A dry glazing process for electric porcelain bushings

Abstract

This invention discloses a dry glazing process for porcelain sleeving, comprising the following steps: S1, installing the porcelain sleeving blank on a positioning sleeve, the positioning sleeve passing through the inner hole of the porcelain sleeving blank, and then driving the electromagnetic sleeve to rotate through the positioning sleeve; S2, during the rotation of the blank, uniformly applying glaze to the outer surface of the blank by pouring; S3, using the centrifugal force generated by the rotation of the blank to make the glaze adhere evenly and flow smoothly, forming a uniform glaze layer; in step S1, the positioning sleeve drives the electromagnetic sleeve blank to rotate around its own axis, first rotating at a low speed of 10-15 r / min for 5-10 seconds, and then uniformly increasing to the target speed. During the rotation, the speed fluctuation value of the blank is monitored in real time. When the speed fluctuation value exceeds the preset range, the power output frequency of the rotating mechanism is adjusted synchronously. This invention achieves uniform glaze adhesion by optimizing the blank positioning and rotation method, glaze pouring parameters, and process control flow.

Description

Technical Field

[0001] This invention relates to the field of porcelain bushing manufacturing technology, specifically to a dry glazing process for porcelain bushings. Background Technology

[0002] Porcelain bushings are insulating components in power systems. The uniformity and density of their surface glaze directly determine their insulation performance, aging resistance, and service life. Currently, the glazing process for porcelain bushings is mainly divided into two categories: wet glazing and dry glazing. Wet glazing is widely used due to its simplicity, but it has many drawbacks: a large amount of glaze is wasted, and excess glaze is difficult to recycle; defects such as runs, pinholes, and cracks are prone to appear on the glaze layer of the blank, resulting in uneven glaze thickness; and the blank needs a long drying time after glazing, extending the production cycle and reducing production efficiency.

[0003] While existing dry glazing processes have addressed some of the aforementioned issues of wet glazing, they still exhibit significant shortcomings in actual production: During the positioning and rotation of the blank, the rotational speed is unstable and prone to momentary fluctuations, leading to uneven glaze adhesion; the glaze pouring parameters are not well-matched to the blank's rotational state, making real-time adjustments impossible and further impacting glaze quality; some processes lack a blank pretreatment step, allowing impurities and moisture on the blank surface to cause poor adhesion between the glaze and the blank, resulting in peeling and cracking. Furthermore, existing processes lack sufficient control over environmental parameters during the glaze leveling process, which also leads to poor glaze performance in the final product, failing to meet the high-quality requirements of high-end power equipment for electrical porcelain bushings.

[0004] Therefore, there is an urgent need for a dry glazing process for electric porcelain bushings that can overcome the above-mentioned technical defects and achieve uniform glaze, high production efficiency, and stable product quality. Summary of the Invention

[0005] The purpose of this invention is to provide a dry glazing process for porcelain bushings. By optimizing the positioning and rotation method of the blank, the glaze pouring parameters, and the process control flow, the glaze layer can be uniformly adhered, the production is highly efficient and energy-saving, and the quality of porcelain bushing products can be kept stable to meet the requirements of power systems for the use of porcelain bushings.

[0006] The above-mentioned technical objective of the present invention is achieved through the following technical solution: A dry glazing process for electrical porcelain bushings includes the following steps: S1. Install the porcelain sleeve blank on the positioning sleeve. The positioning sleeve passes through the inner hole of the porcelain sleeve blank and then drives the electromagnetic sleeve to rotate through the positioning sleeve. S2. During the rotation of the blank, the glaze is applied evenly to the outer surface of the blank by pouring. S3. The centrifugal force generated by the rotation of the blank allows the glaze to adhere evenly and flow smoothly, forming a uniform glaze layer. In step S1, the positioning sleeve drives the electromagnetic sleeve blank to rotate around its own axis. First, it rotates at a low speed of 10-15 r / min for 5-10 seconds, and then increases to the target speed at a constant speed. During the rotation, the speed fluctuation value of the blank is monitored in real time. When the speed fluctuation value exceeds the preset range, the power output frequency of the rotating mechanism is adjusted synchronously to maintain the stability of the blank speed.

