porcelain dry blanks, the Shore A hardness of the lifting and protective soft sleeve for porcelain dry blanks is 40-60, comprising: a coaxially arranged and integrally formed neck ring colloid and a gripping part colloid;

[0009] In the axial direction, the inner diameter of the collar colloid remains consistent from the front end to the rear end;

[0010] In the axial direction, the farther away from the collar colloid is, the larger the inner diameter of the gripping portion colloid is.

[0011] According to some specific embodiments, in the axial direction, the farther away from the collar colloid is, the thicker the gripping portion colloid is.

[0012] For some specific embodiments, in the axial direction, the farther away from the gripping portion colloid is, the smaller the thickness of the collar colloid is.

[0013] In some specific implementation schemes, the porcelain dry blank lifting and protective soft sleeve are made of natural rubber, silicone rubber or butyl rubber.

[0014] When applied to disc-shaped suspension porcelain insulator blanks, the collar colloid is placed on the porcelain blank at a position where the tangent of the arc chamfer between the end of the porcelain blank and the umbrella extends from the starting point of the tangent toward the waist of the porcelain blank end within a range of no more than 15 mm.

[0015] When applied to the porcelain blank of a rod-shaped porcelain insulator, the collar colloid is set on the porcelain blank at the following positions: the end portions at both ends of the blank; a soft sleeve is set at the end opposite to the upper umbrella surface, extending from the starting point of the tangent of the arc chamfer of the end portion of the porcelain blank and the umbrella portion toward the waist portion of the end portion of the porcelain blank within a range not exceeding 30 mm; the other soft sleeve is arranged symmetrically with the previous soft sleeve above and below.

[0016] Compared with the prior art, the present invention has the following technical effects:

[0017] 1) The colloid in the neck ring forms a seal on the end of the porcelain blank to prevent the end of the porcelain blank from being contaminated by the glaze slurry spreading from the rod; while the colloid in the gripping part forms a shield-shaped protection for the main area of ​​the end of the porcelain blank to prevent the end of the porcelain blank from being contaminated by accidentally splashed glaze slurry;

[0018] 2) During the lifting process, the collar colloid makes uniform circumferential contact with the higher strength area of ​​the end of the porcelain blank, while a gap remains between the gripping part colloid and the waist area of ​​the end of the porcelain blank, thus avoiding direct damage and hidden extrusion damage during the lifting and turnover process. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 Schematic diagram of the cross-sectional structure of Example 1;

[0020] Figure 2 Schematic diagram of the embodiment 1 applied to the lifting and protection of the dry blank of the disc-shaped suspension porcelain insulator;

[0021] Figure 3 Schematic diagram of the method for lifting and protecting a dry blank of a rod-shaped porcelain insulator applied in Example 1;

[0022] In the figure: 100, porcelain dry blank lifting and protective soft sleeve; 101, neck ring colloid; 102, grip part colloid; 200, disc-shaped suspension porcelain insulator dry blank; 300, rod-shaped porcelain insulator dry blank. DETAILED DESCRIPTION

[0023] The present invention is described in detail below with reference to the accompanying drawings and specific implementation methods.

[0024] Example 1

[0025] like Figure 1 As shown, this embodiment relates to a lifting and protective soft sleeve for porcelain dry blanks, which is made of silicone rubber with a Shore A hardness of 40 to 60 and a certain elasticity and shrinkage capacity, ensuring the sealing of the contact parts after the product is sleeved on the porcelain dry blank, and forming a certain structural resistance during the lifting process to prevent the lifting and protective soft sleeve for porcelain dry blanks from detaching from the porcelain dry blank. The lifting and protective soft sleeve 100 for porcelain dry blanks includes a coaxially arranged and integrally formed neck ring colloid 101 and a gripping part colloid 102. The neck ring colloid is used to be sleeved on the area near the umbrella part of the end of the porcelain dry blank. In the sleeved state, the inner ring of the neck ring colloid fits the end of the porcelain dry blank and is cylindrical.

[0026] The following describes the specific structure and dimensions of the porcelain blank lifting and protective soft sleeve 100 with the collar colloid 101 as the bottom and the gripping part colloid 102 as the top.

[0027] The shape of the collar colloid 101 is an inverted convex cone. When cut arbitrarily along the central axis, a first longitudinal section is obtained. The section height is h1, the length of the lower base of the section is b1, the size of b1 is 3 to 5 mm, the length of the upper base b3 of the section is twice the length of the lower base b1, the inner surface of the section is parallel to the central axis, and the angle between the outer surface of the section and the central axis is 17°.

[0028] The gripping portion colloid 102 has an inverted convex cone shape. When cut arbitrarily along the central axis, a second longitudinal section is obtained. The length b2 of the upper base of the section is 5 times the length b3 of the lower base (i.e., the upper base of the first longitudinal section); the inner surface of the section is inclined relative to the central axis at an angle of 9° to avoid squeezing the end of the dry blank; the outer surface of the section is inclined relative to the central axis at an angle of 30° to provide an effective gripping area.