[0007] In a preferred embodiment, in step S1, the rotational speed of the billet is 30-120 r / min.

[0008] In a preferred embodiment, in step S2, the glaze pouring flow rate is 5-30 L / min, and the glaze solid content is 50-75 wt%.

[0009] In a preferred embodiment, before step S1, a pretreatment step is further included: drying the billet to a moisture content ≤2% and removing dust from the surface of the billet.

[0010] In a preferred embodiment, in step S3, the glaze thickness is controlled by adjusting the rotation speed of the blank, and the target glaze thickness is 0.3-1.2 mm.

[0011] In a preferred embodiment, during step S2, the blank moves back and forth along the axial direction with the positioning sleeve during the glaze pouring process, and the moving speed is 0.1-0.5m / s.

[0012] In a preferred embodiment, in step S3, the ambient temperature during the glaze leveling process is controlled at 20-35°C, and the relative humidity is controlled at 40-70%.

[0013] In a preferred embodiment, in step S2, the glaze pouring device is positioned above the blank, and the glaze is poured onto the rotating blank surface in a curtain-like manner through an adjustable flow nozzle.

[0014] In a preferred embodiment, in step S1, during the process of the positioning sleeve driving the billet to rotate at a graded speed increase, the speed fluctuation of the billet is simultaneously predicted and controlled. The prediction and control adopts a real-time monitoring method of speed change rate, which calculates the instantaneous change rate of the billet speed in real time. When the instantaneous change rate of the speed exceeds 0.5 r / min·s, the power output frequency of the rotating mechanism is adjusted in advance, and the adjustment range is 1.2 times the corresponding speed fluctuation prediction value. At the same time, the acceleration rate of the graded speed increase is controlled in conjunction with the speed increase rate, and the acceleration rate is reduced by 0.2 r / min·s until the instantaneous change rate of the speed stabilizes within 0.5 r / min·s.

[0015] In a preferred embodiment, during the speed fluctuation prediction and control process, a speed fluctuation self-correction mechanism is simultaneously added to compare the deviation between the current speed and the preset standard speed in real time. When the deviation exceeds 0.3 r / min, the system automatically fine-tunes the power output frequency of the rotating mechanism. The fine-tuning amplitude is proportional to the speed deviation. For every 0.1 r / min increase in deviation, the power output frequency is fine-tuned by 0.05 Hz, and the buffer period of the corresponding acceleration node is extended by 0.5-1 second until the speed deviation stabilizes within 0.3 r / min.

[0016] Compared with the prior art, the present invention has the following beneficial effects: 1. High rotational stability with speed control: In step S1, a low-speed preheating and uniform speed acceleration rotation method is adopted, combined with real-time speed monitoring and power output adjustment, which effectively avoids speed fluctuations during the rotation of the blank and ensures stable blank speed, providing a basic guarantee for uniform glaze adhesion; at the same time, the target speed range of the blank is clearly defined to adapt to the glazing requirements of different specifications of electric porcelain sleeves. 2. Excellent glaze uniformity and stable product quality: By optimizing the glaze pouring flow rate and solid content, and adopting a curtain-like glazing design, combined with the axial reciprocating movement of the blank and the centrifugal leveling effect, the glaze adheres evenly to the surface of the blank, effectively avoiding defects such as sagging and uneven thickness. At the same time, by adjusting the blank rotation speed to control the glaze thickness, combined with the control of environmental parameters during the glaze leveling process, the density and adhesion of the glaze layer are further improved, ensuring stable product quality. 3. High production efficiency and low production cost: The pretreatment step of the blank removes surface impurities and excess moisture, reduces glaze defects, and lowers the rework rate; compared with wet glazing, dry glazing wastes less glaze and does not require long drying time, which greatly shortens the production cycle; the adjustable flow nozzle design can flexibly adjust the amount of glaze according to the blank size, further reducing production costs. Attached Figure Description

[0017] Figure 1 This invention relates to a process flow diagram of a dry glazing process for an electrical porcelain bushing. Detailed Implementation

[0018] The present invention will be further described in detail below with reference to the accompanying drawings.