[0029] like Figure 2 As shown, Figure 1 Schematic diagram of the state of the lifting and protective soft sleeve 100 for the porcelain dry blank being installed on the end of a 550kN-class disc-shaped suspension porcelain insulator dry blank 200 for ultra-high voltage power grid, where the height h1 = 12mm; in the installed state, the collar colloid sleeve is placed on the end of the dry blank, starting from the starting point of the tangent of the arc chamfer between the end of the porcelain dry blank and the umbrella, and extending within 15mm towards the waist of the porcelain dry blank end.

[0030] like Figure 3 As shown, Figure 1 Schematic diagram of a porcelain dry blank lifting and protective soft sleeve 100 being installed on the end of a 110kV substation rod-shaped porcelain insulator dry blank 300, where the height h1 is 25mm. In the installed state, the collar colloid sleeve is placed on both ends of the dry blank. A porcelain dry blank lifting and protective soft sleeve is installed at the end opposite to the upper umbrella (at Figure 3 The middle is the upper end), starting from the starting point of the tangent of the arc chamfer between the end of the porcelain blank and the umbrella part, extending within 30mm towards the waist of the end of the porcelain blank; the sleeve position of the collar colloid at the other end is symmetrical with it.

[0031] When the umbrella part of the above-mentioned disc-shaped suspension porcelain insulator dry blanks and rod-shaped insulator dry blanks is glazed, the collar colloid forms a seal on the end of the dry blank, which can effectively prevent the end from being contaminated by the glaze in the umbrella area; the inner ring of the gripping part colloid does not contact the end of the dry blank. When the dry blank is lifted by the gripping part, the force is applied to the area with higher strength at the end of the dry blank through the collar colloid, and will not cause squeezing on other parts of the end of the dry blank with lower strength, thereby avoiding squeezing damage.

[0032] Defects (closely related to external forces) were tracked in dry blanks of 550kN disc-shaped suspension porcelain insulators for UHV power grids and rod-shaped porcelain insulators for 110kV substations. The main visible defect types found in the handling area of ​​550kN disc-shaped suspension porcelain insulators for UHV power grids were indentations, cracks, and abrasions. The main visible defect types found in the handling area of ​​110kV rod-shaped porcelain insulators were indentations and abrasions.

[0033] For porcelain insulators that require different glaze layers on the umbrella and end, if a straight-tube rubber ring is used to fit the protective area (the end that is glazed later) and then transported (operators typically hold or grip the insulator at the waist or from the waist to the end of the end), the probability of three types of defects in the dry blank of a 550kN disc-shaped suspension porcelain insulator reaches 2% to 3%; the probability of two types of defects in the dry blank of a 110kV substation rod-shaped porcelain insulator reaches 1% to 1.5%;

[0034] If a straight-tube sponge ring is used to fit the protective area before transportation, the probability of three types of defects in the dry blank of a 550kN disc-shaped suspension porcelain insulator reaches 1% to 2%; the probability of two types of defects in the dry blank of a 110kV substation rod-shaped porcelain insulator reaches 1% to 1.3%;

[0035] By using the porcelain dry blank lifting and protective soft sleeve of the present invention to be sleeved in a specific area, the probability of the above-mentioned visual defects is reduced to 0, effectively avoiding the occurrence of defects in vulnerable areas.

[0036] It should be emphasized that the above are only preferred embodiments of the present invention and do not constitute any form of limitation to the present invention. Any simple modifications, equivalent changes and modifications made to the above embodiments based on the technical essence of the present invention are still within the scope of the technical solution of the present invention.

Claims

1. A soft sleeve for lifting and protecting porcelain dry blanks, characterized in that: The Shore A hardness of the porcelain dry blank lifting and protective soft sleeve is 40 to 60, and includes: a coaxially arranged and integrally formed neck ring colloid and a gripping part colloid; In the axial direction, the inner diameter of the collar colloid remains consistent from the front end to the rear end; In the axial direction, the farther away from the collar colloid is, the larger the inner diameter of the gripping portion colloid is.

2. The soft sleeve for lifting and protecting porcelain blanks according to claim 1 is characterized in that: The porcelain dry blank lifting and protective soft sleeve are made of natural rubber, silicone rubber or butyl rubber.

3. The soft sleeve for lifting and protecting porcelain blanks according to claim 1 is characterized in that: In the axial direction, the farther away from the collar colloid is, the thicker the gripping portion colloid is.

4. The soft sleeve for lifting and protecting porcelain blanks according to claim 3 is characterized in that: In the axial direction, the farther away from the gripping portion colloid is, the smaller the thickness of the collar colloid is.

5. The soft sleeve for lifting and protecting porcelain blanks according to claim 1 is characterized in that: The thickness of the collar colloid at one end away from the gripping part colloid is 3-5 mm.

6. The soft sleeve for lifting and protecting porcelain dry blanks according to claim 5, characterized in that: The thickness of the collar colloid at one end close to the gripping portion is twice the thickness of the colloid at one end away from the gripping portion, and the angle of the outer surface relative to the central axis is 17°.

7. The soft sleeve for lifting and protecting porcelain dry blanks according to claim 6, characterized in that: The thickness of the gripping part colloid at the end away from the collar colloid is 5 times the thickness of the end close to the collar colloid, the angle of the outer surface relative to the central axis is 30°, and the angle of the inner surface relative to the central axis is 9°.

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