[0019] This specific embodiment is merely an explanation of the present invention and is not intended to limit the invention. After reading this specification, those skilled in the art can make modifications to this embodiment without contributing any inventive step, but such modifications are protected by patent law as long as they are within the scope of the claims of the present invention.

[0020] Reference Figure 1The core process of the dry glazing process for electrical porcelain bushings in this embodiment mainly includes three steps: positioning and rotating the blank, glaze pouring, and glaze leveling, as detailed below: The process first requires mounting the porcelain enamel sleeve blank onto a positioning sleeve, with the positioning sleeve passing through the inner hole of the blank. The blank is then rotated via the positioning sleeve. During the rotation, glaze is applied evenly to the outer surface of the blank using a pouring method. Finally, the centrifugal force generated by the blank's rotation ensures the glaze adheres evenly and flows smoothly, forming a uniform glaze layer. Specifically, during the blank positioning and rotation stage, when the positioning sleeve drives the blank to rotate around its own axis, it must first rotate at a low speed of 10-15 r / min for 5-10 seconds, then gradually increase to the target speed. The rotation speed fluctuation must be monitored in real time. If the fluctuation exceeds a preset range, the power output frequency of the rotating mechanism is adjusted synchronously to maintain the stability of the blank's rotation speed.

[0021] The billet is coaxially positioned using a positioning sleeve. The rotational power of the positioning sleeve drives the billet to rotate synchronously. Low-speed preheating rotation allows the billet to gradually adapt to the rotational state, avoiding billet displacement or damage caused by sudden high-speed rotation. Uniform acceleration reduces the inertial impact caused by sudden changes in rotation speed. During execution, the billet is first fixed on the positioning sleeve, ensuring that the positioning sleeve fits snugly against the inner hole of the billet. The rotation mechanism is then started, causing the positioning sleeve to drive the billet to rotate at a low speed of 10-15 r / min for 5-10 seconds. Subsequently, the speed is uniformly increased to the target speed. The speed monitoring module collects the billet speed data in real time. When the speed fluctuation is detected to exceed the preset range, the control system automatically adjusts the power output frequency of the rotation mechanism to compensate for the speed deviation. This process design ensures stable rotation speed of the billet during rotation, providing a foundation for uniform glaze pouring and leveling, avoiding defects such as uneven glaze thickness and surface drips caused by speed fluctuations, while protecting the billet from damage during rotation and improving process stability.

[0022] During the blank rotation process, the blank rotation speed needs to be controlled within the range of 30-120 r / min. The rotation speed setting is matched with the glaze characteristics, blank specifications, and glaze layer thickness requirements. Lower rotation speeds can prevent the glaze from being thrown out due to excessive centrifugal force, while higher rotation speeds can ensure that the glaze flows quickly and adheres evenly. The rotation speed range of 30-120 r / min can adapt to the production needs of different specifications of electric porcelain sleeve blanks and different thicknesses of glaze layers. During execution, after the blank is preheated at low speed, the rotation speed is uniformly increased to the target value within the range of 30-120 r / min. Combined with the rotation speed monitoring and adjustment mechanism, this rotation speed is maintained stable until the glazing is completed. A reasonable rotation speed range can ensure that the glaze adheres evenly to the blank surface under the action of centrifugal force, while avoiding excessively high rotation speeds that result in an excessively thin glaze layer and excessively low rotation speeds that result in glaze accumulation. It takes into account both the uniformity and adhesion of the glaze layer, adapts to different production needs, and improves the versatility of the process.

[0023] During the glaze pouring process, the glaze pouring flow rate needs to be controlled at 5-30L / min, and the glaze solid content needs to be controlled at 50-75wt%. The glaze pouring flow rate determines the amount of glaze applied to the surface of the blank per unit time. Excessive flow rate leads to glaze accumulation, while insufficient flow rate prevents the formation of a complete glaze layer. The solid content of the glaze directly affects its fluidity and adhesion. Too low a solid content results in excessive fluidity and a thin glaze layer, while too high a solid content leads to poor fluidity and defects such as pinholes and cracks. A flow rate of 5-30 L / min and a solid content of 50-75 wt% achieve a balance between the two. During execution, the flow valve of the glazing device is adjusted according to the blank specifications and required glaze thickness to control the pouring flow rate at 5-30 L / min, while using a glaze with a solid content of 50-75 wt% to ensure the glaze is poured onto the blank surface at an appropriate speed and in a suitable manner. This process design allows the glaze to adhere evenly and sufficiently to the blank surface, avoiding glaze defects, reducing glaze waste, ensuring the density and insulation properties of the glaze layer, and laying the foundation for subsequent leveling processes.

[0024] Before the blank is positioned and rotated, it needs to be pre-treated. Specifically, the blank is dried to a moisture content of ≤2%, and the surface is dusted. Moisture on the blank surface can cause the glaze to not bond tightly with the blank, leading to problems such as glaze peeling and cracking. A moisture content of ≤2% ensures that the blank surface is dry and avoids moisture affecting glaze adhesion. Dust and impurities on the blank surface can disrupt the continuity of the glaze layer, resulting in defects such as pinholes and bubbles. Dust removal ensures that the blank surface is clean. During the process, the blank is first placed in a drying device and dried at a low temperature to reduce the moisture content to below 2%. Then, dust, impurities, and burrs on the blank surface are removed by high-pressure air blowing or brushing to ensure a smooth and clean surface. Pre-treatment can improve the bonding force between the glaze and the blank, reduce glaze defects, lower the rework rate, and ensure the smooth progress of subsequent glazing and leveling processes, thus improving the quality stability of the final product.

[0025] In the glaze leveling process, the glaze thickness can be controlled by adjusting the rotation speed of the blank. The target glaze thickness needs to be controlled between 0.3-1.2mm. The centrifugal force generated by the rotation of the blank is positively correlated with the rotation speed. The higher the rotation speed, the greater the centrifugal force, and excess glaze will be thrown out, resulting in a thinner glaze layer. The lower the rotation speed, the smaller the centrifugal force, and the more glaze accumulates, resulting in a thicker glaze layer. By adjusting the rotation speed, the glaze thickness can be controlled. The target thickness of 0.3-1.2mm can meet the insulation performance and corrosion resistance requirements of different specifications of electric porcelain bushings. During execution, after the glaze is poured, the rotation speed of the blank is finely adjusted according to the preset target glaze thickness, so that the glaze flows to the target thickness under the action of centrifugal force, while maintaining a stable rotation speed until the glaze layer is initially formed. This process design can achieve control of the glaze thickness, avoiding the impact of excessively thick or thin glaze layers on the performance of electric porcelain bushings, ensuring that the product meets relevant standards, and improving product consistency and pass rate.

[0026] During the glaze pouring process, the green body needs to move back and forth along the axial direction with the positioning sleeve, and the moving speed is controlled at 0.1-0.5 m / s. The axial reciprocating movement of the green body can ensure that the glaze is evenly coated on the entire outer surface of the green body, avoiding local glaze accumulation or leakage caused by the green body being stationary. The moving speed of 0.1-0.5 m / s can balance the uniformity of glaze pouring and production efficiency. Too fast a speed may lead to insufficient glaze in some areas, while too slow a speed will reduce production efficiency. In execution, after the glaze pouring begins, the axial moving mechanism is activated, driving the positioning sleeve and the green body to move back and forth along the axial direction at a speed of 0.1-0.5 m / s until the entire outer surface of the green body is evenly covered with glaze. This process design can eliminate the difference in glaze layer thickness at different positions of the green body along the axial direction, ensure that the glaze layer on the surface of the green body is uniform and consistent, avoid defects such as local leakage and accumulation, and at the same time take into account production efficiency, making it suitable for large-scale production.

[0027] The ambient temperature during the glaze leveling process needs to be controlled at 20-35℃, and the relative humidity needs to be controlled at 40-70%. Ambient temperature affects the fluidity and drying speed of glaze. Excessive temperature causes the glaze to dry too quickly, preventing proper leveling and leading to defects such as cracks and pinholes. Insufficient temperature reduces glaze fluidity, resulting in an uneven glaze surface. High relative humidity prolongs drying time, causing the glaze to become damp and lose adhesion. Low relative humidity causes the glaze surface to dry too quickly, preventing internal moisture from escaping and creating bubbles. A temperature of 20-35℃ and a relative humidity of 40-70% provide the optimal environment for glaze leveling. During the process, after glaze application, the green body is placed in an environment with a temperature of 20-35℃ and a relative humidity of 40-70%, maintaining stable rotation until the glaze is fully leveled and initially dried. This process design ensures thorough glaze leveling, reduces surface defects, improves the smoothness and density of the glaze layer, accelerates drying, shortens the production cycle, and guarantees the adhesion between the glaze layer and the green body.

[0028] The glaze pouring device needs to be positioned above the blank. The glaze is poured onto the rotating blank surface in a curtain-like manner through adjustable flow nozzles. Positioning the device above the blank allows gravity to facilitate the natural pouring of the glaze, reducing splashing. The curtain-like pouring creates a uniform liquid curtain covering the entire cross-section of the blank, preventing uneven glazing. The adjustable flow nozzles allow for flexible adjustment of the glaze pouring flow rate according to the blank specifications and glaze layer requirements, adapting to different production scenarios. During operation, the glaze pouring device is fixed directly above the blank, and the nozzle angle and flow rate are adjusted to create a uniform curtain of glaze that pours onto the rotating blank surface. The nozzle flow rate is fine-tuned in real-time based on the glazing progress. This process design achieves uniform and stable glaze pouring, preventing excessive or insufficient glaze application in certain areas, reducing glaze layer defects, improving glazing efficiency, and enhancing the flexibility and adaptability of the process.

[0029] During the process of the positioning sleeve driving the billet to rotate at a graded speed increase, it is necessary to simultaneously predict and control the speed fluctuation of the billet. The prediction and control adopts a real-time monitoring method of speed change rate, which calculates the instantaneous change rate of the billet speed in real time. When the instantaneous change rate of speed exceeds 0.5 r / min·s, the power output frequency of the rotating mechanism is adjusted in advance, and the adjustment range is 1.2 times the corresponding predicted speed fluctuation value. At the same time, the acceleration rate of the graded speed increase is controlled in conjunction with the adjustment, and the acceleration rate is reduced by 0.2 r / min·s until the instantaneous change rate of speed stabilizes within 0.5 r / min·s. The instantaneous rate of change of rotational speed can reflect the trend of rotational speed fluctuations in advance. When the rate of change exceeds 0.5 r / min·s, it indicates that the rotational speed is about to fluctuate significantly. Adjusting the power output frequency in advance can actively counteract the fluctuation trend. The adjustment range of 1.2 times can ensure the control effect. Reducing the acceleration rate can reduce the possibility of sudden changes in rotational speed, thus suppressing fluctuations at the source. During execution, in the process of graded acceleration of the green body, the rotational speed monitoring module collects rotational speed data in real time and calculates the instantaneous rate of change. When the rate of change exceeds 0.5 r / min·s, the control system immediately adjusts the power output frequency of the rotating mechanism in advance, with the adjustment range being 1.2 times the predicted fluctuation value. At the same time, the acceleration rate of graded acceleration is reduced by 0.2 r / min·s. Monitoring continues until the instantaneous rate of change of rotational speed stabilizes within 0.5 r / min·s. This process design can realize the early prediction and active control of rotational speed fluctuations, avoid significant fluctuations in rotational speed, further improve the stability of the green body rotation, and provide a more reliable guarantee for the uniformity of the glaze layer. Compared with passive adjustment, it can significantly reduce the impact of rotational speed fluctuations on the glaze quality.

[0030] During the prediction and control of speed fluctuations, a self-correction mechanism for speed fluctuations needs to be added simultaneously. The deviation between the current speed and the preset standard speed is compared in real time. When the deviation exceeds 0.3 r / min, the system automatically fine-tunes the power output frequency of the rotating mechanism. The fine-tuning amplitude is proportional to the speed deviation. For every 0.1 r / min increase in deviation, the power output frequency is fine-tuned by 0.05 Hz. At the same time, the buffer period of the corresponding acceleration node is extended by 0.5-1 second until the speed deviation stabilizes within 0.3 r / min. A rotational speed deviation exceeding 0.3 r / min can affect the uniformity of the glaze layer. The self-correction mechanism identifies the deviation and makes targeted fine adjustments by comparing the current rotational speed with the preset standard rotational speed in real time. The fine adjustment range, proportional to the deviation, ensures the correctness of the correction and avoids over-correction or under-correction. Extending the buffer period at the acceleration node allows sufficient time for rotational speed adjustment, ensuring rotational speed stability. During execution, while predicting and adjusting rotational speed fluctuations, the system compares the current rotational speed with the preset standard rotational speed in real time. When the deviation exceeds 0.3 r / min, it automatically fine-tunes the power output frequency according to the magnitude of the deviation. For every 0.1 r / min increase in deviation, the frequency is fine-tuned by 0.05 Hz, and the buffer period at the corresponding acceleration node is extended by 0.5-1 second, continuously correcting until the rotational speed deviation is controlled within 0.3 r / min. This process design can correct small rotational speed deviations after prediction and adjustment, forming a closed-loop control of "prediction-adjustment-correction", further improving rotational speed stability and ensuring that the body rotation is always within the preset range, minimizing the impact of rotational speed fluctuations on the glaze quality.

[0031] After the billet is fitted into the positioning sleeve, it needs to be rotated at a low speed of 5-8 r / min for 3-5 seconds under no-load. The centrifugal force generated by the rotation is used to detect the tightness of the fit between the billet and the positioning sleeve. If a gap greater than 0.1 mm is detected, the system automatically reduces the acceleration rate of subsequent stages. For every 0.05 mm gap detected, the acceleration rate is reduced by 0.2 r / min until the gap is reduced to within 0.1 mm, and then the staged acceleration is completed at the preset rate. The centrifugal force generated by the low-speed no-load rotation allows the billet to fit naturally on the positioning sleeve. If a gap exists, the billet will slightly shift under the action of centrifugal force, causing speed fluctuations. By monitoring the speed fluctuations, the size of the gap can be determined. A gap threshold of 0.1 mm ensures that there is no significant shift during billet rotation. Reducing the acceleration rate reduces the rate of increase of centrifugal force during speed increase, avoiding increased billet shaking caused by gaps. A 0.2 r / min reduction in acceleration rate for every 0.05 mm gap achieves a match between the gap and the acceleration rate. During execution, after the billet is fitted... After completion, the positioning sleeve is first controlled to rotate the blank at a speed of 5-8 r / min for 3-5 seconds under no-load. The speed monitoring module collects speed fluctuation data to determine whether the fitting gap exceeds 0.1 mm. If it does, the subsequent speed increase of the graded speed increase is reduced proportionally until the gap is reduced to within 0.1 mm, and then the speed is increased uniformly to the target speed. This process design can detect and solve the fitting gap problem between the blank and the positioning sleeve in advance, avoid blank shaking and speed fluctuation caused by the gap, ensure the coaxiality of the blank rotation, and thus ensure uniform glaze pouring and reduce glaze defects.

[0032] It should be noted that, in this document, relational terms such as "first" and "second" are used only to distinguish one entity or operation from another, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Furthermore, the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or terminal device that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such a process, method, article, or terminal device. Unless otherwise specified, an element defined by the phrase "comprising..." or "including..." does not exclude the presence of additional elements in the process, method, article, or terminal device that includes said element. Additionally, in this document, "greater than," "less than," "exceeding," etc., are understood to exclude the stated number; "above," "below," "within," etc., are understood to include the stated number.

[0033] The above description of the embodiments is provided to facilitate understanding and use of the present invention by those skilled in the art. It is obvious to those skilled in the art that various modifications can be easily made to the embodiments, and the general principles described herein can be applied to other embodiments without creative effort. Therefore, the present invention is not limited to the above embodiments. Improvements and modifications made by those skilled in the art based on the disclosure of the present invention without departing from the scope of the present invention should be within the protection scope of the present invention.

Claims

1. A dry glazing process for electrical porcelain bushings, characterized in that, Includes the following steps: S1. Install the porcelain sleeve blank on the positioning sleeve. The positioning sleeve passes through the inner hole of the porcelain sleeve blank and then drives the electromagnetic sleeve to rotate through the positioning sleeve. S2. During the rotation of the blank, the glaze is applied evenly to the outer surface of the blank by pouring. S3. The centrifugal force generated by the rotation of the blank allows the glaze to adhere evenly and flow smoothly, forming a uniform glaze layer. In step S1, the positioning sleeve drives the electromagnetic sleeve blank to rotate around its own axis. First, it rotates at a low speed of 10-15 r / min for 5-10 seconds, and then increases to the target speed at a constant speed. During the rotation, the speed fluctuation value of the blank is monitored in real time. When the speed fluctuation value exceeds the preset range, the power output frequency of the rotating mechanism is adjusted synchronously to maintain the stability of the blank speed.

2. The dry glazing process for electrical porcelain bushings according to claim 1, characterized in that, In step S1, the rotational speed of the billet is 30-120 r / min.

3. The dry glazing process for electrical porcelain bushings according to claim 1, characterized in that, In step S2, the glaze pouring flow rate is 5-30 L / min, and the glaze solid content is 50-75 wt%.

4. The dry glazing process for electrical porcelain bushings according to claim 1, characterized in that, Before step S1, the process also includes a pretreatment step for the billet: drying the billet to a moisture content of ≤2% and removing dust from the surface of the billet.

5. The dry glazing process for electrical porcelain bushings according to claim 1, characterized in that, In step S3, the glaze thickness is controlled by adjusting the rotation speed of the blank, and the target glaze thickness is 0.3-1.2 mm.

6. The dry glazing process for electrical porcelain bushings according to claim 1, characterized in that, In step S2, during the glaze pouring process, the blank moves back and forth along the axial direction with the positioning sleeve at a speed of 0.1-0.5 m / s.

7. The dry glazing process for electrical porcelain bushings according to claim 1, characterized in that, In step S3, the ambient temperature during the glaze leveling process is controlled at 20-35℃, and the relative humidity is controlled at 40-70%.

8. The dry glazing process for electrical porcelain bushings according to claim 1, characterized in that, In step S2, the glaze pouring device is set above the blank, and the glaze is poured onto the rotating blank surface in a curtain shape through the adjustable flow nozzle.

9. The dry glazing process for electrical porcelain bushings according to claim 1, characterized in that, In step S1, during the process of the positioning sleeve driving the billet to rotate at a graded speed increase, the speed fluctuation of the billet is simultaneously predicted and controlled. The prediction and control adopts a real-time monitoring method of speed change rate, which calculates the instantaneous change rate of the billet speed in real time. When the instantaneous change rate of speed exceeds 0.5 r / min·s, the power output frequency of the rotating mechanism is adjusted in advance, and the adjustment range is 1.2 times the corresponding speed fluctuation prediction value. At the same time, the acceleration rate of the graded speed increase is controlled in conjunction with the speed increase rate, and the acceleration rate is reduced by 0.2 r / min·s until the instantaneous change rate of speed stabilizes within 0.5 r / min·s.

10. The dry glazing process for electrical porcelain bushings according to claim 9, characterized in that, During the speed fluctuation prediction and control process, a speed fluctuation self-correction mechanism is added simultaneously. The deviation between the current speed and the preset standard speed is compared in real time. When the deviation exceeds 0.3 r / min, the system automatically fine-tunes the power output frequency of the rotating mechanism. The fine-tuning amplitude is proportional to the speed deviation. For every 0.1 r / min increase in deviation, the power output frequency is fine-tuned by 0.05 Hz. At the same time, the buffer period of the corresponding acceleration node is extended by 0.5-1 second until the speed deviation stabilizes within 0.3 r / min.

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